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Welcome! The Topic For Today Is…

Welcome! The Topic For Today Is…. Newton’s 2 nd & 3 rd Laws Test Review. Topic 1: 200. Question:

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Welcome! The Topic For Today Is…

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  1. Welcome! The Topic For Today Is…

  2. Newton’s 2nd & 3rd Laws Test Review

  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! Back

  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) Back

  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 Back

  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! Back

  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! Back

  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 Back

  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 Back

  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 Back

  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 Back

  12. Topic 2: 1000 • Question: • A car has a mass of 1000 kg and accelerates at 2 m/s2. What is the magnitude of the net force acting on the car? • Answer • 2000 N Back

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

  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 Back

  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 Back

  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! Back

  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 Back

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

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

  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 Back

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

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

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

  24. Topic 5: 400 Question: Calculate the acceleration on box A Answer 1 m/s2 Back

  25. Topic 5: 600 Question: Calculate the acceleration on box B Answer ½ or 0.5 m/s2 Back

  26. Topic 5: 800 Question: Calculate the acceleration on Box D Answer ½ or 0.5 m/s2 Back

  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/s2 Back

  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 Back

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