2. 8 th Science Force, Motion, and Energy

3. A:B: ForceWeight C:D: AccelerationAir resistance #1 A push or pull.

4. A. Force

5. A:B: AccelerationAir resistance C:D: FrictionInertia 2 #2 What is a change in motion? (Speeding up, slowing down, changing direction). Example: An airplane slows down at a rate of 3 m/s

6. A. Acceleration

7. A:B: Air resistanceInertia C:D: ForceNewton #3 A measure of an object’s tendency to remain at rest or to keep moving with a constant velocity.

8. B. Inertia

9. A:B: One of the forces is stronger than the other Both forces are equal C:D: Unbalanced forces cancel each other out, so there is no change Force #4 Forces occur in pairs and each pair of forces can be either balanced or unbalanced. How can an unbalanced force change the speed or direction of an object in motion?

10. A. One of the forces is stronger than the other

11. A:B: Law 1 – Law of InertiaLaw 2 – Law of Acceleration C:D: Law 3 – Law of Action and Reaction Law 4 – Law of Conservation #5 An object a rest remains at rest and an object in motion remains in motion at a constant speed unless acted upon by a unbalanced force. Ex: Rocket at rest on a launch pad Ex: Golf ball sitting on a tee

12. A.Law 1 – Law of Inertia

13. A:B: Law 1 – Law of InertiaLaw 2 – Law of Acceleration C:D: Law 3 – Law of Action and Reaction Law 4 – Law of Conservation #6 An object acted on by an unbalanced force will accelerate in the direction of the force. *(More force is required to move more mass.) Ex: It takes more force to move a car than a bicycle

14. B. Law 2 – Law of Acceleration

15. A:B: Law 1 – Law of InertiaLaw 2 – Law of Acceleration C:D: Law 3 – Law of Action and Reaction Law 4 – Law of Conservation #7 Every action has an equal and opposite reaction. Ex: Rocket launching. Ex: Bouncing a basketball

16. C. Law 3 – Law of Action and Reaction

17. A:B: F = 180 kgF = 180 N #8 Measure Force What force is needed to make a 36 kg object accelerate to 5 m/s ? Force = mass x acceleration C:D: F = 108 NF = 180 m/s 2 2

18. B. F = 180 N

19. A:B: There is no force or gravity There is no friction or gravity C:D: There is no friction or newton There is no weight or mass #9 Why can a spacecraft travel in space at a constant speed and in a straight path?

20. B. There is no friction or gravity

21. A:B: Box will move to the left 6N Box will move to the right 6 N C:D: The force is balanced None of these #10 Calculating net force. What would be the net force in this diagram? 16N – 10N = 6N

22. A. Box will move to the left 6N

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