1. WELCOME! THE TOPIC FOR TODAY IS…

2. Newton’s 2 nd & 3 rd Laws Test Review Cannons & Cannonball s Net ForceAction / Reaction Yes/ NoMath 200 400 600 800 1000 Final Jeopardy…what is your wager?

3. Topic 1: 200 Question: Picture a cannon launching a cannonball. The cannon pushes the cannon ball and the cannonball pushes the cannon. The cannon is much more massive than the cannonball; the cannon is resting on a frictionless surface.  Which has the larger force, the cannonball or the cannon? Answer Neither – they experience the same force!

4. Topic 1: 400 Question: Picture a cannon launching a cannonball. The cannon pushes the cannon ball and the cannonball pushes the cannon. The cannon is much more massive than the cannonball; the cannon is resting on a frictionless surface.  Which has the larger acceleration, the cannonball or the cannon? Answer Cannonball (it has the smaller mass)

5. Topic 1: 600 Question: Picture a cannon launching a cannonball. The cannon pushes the cannon ball and the cannonball pushes the cannon. The cannon is much more massive than the cannonball; the cannon is resting on a frictionless surface.  How would the directions in which they moved compare ( same direction / opposite directions? ) Answer Opposite

6. Topic 1: 800 Question: Picture a cannon launching a cannonball. The cannon pushes the cannon ball and the cannonball pushes the cannon. The cannonball is EQUAL IN MASS to the cannon. The cannon is resting on a frictionless surface  Which has the larger force, the cannonball or the cannon? Answer Neither – they experience the same force!

7. Topic 1: 1000 Question: Picture a cannon launching a cannonball. The cannon pushes the cannon ball and the cannonball pushes the cannon. The cannonball is EQUAL IN MASS to the cannon. The cannon is resting on a frictionless surface  Which has the larger acceleration, the cannonball or the cannon? Answer Neither – they experience the same acceleration!

8. Topic 2: 200 Question: A 20-N force and a 40-N force act on an object in the same direction. What is the net force on the object? Answer 60 N

9. Topic 2: 400 Question: A 20-N force and a 40-N force act on an object in opposite directions. What is the net force on the object? Answer 20 N

10. Topic 2: 600 Question: A 15 kg object is rolling toward you at 1 m/s. Another 15 kg object is rolling toward you at 5 m/s. Which object has the greater inertia? Answer Same inertia

11. Topic 2: 800 Question: A 15 kg object is rolling toward you at 10 m/s. A 20 kg object is rolling toward you at 1 m/s. Which object has the greater inertia? Answer The 20 kg object

12. Topic 2: 1000 Question: A car has a mass of 1000 kg and accelerates at 2 m/s 2. What is the magnitude of the net force acting on the car? Answer 2000 N

13. Topic 3: 200 Question: Forces occur in…____ Answer Pairs

14. Topic 3: 400 Question: As a ball falls, the action force is the pull of the earth's mass on the ball. What is the reaction to this force? Answer Pull of ball’s mass on Earth

15. Topic 3: 600 Question: An unfortunate bug splatters against the windshield of a moving car. Compared to the negative acceleration of the car, the negative acceleration of the bug is __________. (larger, smaller, the same, or zero) Answer Larger

16. Topic 3: 800 Question: An unfortunate bug splatters against the windshield of a moving car. Compared to the force of the car on the bug, the force of the bug on the car is __________ (larger, smaller, the same or zero). Answer Same!

17. Topic 3: 1000 Question: A person is attracted towards the center of the earth by a 500-N gravitational force. The force with which the earth is attracted toward the person is __________. (more than 500 N, less than 500 N, 500 N, or zero) Answer 500 N

18. Topic 4: 200 Question: Can an action force exist WITHOUT a reaction force? Answer No

19. Topic 4: 400 Question: If an object is at rest, is the net force on it 0 N? Answer Yes

20. Topic 4: 600 Question: Is it possible for a moving object to have a net force of zero, but still have forces acting on it? Answer Yes

21. Topic 4: 800 Question: An object is moving. It has a constant velocity. Is it accelerating? Answer No

22. Topic 4: 1000 Question: An object is moving. It has a constant velocity. Is the net force on it 0 N? Answer Yes

23. Topic 5: 200 Question: Calculate the NET FORCE on box A Answer 5 N

24. Topic 5: 400 Question: Calculate the acceleration on box A Answer 1 m/s 2

25. Topic 5: 600 Question: Calculate the acceleration on box B Answer ½ or 0.5 m/s 2

26. Topic 5: 800 Question: Calculate the acceleration on Box D Answer ½ or 0.5 m/s 2

27. Topic 5: 1000 Question: A crate has a mass of 10kg. You personally pull with a force of 10N, but the force of friction is 4N. What is the acceleration of the crate? Answer 0.6 m/s 2

28. Bonus Question: 5000 pts. Question: A crate has a mass of 10kg. You personally pull with a force of 10N, but the force of friction is 4N. Suppose the crate is already moving at 1m/s how fast will it be moving after you have pulled it for 10 seconds? Answer 7 m/s