Force, Work, Power, and Torque

Question 1

What is the definition of force?

Answer 1

Force is the intensity of an impetus, or the intensity of an input.

Question 2

What happens when force is applied to an object?

Answer 2

The tendency will be for the object to move.

Question 3

What must be present to have work, power, or torque?

Answer 3

A force has to be present to initiate the process.

Question 4

How is force measured in the English system?

Answer 4

Force is measured in pounds.

Question 5

How is force measured in the metric system?

Answer 5

Force is measured in newtons.

Question 6

What is the conversion between pounds and newtons?

Answer 6

1 pound = 4.448 newtons.

Question 7

What is work?

Answer 7

Work is done when a resistance is overcome by a force acting through a measurable distance.

Question 8

What is the relationship between force and movement in work?

Answer 8

If no distance is moved, no work has been performed.

Question 9

What units are used to measure work in the English system?

Answer 9

Work is measured in inch-pounds or foot-pounds.

Question 10

What units are used to measure work in the metric system?

Answer 10

Work is measured in joules.

Question 11

How many foot-pounds are in one joule?

Answer 11

1 joule is equal to 1.36 foot-pounds.

Question 12

Fill in the blank: The engine weighs 550 pounds, and the hoist is doing the work ______ the engine.

Answer 12

lifting

Question 13

What are the three types of friction?

Answer 13

• Starting (static) friction
• Sliding friction
• Rolling friction

Question 14

What is static friction?

Answer 14

Static friction is the force required to start a body moving.

Question 15

What is sliding friction?

Answer 15

Sliding friction is the resistance to motion offered by an object sliding over a surface.

Question 16

What is rolling friction?

Answer 16

Rolling friction is the resistance to motion for objects mounted on wheels or rollers.

Question 17

What is power?

Answer 17

Power is doing work over a period of time.

Question 18

What are the units of measure for power?

Answer 18

• Foot-pounds per minute
• Foot-pounds per second
• Inch-pounds per minute
• Inch-pounds per second

Question 19

What is the equivalent of 1 horsepower in foot-pounds per second?

Answer 19

1 horsepower = 550 foot-pounds per second.

Question 20

What is torque?

Answer 20

Torque is a force acting along a distance that creates twisting and tries to make something rotate.

Question 21

How is torque calculated?

Answer 21

Torque = force x distance.

Question 22

True or False: It takes less work to move something horizontally than vertically.

Answer 22

True.

Question 23

Horsepower =

Answer 23

Power / 550 (if in sec) 33,000 (if in min)

Question 24

Work =

Answer 24

Force X Distance

Question 25

Power =

Answer 25

Force X Distance / Time

Question 26

Torque =

Answer 26

Force X Distance