When a pencil cell is released from a certain point on an inclined wooden board, it travels a distance of on floor A before it comes to rest. When the same pencil cell is released from the same point on the same inclined board, it travels a distance of on floor B before coming to rest. Which floor, A or B, offers greater friction? Give reason for your answer.
A boy runs his toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be:
Explain why, it is easier to drag a mat on floor when nobody is sitting on it but much more difficult to drag the same mat when a person is sitting on it.
