Name: _____________________________________ Grade 6 Date:________________________

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REVISION

BOOKLET

ScIENcE

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Chapter # 16 MACHINES

QA: Read each question and choose the best answer. Then fill in the circle next to the correct answer.

1. Dan and Paul push a box 4 meters with a force of 400 newtons. How much work did they do? a) 10 joules b) 100 joules c) 160 joules d) 1,600 joules

2. Which of the following is an example of work? a) hugging the trunk of a tree b) pulling weeds out of the garden c) pushing your feet against the floor d) pushing on a solid wall with two hands

3. A jar has two lids that are the same size. You can put one lid on by slamming down hard on it with

your fist. The other lid is a screw-top lid that turns on. Which statement below is true? a) Both lids require the same amount of work. b) Work is not done to put either lid on the jar. c) The first lid requires more work than the second lid. d) The second lid requires more work than the first lid.

4. Which of the following is a simple machine?

a) brick b) computer c) salad tongs d) bread machine

5. The support in a lever is called the a) load. b) fulcrum. c) effort force. d) central joint.

6. The amount of work a machine does is less than the amount of work put into it. Why? a) Some work is lost to friction. b) Some work comes from another energy source. c) Some work goes into the air around the system. d) Some work is lost to change the temperature of the system.

Name: _____________________________________ Grade 6 Date:________________________

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7. A screw is a modified a) lever. b) wedge. c) inclined plane. d) wheel and axle.

8. Look at the diagram below. What type of pulley is shown in the diagram below?

a) fixed pulley b) reversible pulley c) moveable pulley d) block and tackle pulley

9. How does a fixed pulley make work easier?

a) A fixed pulley reduces the effort force. b) A fixed pulley changes the direction of the force. c) A fixed pulley doubles the movement of the load. d) A fixed pulley increases the distance of the applied force.

10. On a sailboat, the triangular jibsail acts as a) a lever. b) a pulley. c) a wheel and axle. d) an inclined plane.

11. Which kind of lever has the fulcrum in the middle?

a) first-class b) third-class c) fourth-class d) second-class

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Look at the diagram below.The baseball bat is a type of simple machine. Which of the following best describes the baseball bat?

a) wedge b) inclined plane c) first-class lever d) third-class lever

12. On a sailboat, a winch cranks rope in and out. What kind of simple machine is a winch crank?

a) lever b) screw c) wedge d) wheel and axle

13. In a lever what happens if the fulcrum is close to the load?

a) Less force is needed to do work. b) More force is needed to do work. c) The amount of work that is done is less. d) The amount of work that is done is greater.

14. A child uses two inclined planes joined together at an angle to push through sand. This machine is a a) screw. b) ramp. c) wedge. d) compound machine.

QB: Write the answers to the questions on the lines.

1. People who design machines try to reduce the friction between the machine’s parts. Explain why they do this and identify two ways you can reduce friction in machines. ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

2. Identify a compound machine you use in your life. Identify at least two simple machines that are in the compound machine. __________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

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3. Explain how the formula for work relates to the scientific definition of work. ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

4. A Simple machines make work easier. Part A Name two simple machines and explain how they make work easier. Part B Provide two examples of each type of simple machine. _____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

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Chapter # 17 Changing energy forms

QA: Read each question and choose the best answer. Then fill in the circle next to the correct answer.

1. Energy stored in the bonds between atoms is a) kinetic energy b) thermal energy. c) electrical energy. d) chemical energy.

2. Which material is the best choice to use in an electrical wire? a) tin b) Glass c) rubber d) copper

3. Kinetic energy and potential energy are both types of a) solar energy. b) electrical energy. c) chemical energy. d) mechanical energy

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4. Look at the illustration below. If one light bulb burns out, what will happen to the other light bulb?

a) That light bulb will stop burning. b) That light bulb will crack and break. c) That light bulb will keep on burning. d) That light bulb will burn more brightly. 5. Look at the picture below. What kind of energy is stored in the objects shown?

a) kinetic energy b) thermal energy c) chemical energy d) mechanical energy

6. Any machine with moving parts will give off heat. Why? a) Energy is lost as the parts move. b) Energy is gained as the temperature increases. c) Friction causes electrical energy to change to thermal energy. d) Friction causes mechanical energy to change to thermal energy.

7. What causes Earth to act like a magnet? a) the shifting tectonic plates b) the lack of metals around the equator c) iron ore deposits at the North and South Pole d) the movement of hot, liquid metal inside Earth

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QB: Interpreting diagram

Look at the diagram below and fill the graphic organizer.

Fill in the blanks to show energy conversions that may be involved if you eat an apple and then use the energy for running. Start with Sun’s energy hitting a leaf of an apple tree.

Finally

First

Next

Then

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QC: Write the answers to the questions on the lines

1. Explain where your body gets chemical energy and describe one way chemical energy is transformed by your body. ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

2. Explain what an electric circuit is and name three parts of a simple circuit. ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

3. In modern homes, do you think parallel or series circuits are used? Explain your reasoning. ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

4. If you break a bar magnet in half, what happens to the magnetic domains? __________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

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Chapter # 18 Thermal and light energy

QA: Read each question and choose the best answer. Then fill in the circle next to the correct answer.

1. Which sample of water has the greatest amount of thermal energy?

a) 1 cup of water at 72°C b) 1 cup of water at 85°C c) 1/2 cup of water at 72°C d) 1/2 cup of water at 85°C

2. What is thermal energy?

a) the temperature of a substance b) the amount of motion in a substance c) the kinetic energy minus the potential energy in a substance

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d) the total amount of potential and kinetic energy in a substance

3. Which statement is true about heat movement?

a) Heat always moves from a warmer substance to a cooler one. b) Heat moves between two substances only when they are touching. c) Heat moves from substances with lower kinetic energy to substances with higher kinetic energy. d) Heat usually moves from a warmer substance to a cooler one but can also move from a cooler

substance to a warmer one.

4. What type of heat transfer causes winds?

a) radiation b) convection c) transversal d) conduction

5. Which of the following is the best description of how matter moves in a compressional wave?

a. It moves up and down in the same direction as the wave.

a. It moves back and forth in the same direction as the wave. b. It moves up and down in the opposite direction of the wave. c. It moves back and forth in the opposite direction as the wave.

6.When heat transfers between two objects by conduction

a) one object must be a liquid. b) the two objects must be touching. c) the particles in the objects change location. d) the two objects must have space between them.

7.Which part of the electromagnetic spectrum can damage skin cells?

a) radio rays b) gamma rays c) ultraviolet rays d) visible light rays

8. Look at the diagram below. How is light behaving in the diagram?

a) Light is being reversed. b) Light is being reflected. c) Light is being refracted. d) Light is being absorbed.

Name: _____________________________________ Grade 6 Date:________________________

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9.Why is a metal spoon a better heat conductor than a wooden spoon?

a) The metal spoon is made of a harder, more dense material than the wooden spoon. b) The electrons in the metal spoon are harder to move than the electrons in the wooden

spoon. c) The metal spoon has a shinier luster and smoother texture than the wooden spoon has. d) The electrons in the metal spoon move more easily than the electrons in the wooden

spoon do.

10.In a glass of lemonade, what will happen to the particles in the ice cubes as heat flows from the lemonade to the ice cubes?

a) The particles will move faster. b) The particles will move slower. c) The particles will move at the same speed. d) The particles will move slower and then faster.

11.Which color absorbs the greatest amount of light that strikes it?

a) red b) black c) white d) yellow

12.Feathers help a bird stay warm because

a) they easily transfer heat. b) they trap heat in spaces between the feathers. c) they prevent the snow from melting so quickly. d) they protect the bird because it doesn’t have a layer of fat.

13.Which type of energy transfer is part of the greenhouse effect?

a) radiation b) insulation c) convection d) conduction

14.You often see lamps placed above prepared foods in restaurants. How do these lamps help keep the food warm?

a) by radiation b) by refraction c) by convection d) by conduction

Name: _____________________________________ Grade 6 Date:________________________

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QB: Write the answers to the questions on the lines.

1. How is thermal energy different from temperature? __________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

2. Identify the kind of heat transfer that causes wind and describe how winds form. __________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

3. Why is empty space a good insulator? __________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

4. Explain how a transverse wave differs from a compressional wave. ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

5. Light can behave in three different ways when it strikes matter. Identify and describe these three ways. Then give an example of each way. ______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

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Chapter # 19 Earth, Sun and Moon

QA: Read each question and choose the best answer. Then fill in the circle next to the correct answer.

1. Which phase of the Moon is the dark phase of the Moon? a) full moon b) new moon c) waxing crescent d) waning crescent

2. Why do summer days have more hours of sunlight than winter days have? a) Earth rotates slower during the summer months. b) The tilt of Earth affects the hours of sunlight during the seasons.

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c) Earth revolves closer to the Sun during the summer than during the winter. d) The Sun generates more light and heat energy during the summer than during the winter. 3. Which object has the strongest gravitational pull?

a) Sun b) Earth c) Moon d) Mercury

4. Look at the diagram below. It shows an eclipse. Imagine you are standing in the area of Earth shown by the arrow. What will you see?

a) no eclipse b) lunar eclipse c) total solar eclipse d) partial solar eclipse

5. Look at the diagram below. How is the Moon changing in the diagram?

a) The Moon is waxing. b) The Moon is waning. c) The Moon is waxing, then waning. d) The Moon is waning, then waxing.

QB: Write the answers to the questions on the lines.

1. Explain how the particles in the Sun’s core make it possible for Earth to have life. __________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

2. Explain why the Moon appears bright at night.

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3. Explain what happens during a solar eclipse and describe the positions of the Sun, Earth, and Moon. _________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

4. Describe a safe way to view a solar eclipse. ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

5. People on Earth cannot feel Earth’s motion, but they can see its effects. Part A Explain how the motion of Earth relates to the length of a day and the number of hours of daylight. Part B Explain how the motion of Earth relates to the changing seasons through the year.

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GD LUCK !!!