# Lakhmir Singh Solutions Class 8 Science Solutions for Exercise in Chapter 11 - Force and Pressure

Question 63 Exercise

a) Define the frictional force.

b) Explain why the frictional force is said to be a contact force.

a) The frictional force is defined as the force that is generated between the surfaces that slide against each other.

b) The frictional force is said to be a contact force because frictional force occurs when two surfaces come in touch with each other. Example of frictional force is walking on the road. For frictional force to act, there should be a contact between the foot and the road. Therefore, it is known as a contact force.

Video transcript
"hey kids welcome to lido q a video i am vineeth your little tutor glad to bring you this question on your screen define the frictional force this is very simple the frictional force so frictional force is defined as the force that is generated between that is generated between the surfaces that slide against each other between surfaces that slide against each other part b explain why the frictional force is said to be a contact force so the frictional force is said to be a contact force frictional force is set to be a contact force because frictional force occurs when two surfaces come in touch with each other because frictional force occurs when two surfaces come in touch with each other if you still have a doubt a comment below do like the video and subscribe to our channel i'll see you in our next video until then bye kids keep learning keep flourishing"
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