Juan's teacher gives him three objects of equal volume and shape, but of different material, and asks him to drop them from his shoulder height and watch the fall time to the ground, from each of them. Juan observes that the three take different times to reach the ground, Even though all three are subjected to the same gravitational acceleration. Taking into account the above information, which of the following questions can be answered from the observations made by Juan? A. Does the falling time of objects depend on the launch height? B. Is the gravitational force proportional to the mass of the objects? C. Is the net force acting on each of the objects different?

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.