Question

13. Friction is affected by which of the following?

A. The material used to construct the road.
B. Road-surface conditions, including factors due to weather.
C. The weight of your vehicle.
D. All of the above.

Answer 1

Friction is influenced by the materials involved, surface conditions, and the weight of the object; thus, answer D, 'All of the above,' is correct. Friction opposes the relative motion between surfaces, and can be desirable, such as with tires that provide better grip on icy roads.

Step-by-step explanation:

Friction is affected by all of the following:

• The material used to construct the road.
• Road-surface conditions, including factors due to weather.
• The weight of your vehicle.

Therefore, the correct answer is D. All of the above. Friction is an external force that opposes the relative motion of objects in contact with each other. It arises partly due to the roughness of the contacting surfaces and also due to attractive forces between the molecules of the two surfaces. Examples of situations where more friction is desirable include the use of tires with better grip on icy roads. Friction varies from surface to surface because different substances have different levels of roughness or smoothness. Substances with more roughness generally create more friction than smoother ones, but even surfaces that appear smooth can experience significant frictional forces due to molecular attractions.