Progress Assessment 1 2012 KEY

# An object at rest stays at rest an object in motion

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• apiccirello
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An object at rest stays at rest, an object in motion continues in motion at constant speed in a straight line, unless acted upon by an unbalanced force. 14. You are traveling in a train and suddenly fall forward. Explain why using one of Newton’s laws of motion. 4 | P a g e 50 N 10 N

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According to Newton’s 1 st law of motion: the law of inertia. Because of your inertia you want to continue in motion. 15. What is the definition of a force? Net Force? A force is a push or a pull. Net force is the sum of all forces acting upon an object. 16. What is the net force acting on an object that moves with a constant velocity? 0 N 17. A car with a mass of 500-kg accelerates at 3 m/s 2 . Calculate the force acting on the car. Looking For Given Relationship Solution Force m=500-kg a=3 m/s 2 F=ma 1500 N 18. Sam applies a 25-N force to push a 5-kg bowling ball. Sam applies the same 25-N force to push a 2-kg kickball. Which ball accelerates faster? The 2-kg ball accelerates faster. 19. What is Newton’s 3 rd law of motion? For every action there is an equal and opposite reaction. 20. According to Newton’s 3 rd law of motion if the reaction force is Chris pushing gently on the wall, what is the reaction force? The wall pushing on Chris. 21. What is the momentum of a 200 kg motorcycle travelling at 15 m/s?
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