1. Checkpoint Quiz 1 – Forces Physics Unit Ms. Browne

3. Check Point 1.What is a force? 2. To describe a force both the _______________ and the ________________ are needed. 3.Unbalanced forces occur when... 4.Balanced forces are ______________ in size and ________________ in direction. 5._______________ forces do not cause a change in an objects motion.

5. 6. The _________________ of an object is the amount of gravity pulling on it. 7. Look at the diagram below and answer the question that follow: a. What is the net force acting on the box? ________ b. What is the effect of the forces on the box? 10 N 3 N 9 N

7. 8. The Gravity is the force of ___________________ between objects in the universe. 9. What is Universal gravitation? Who came up with it? 10. If the mass of an object increases, gravity will _______________. An object with less mass will have _______________ gravity than an object with greater mass. 11. As the distance between objects increases, the gravity will _____________________. 12. Force is measured using the SI unit _________________.

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

11. Answer Key 1.A push or pull 2. size and direction 3.Motion is changed – speeding up, slowing down, or changing direction 4.Equal and opposite 5.Balanced

13. 6. Weight 7. Look at the diagram below and answer the question that follow: a. 2 N b. Moves to the left with a force of 2N 10 N 3 N 9 N

14. 8. attraction 9. States that all objects in the universe are attracted to each other. Sir Isaac Newton 10. Increase Less 11. Decrease 12. Forces / newtons (N)

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