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

Question 1

Which type of friction acts on a stationary object that is being pushed but has not yet moved?

Accepted Answer

Static friction

Answer

Static friction resists the initiation of motion between surfaces that are not moving relative to each other.

Question 2

A 100 N block slides on a surface with a coefficient of kinetic friction of 0.3. What is the friction force?

Accepted Answer

30 N

Answer

Friction force = μk × Normal force = 0.3 × 100 = 30 N.

Question 3

What is the mechanical advantage of a frictionless inclined plane that is 10 m long and 2 m high?

Accepted Answer

5

Answer

Mechanical advantage of an inclined plane = length / height = 10 / 2 = 5.

Question 4

Compared to sliding (kinetic) friction, rolling friction between the same surfaces is generally:

Accepted Answer

Less

Answer

Rolling friction is significantly less than sliding friction because contact area and deformation are reduced.

Question 5

On a 30° inclined plane, what is the component of a 200 N weight acting parallel to the slope?

Accepted Answer

100 N

Answer

Parallel component = mg sin30° = 200 × 0.5 = 100 N.

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