NCERT 8th Class (CBSE) Science: Force and Pressure

Question: What is the contact force?

Answer: Force which comes in action when object are in contact.

Question: What is the muscular force.

Answer: Force resulting due to action of muscles.

Question: Give an example of muscular force?

Answer: Bending, moving and kicking etc.

Question: What kind of force is the muscular force?

Answer: Contact force.

Question: What is friction?

Answer: force acting equal and opposite to the moving object is friction.

Question: What kind of force is the friction?

Answer: Contact force.

Question: Give example of friction force.

Answer: Stopping of a rolling ball.

Question: Which force stop the moving striker on a carom board?

Answer: Friction.

Question: Why does the soal of our shoes get torn away by walking?

Answer: Due to friction between soal and road.

Question: What are non contact force?

Answer: Force acting from distance without forming contact.