question_answer

A wooden block slides down a rough inclined ramp, as shown in the given figure. The wooden block experiences

A)  only frictional force

B)  only magnetic force

C)  gravitational and magnetic forces

D)  frictional and gravitational forces

Correct Answer: D

Solution :

  In order to answer this question, the student must be able to recognize the various forces that act on the wooden block. Since the wooden block is not made of a magnetic material, it does not experience any magnetic force. Frictional force arises when two bodies move in contact with each other. Since the surface of the wooden block is rough, the block experiences a frictional force, as shown in the following figure. All objects having mass attract each other by a force known as the gravitational force. Therefore, the wooden block is attracted by Earth and the inclined plane. The gravitational force on the block is represented by\[{{F}_{2}}\]in the given figure. Hence, the wooden block experiences frictional and gravitational forces. The correct answer is D.