1. What is the cause of friction? In what direction does friction act with respect to the motion of sliding object?
2. If the force of friction acting on a sliding crate is 100N, how much force must be applied to maintain a constant velocity? What will be the net force acting on the crate? WHat will be the acceleration?
3. If an object has no acceleration can you conclue that no forces are being exerted on it? (fill in the blank in the answer sentence) It can't be said that no forces are being exerted, but you can say that no ________ is acting on the object.
4. Why does a sharp knife cut better than a dull knife? (fill in the blank in the answer sentence) A smaller cutting area produces a __________ for a given force
5. Two smooth balls of exactly the same size, one made of wood and the other of iron, are dropped from a high building to the ground below. The ball encounter the greater force of air resistance on the way down is the wooden ball, iron ball, same
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