Bennett Mechanical Force and Torque Questions and Answers

Question 1

Two people are carrying a heavy log.
If the log has a uniform weight and they are holding it at the ends, but one person's end is propped on their shoulder (higher up) while the other person holds it at waist level (lower down), who is supporting more of the log's weight?

Accepted Answer

The person holding the log lower.

Answer

The person holding the log higher.

Answer

They are both supporting equal weight.

Answer

It depends on the length of the log.

Question 2

To balance the lever shown, where should a 20 lb weight be placed on the right side? (The lever is marked in equal distance units from the fulcrum).

Accepted Answer

At mark 5

Answer

At mark 2

Answer

At mark 4

Answer

At mark 10

Question 3

Which of the following actions generates the most torque to loosen a tight bolt with a wrench?

Accepted Answer

Applying force at the very end of the wrench handle.

Answer

Applying force close to the bolt.

Answer

Applying force at the middle of the wrench handle.

Answer

Applying force at a 45-degree angle to the handle.

Question 4

A pulley system is used to lift a 100 kg crate. System A has one fixed pulley. System B has one fixed and one movable pulley. Which statement is true regarding the force required to lift the crate?

Accepted Answer

System B requires less force.

Answer

System A requires less force.

Answer

Both systems require the same force.

Answer

The force depends on the rope's thickness.

Question 5

If a force of 30 Newtons is applied to a box, but the box does not move, what is the force of static friction?

Accepted Answer

Exactly 30 Newtons.

Answer

Less than 30 Newtons.

Answer

More than 30 Newtons.

Answer

Zero.

Question 6

Two gears are in mesh. Gear A has 15 teeth and is driving Gear B, which has 45 teeth. If Gear A makes 3 complete rotations, how many rotations does Gear B make?

Accepted Answer

1 rotation

Answer

3 rotations

Answer

9 rotations

Answer

1/3 of a rotation

Two people are carrying a heavy log.If the log has a uniform weight and they are holding it at the ends, but one person's end is propped on their shoulder (higher up) while the other person holds it at waist level (lower down), who is supporting more of the log's weight?

Two people are carrying a heavy log.
If the log has a uniform weight and they are holding it at the ends, but one person's end is propped on their shoulder (higher up) while the other person holds it at waist level (lower down), who is supporting more of the log's weight?