CheckpointCheckpointQuiz 1 – Quiz 1 – ForcesForces

Physics UnitPhysics Unit

Ms. BrowneMs. Browne

Check PointCheck Point

1.1. What is a force?What is a force?

2.2. To describe a force both the _______________ To describe a force both the _______________ and the ________________ are needed. and the ________________ are needed.

3.3. Unbalanced forces occur when . . .Unbalanced forces occur when . . .

4.4. Balanced forces are ______________ in size Balanced forces are ______________ in size and ________________ in direction. and ________________ in direction.

5.5. _______________ forces do not cause a change _______________ forces do not cause a change in an objects motion. in an objects motion.

6. The _________________ of an object is the amount of 6. The _________________ of an object is the amount of gravity pulling on it. gravity pulling on it.

7. Look at the diagram below and answer the question 7. Look at the diagram below and answer the question that follow:that follow:

a. What is the net force acting on the box? a. What is the net force acting on the box? ________________

b. What is the effect of the forces on the box? b. What is the effect of the forces on the box?

10 N

3 N

9 N

8. The Gravity is the force of ___________________ between 8. The Gravity is the force of ___________________ between objects in the universe. objects in the universe.

9. What is Universal gravitation? Who came up with it?9. What is Universal gravitation? Who came up with it?

10. If the mass of an object increases, gravity will 10. If the mass of an object increases, gravity will _______________. An object with less mass will have _______________. An object with less mass will have _______________ gravity than an object with greater _______________ gravity than an object with greater mass. mass.

11. As the distance between objects increases, the gravity 11. As the distance between objects increases, the gravity will _____________________. will _____________________.

12. Force is measured using the SI unit _________________. 12. Force is measured using the SI unit _________________.

13. What is the difference between mass and 13. What is the difference between mass and weight?weight?

Answer KeyAnswer Key

1.1. A push or pullA push or pull

2.2. size and directionsize and direction

3.3. Motion is changed – speeding up, slowing Motion is changed – speeding up, slowing down, or changing directiondown, or changing direction

4.4. Equal and opposite Equal and opposite

5.5. BalancedBalanced

6. Weight6. Weight

7. Look at the diagram below and answer the question 7. Look at the diagram below and answer the question that follow:that follow:

a. 2 Na. 2 N

b. Moves to the left with a force of 2Nb. Moves to the left with a force of 2N

10 N

3 N

9 N

8. attraction8. attraction

9. States that all objects in the universe are attracted to 9. States that all objects in the universe are attracted to each other. Sir Isaac Newtoneach other. Sir Isaac Newton

10. Increase 10. Increase Less Less

11. Decrease11. Decrease

12. Forces / newtons (N)12. Forces / newtons (N)

13. Mass is the amount of matter in an object, while 13. Mass is the amount of matter in an object, while weight is a measure of the pull of gravity. That is why weight is a measure of the pull of gravity. That is why your WEIGHT changes on the moon, but NOT your your WEIGHT changes on the moon, but NOT your MASS. MASS.