Bennett Mechanical Test Force and Torque 3

Question 1

A door is hardest to open when you push:

Accepted Answer

Near the hinges

Answer

Pushing near the hinges gives a tiny lever arm, requiring far more force to produce the same torque.

Question 2

Two equal and opposite forces acting on a wheel at its edges create a:

Accepted Answer

Couple producing rotation

Answer

A couple is two equal opposite forces that produce pure rotation without net linear force.

Question 3

A 100 N force pushes a crate but it does not move. The opposing force from friction must be:

Accepted Answer

100 N

Answer

Since the crate stays still, friction exactly balances the applied force at 100 N.

Question 4

Increasing the force on a wrench while keeping the handle length fixed will:

Accepted Answer

Increase the torque

Answer

Torque grows directly with applied force when the lever arm stays constant.

Question 5

A nut needs 24 N·m of torque to turn. Using a 0.3 m wrench, what minimum force is needed?

Accepted Answer

80 N

Answer

Force equals torque divided by length, so 24 ÷ 0.3 = 80 N.

Bennett Mechanical Test Practice Test