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Starter Questions: Force and Motion 1. 2. 3. 4. 5. 6. What is force? What is mass? What is acceleration? What units apply to make a Newton? What is the formula to calculate force? To which of Newton’s Laws does this formula apply? 7. Give an example of Newton’s First Law (The Law of Inertia) 8. What will have more force, a football player tackling at 10 m/s or a car hitting a wall at 10 m/s? Calculate the following problems. Show ALL your work!!! 1. It takes a force of 3000 N to accelerate an empty 1000 kg car at 3 meters per second square. If a160 kg wrestler is inside the car, how much force will be needed to produce the same acceleration? 2. A 63 kg skater pushes off from a wall with a force of 300 N. What is the skater’s acceleration? 3. A weightlifter raises a 440 kg barbell with an acceleration of 2 meters per second square. How much force does the weightlifter exert on the barbell? 4. A book falls from the balcony of a 12th floor apartment. It smashes on the ground 2.5 seconds later. How fast is it moving just before it hits? Momentum: The Law of Conservation of Momentum states that the total amount of momentum of a group of objects does not change unless outside forces act on the objects. 1. A boater tries to jump a few feet from a boat to land. Instead, he lands in the water. Explain why. (Think about newton’s 3rd law) 2. Compare the momentums of a 50 kg dolphin swimming 16.4 meters per second and a 6300 kg elephant walking 0.11 meters per second.