Bennett Mechanical Test Bennett Mechanical Friction and Inclined Planes Questions and Answers 3

Question 1

When an object slides down a frictionless inclined plane, which energy transformation occurs?

Accepted Answer

Gravitational potential to kinetic

Answer

As the object descends, its height decreases, converting gravitational potential energy into kinetic energy.

Question 2

A 300 N effort is used to push a 600 N box up an incline. What is the mechanical advantage?

Accepted Answer

2

Answer

Mechanical advantage = load / effort = 600 / 300 = 2.

Question 3

On an inclined plane, the normal force is always perpendicular to which surface or direction?

Accepted Answer

The surface of the incline

Answer

By definition, the normal force acts perpendicular (at 90°) to the surface the object rests on.

Question 4

Which surface combination would have the HIGHEST coefficient of friction?

Accepted Answer

Rubber on dry concrete

Answer

Rubber on dry concrete has one of the highest friction coefficients (~0.7–0.8), enabling vehicle braking.

Question 5

As a box is pushed UP a slope, in which direction does the friction force act?

Accepted Answer

Down the slope

Answer

Friction always opposes motion; since the box moves up, kinetic friction acts down the slope.

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