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* You push a bowling ball down the lane toward the pins. Draw force diagrams for the ball (a) just before you let it go, (b) when the ball is rolling (for two clock readings); (c) as the ball is hitting a bowling pin. (d) For each force exerted on the ball in parts (a)-(c), draw the Newton’s third law force beside the force diagram, and indicate the object on which these third law forces are exerted.
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- A car is moving forward slowly and is speeding up. A student claims that the car exerts a force on itself or that the cars engine exerts a force on the car. (a) Argue that this idea cannot be accurate and that friction exerted by the road is the propulsive force on the car. Make your evidence and reasoning as persuasive as possible. (b) Is it static or kinetic friction? Suggestions: Consider a road covered with light gravel. Consider a sharp print of the tire tread on an asphalt road, obtained by coating the tread with dust.arrow_forwardA crate is located in the center of a flatbed truck. The truck accelerates to the east and the crate moves with it, not sliding at all. What is the direction of the friction force exerted by the truck on the crate? (a) It is to the west. (b) It is to the east. (c) No friction force exists because the crate is not sliding.arrow_forwardWhich statement is correct? (a) Net force causes motion. (b) Net force causes change in motion. Explain your answer and give an example.arrow_forward
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