PHYSICS
ws05

# ws05 - Worksheet 5 Force and Newtons Laws Questions 1 A...

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Worksheet 5: Force and Newton’s Laws Questions 1. A puck is acted on by a force (a) Since the force is vertical, it will not affect the horizontal velocity of the puck; it will only add a vertical component to the velocity. The puck will move towards the upper-right corner of the page. (b) The final speed will be greater, because the horizontal velocity didn’t change, but a vertical component to the velocity was added. (c) Since the surface is frictionless, there are no additional forces acting on the puck, so its velocity will stay the same. 2. A Lazy Horse The force exerted on the cart by the horse is indeed equal to the force exerted on the horse by the cart. However, the horse is forgetting to take into account the force of the ground on it as a reaction to him pushing backwards on it with its hoof. This force due to the ground causes a net force on the horse + cart system, which causes them to move forward.

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