physical science spring 08 review

Forces and Motion

Forces and Motion1. Speed isa.the rate of change in positionb.a change in velocityc.a push or a pulld.change in location.

Forces and Motion1. Speed is

a.the rate of change in positionb.a change in velocityc.a push or a pulld.change in location.

Forces and Motion2. Which term indicates both speed and direction?

a.magnitudeb.displacementc.momentumd.velocity

Forces and Motion2. Which term indicates both speed and direction?

a.magnitudeb.displacementc.momentumd.velocity

Forces and Motion3. Which is the proper equation for

find the speed of an object?

a. F = MA c. v = d x tb. v = d/t d. v = t/d

Forces and Motion3. Which is the proper equation for

find the speed of an object?

a. F = MA c. v = d x tb. v = d/t d. v = t/d

Forces and Motion4. Any change in speed or direction is

referred to as?

a. acceleration

c. momentum

b. displacement

d. velocity

Forces and Motion4. Any change in speed or direction is

referred to as?

a. acceleration

c. momentum

b. displacement

d. velocity

Forces and Motion5. What is a force?

a. change in speed over time

b. the tendency to resist change in motion

c. a push or pull

d. apparent weightlessness

Forces and Motion5. What is a force?

a. change in speed over time

b. the tendency to resist change in motion

c. a push or pull

d. apparent weightlessness

Forces and Motion6. Forces that are equal in size and

opposite in direction are

a. balanced forces

b. equilateral forces

c. net forces

d. unbalanced forces

Forces and Motion6. Forces that are equal in size and

opposite in direction are

a. balanced forces

b. equilateral forces

c. net forces

d. unbalanced forces

Forces and Motion7. Which of the following will result if

balanced forces act on an object?

a. the object will accelerate

b. the object will slow down

c. the object’s velocity will not change

d. centripetal force will increase

Forces and Motion7. Which of the following will result if

balanced forces act on an object?

a. the object will accelerate

b. the object will slow down

c. the object’s velocity will not change

d. centripetal force will increase

Forces and Motion8. What is another term for an

unbalanced force, a force that is NOT equal in size or opposite in direction? a. balanced forceb. gravitational forcec. strong forced. net force

Forces and Motion8. What is another term for an

unbalanced force, a force that is NOT equal in size or opposite in direction? a. balanced forceb. gravitational forcec. strong forced. net force

Forces and Motion9. What is the result of a net force

acting on an object?

a. the object will accelerate

b. the object remain motionless

c. the object’s velocity will not change

d. inertia is greater than net forces

Forces and Motion9. What is the result of a net force

acting on an object?

a. the object will accelerate

b. the object remain motionless

c. the object’s velocity will not change

d. inertia is greater than net forces

Forces and Motion10. An objects tendency to resist

changes in motion is called ___________? a. accelerationb. frictionc. inertiad. unbalanced force

Forces and Motion10. An objects tendency to resist

changes in motion is called ___________? a. accelerationb. frictionc. inertiad. unbalanced force

Forces and MotionAn object that is only acting under the

influence of gravity is ___________

a. decelerating

b. in free fall

c. stationary

d. weightless

Forces and MotionAn object that is only acting under the

influence of gravity is ___________

a. decelerating

b. in free fall

c. stationary

d. weightless

Forces and MotionFor every force there is an equal and

opposite reaction force is

a. Newton's 1st Law of Motion

b. Newton's 2nd of Motion

c. Newton's 3rd Law of Motion

d. Newton's 4th Law of Motion

Forces and MotionFor every force there is an equal and

opposite reaction force is

a. Newton's 1st Law of Motion

b. Newton's 2nd of Motion

c. Newton's 3rd Law of Motion

d. Newton's 4th Law of Motion

Forces and MotionAn object at in motion remains in motion

unless acted upon by an unbalanced force is which of Newtons laws?a. Newton's 1st Law of Motion

b. Newton's 2nd of Motion

c. Newton's 3rd Law of Motion

d. Newton's 4th Law of Motion

Forces and MotionAn object at in motion remains in motion

unless acted upon by an unbalanced force is which of Newtons laws?a. Newton's 1st Law of Motion

b. Newton's 2nd of Motion

c. Newton's 3rd Law of Motion

d. Newton's 4th Law of Motion

Forces and MotionThe total momentum of objects before

a collision equals the total momentum after a collision is described by which law?

a. Law of Conservation of Mass

b. Law of Conservation of Momentum

c. Newtons 4th Law of Motion

Forces and MotionThe total momentum of objects before

a collision equals the total momentum after a collision is described by which law?

a. Law of Conservation of Mass

b. Law of Conservation of Momentum

c. Newtons 4th Law of Motion

Forces and MotionWhich of Newton’s laws describes the

relationship between force, mass and acceleration?a. Newton's 1st Law of Motionb. Newton's 2nd of Motionc. Newton's 3rd Law of Motiond. Newton's 4th Law of Motion

Forces and MotionWhich of Newton’s laws describes the

relationship between force, mass and acceleration?a. Newton's 1st Law of Motionb. Newton's 2nd of Motionc. Newton's 3rd Law of Motiond. Newton's 4th Law of Motion

Forces and MotionIf a projectile was fired in space it will

continue to travel at a constant velocity until it hits something or is pulled into a gravity field. Which of Newton’s Law’s does this demonstrate?a. Newton's 1st Law of Motionb. Newton's 2nd of Motionc. Newton's 3rd Law of Motion

Forces and MotionIf a projectile was fired in space it will

continue to travel at a constant velocity until it hits something or is pulled into a gravity field. Which of Newton’s Law’s does this demonstrate?a. Newton's 1st Law of Motionb. Newton's 2nd of Motionc. Newton's 3rd Law of Motion

Forces and MotionA student leans against the wall.

Neither the wall nor the student move. This is an example of which of Newton’s Laws?a. Newton's 1st Law of Motionb. Newton's 2nd of Motionc. Newton's 3rd Law of Motion

Forces and MotionA student leand against the wall.

Neither the wall nor the student move. This is an example of which of Newton’s Laws?a. Newton's 1st Law of Motionb. Newton's 2nd of Motionc. Newton's 3rd Law of Motion

Forces and MotionA player strikes a ball with a bat and

the ball changes direction and sails into the outfield. This is an example of which of Newton’s Laws?a. Newton's 1st Law of Motionb. Newton's 2nd of Motionc. Newton's 3rd Law of Motion

Forces and MotionA player strikes a ball with a bat and

the ball changes direction and sails into the outfield. This is an example of which of Newton’s Laws?a. Newton's 1st Law of Motionb. Newton's 2nd of Motionc. Newton's 3rd Law of Motion

Forces and MotionA bowling ball hits some pins. Which

is true of the momentum after the collision?a. The total momentum is lessb. The total momentum is greaterc. The total momentum is equald. None of the above

Forces and MotionA bowling ball hits some pins. Which

is true of the momentum after the collision?a. The total momentum is lessb. The total momentum is greaterc. The total momentum is equald. None of the above

Forces and MotionWhich of the following is also called

the Law of Inertia?a. Newton's 1st Law of Motionb. Newton's 2nd of Motionc. Newton's 3rd Law of Motiond. Newton’s 4th Law of Inertia

Forces and MotionWhich of the following is also called

the Law of Inertia?a. Newton's 1st Law of Motionb. Newton's 2nd of Motionc. Newton's 3rd Law of Motiond. Newton’s 4th Law of Inertia

Forces and MotionRank the following in order of

increasing inertia. a. Tennis ballb. Bowling ballc. Marbled. Wrecking ball

Forces and MotionRank the following in order of

increasing inertia. Marble -> tennis ball -> bowling ball --> wrecking ball

Forces and MotionWhat equation is related to Newton’s

Second Law?a. s = d/t

b. a = (vf – vi)/tc. F = mad. p = mv

Forces and MotionWhat equation is related to Newton’s

Second Law?a. s = d/t

b. a = (vf – vi)/tc. F = mad. p = mv

Forces and MotionAn action force of 450 N pushes on a

wall to the left, what is the reaction force?

a. 450 N upb. 225 N leftc. 225 N rightd. 450 N right

Forces and MotionAn action force of 450 N pushes on a

wall to the left, what is the reaction force?

a. 450 N upb. 225 N leftc. 225 N rightd. 450 N right

Forces and MotionThe gravitational force between two

objects depends on what two things?a. Sizeb. Distance between the objectsc. Massd. Velocitye. Momentum

Forces and MotionThe gravitational force between two

objects depends on what two things?a. Sizeb. Distance between the objectsc. Massd. Velocitye. Momentum

Forces and MotionWhat is the gravitational acceleration

constant on earth?a. 9.8 m/sb. 98 m/sc. 9.8 m/s2

d. 982 mph

Forces and MotionWhat is the gravitational acceleration

constant on earth?a. 9.8 m/sb. 98 m/sc. 9.8 m/s2

d. 982 mph

Forces and MotionMomentum depends on what two

things?a. densityb. gravityc. massd. volumee. velocity

Forces and MotionMomentum depends on what two

things?a. densityb. gravityc. massd. volumee. velocity

Forces and MotionWhich has more momentum a semi

truck traveling at 10 m/s or a small car traveling at the same speed? Why?

Forces and MotionWhich has more momentum a semi

truck traveling at 10 m/s or a small car traveling at the same speed?

A semi truck because it has more mass.

Forces and MotionDescribe the motion of an object

whose distance vs. time graph looks like this.

Forces and MotionThe object is standing still. Time is

passing but distance is not increasing.

Forces and MotionDescribe the motion of the object that

produces the graph below.

Forces and MotionMotion at a constant speed. The line is

straight so you know there is no acceleration.

Forces and MotionDescribe the motion of the object that

produces the graph below.

Forces and MotionThe object is experiencing positive

acceleration; it is speeding up.

Forces and MotionDescribe and draw the path of a dart

shot from a dart gun at earth’s surface.

Forces and MotionDescribe and draw the path of a dart

shot from a dart gun at earth’s surface.

Drop of a Bullet

Forces and MotionExplain why a hammer falls faster than

a feather in the classroom?

Drop of a Bullet

Forces and MotionExplain why a hammer falls faster than

a feather in the classroom?The feather has greater surface area

and therefore more air resistance than the hammer.

Drop of a Bullet

Forces and MotionSo why do the feather and hammer hit

the ground at the same time on the moon?

Drop of a Bullet

Forces and MotionSo why do the feather and hammer hit

the ground at the same time on the moon?

There is no air on the moon to provide the upward force of air resistance. Gravitational acceleration is constant.

Forces and MotionCalculate the average speed of a mail

truck that moves 80m in 20s.

Forces and MotionCalculate the average speed of a mail

truck that moves 80m in 20s.

v = d/t = 80 m/20 s = 4 m/s

Forces and MotionWhich is the correct equation for

calculating the acceleration of an object from its change in speed?

a. s = d/t

b. a = (vf – vi)/tc. a = F/md. p = mv

Forces and MotionWhich is the correct equation for

calculating the acceleration of an object from its change in speed?

a. s = d/t

b. a = (vf – vi)/tc. a = F/m this one is if you know mass and Force

d. p = mv

Forces and MotionMary coasts her bicycle down the

hill. At one point, she is traveling at 5.0 m/s. 10 s later, her speed is 15 m/s. What is her acceleration?

Forces and MotionMary coasts her bicycle down the

hill. At one point, she is traveling at 5.0 m/s. 10 s later, her speed is 15 m/s. What is her acceleration?

a = (vf – vi)/t = (15m/s – 5m/s) = 1 m/s2

10 s

Forces and MotionA 30 kg object accelerates at a rate of 5

m/s2. How much force was used to cause this acceleration?

Forces and MotionA 30 kg object accelerates at a rate of 5

m/s2. How much force was used to cause this acceleration?

Force = mass x accelerationF = maF = 30kg x 5 m/s2 = 150Nremember a kgm/s2 is a Newton (N).

Forces and MotionA 300 N-force accelerates an object by 6

m/s2. What is the mass of the object?

Forces and MotionA 300 N-force accelerates an object by 6

m/s2. What is the mass of the object?F = ma300N = m x 6 m/s2

300N/ 6 m/s2 = 50 kg

Forces and MotionWhat is the result if you put an object in

water that is MORE dense than water?a. it floatsb. it sinksc. it moves to the middle of the water

Drop of a Bullet

Forces and MotionWhat is the result if you put an object in

water that is MORE dense than water?a. it floatsb. it sinksc. it moves to the middle of the water

Drop of a Bullet

Forces and MotionWhat is the equation for calculating

density?

Forces and MotionWhat is the equation for calculating

density?

D = m/Vdensity = mass/volume

Forces and MotionWhat is the density of an object with a

mass of 6 g and 4 ml?

Drop of a Bullet

Forces and MotionWhat is the density of an object with a

mass of 6 g and 4 ml?

D = m/V1.5 g/ml = 6 g / 4 ml

Forces and MotionIf water has a density of 1 g/ml, will a

substance with a density of 2.4 g/ml sink or float in water? Why?

Forces and MotionIf water has a density of 1 g/ml, will a

substance with a density of 2.4 g/ml sink or float in water? Why?

The substance will sink because it is more dense than water.

Forces and MotionWhich objects will sink and which will float

in pure water (density of 1 g/mL)?a.a 6 gram object with a volume of 4 mLb.a 3 gram object with a volume of 2 mLc.a 4 gram object with a volume of 6 mLd.a 16 gram object with a vol. of 20 mL

Forces and MotionWhich objects will sink and which will float

in pure water (density of 1 g/mL)?a.a 6 gram object with a volume of 4 mL sinkb.a 3 gram object with a volume of 2 mL sinkc.a 4 gram object with a volume of 6 mL floatd.a 16 gram object with a vol. of 20 mL float

Hint: If the bottom number is bigger it floats!D = m/V