ASVAB Practice Test

Is it true that frictional forces

1. Always enhance motion

2. Only operate in vertical directions

3. Reduce with increased surface area

4. Vary with the type of material

The correct answer is: Always enhance motion

Frictional forces, also known as opposing forces, act in the opposite direction of motion and can either hinder or increase motion. Option A is the correct answer because frictional forces typically slow down or impede motion. Option B is incorrect because frictional forces can occur in both vertical and horizontal directions, depending on the setup and circumstances. Option C is incorrect because frictional forces actually increase with increased surface area, as more surfaces come into contact and create more opportunities for friction to occur. Option D is also incorrect because frictional forces do not vary significantly with the type of material, but instead depend on factors such as the roughness of the surfaces and the amount of force applied.