Force, Work, Power, and Torque Flashcards
What is the definition of force?
Force is the intensity of an impetus, or the intensity of an input.
What happens when force is applied to an object?
The tendency will be for the object to move.
What must be present to have work, power, or torque?
A force has to be present to initiate the process.
How is force measured in the English system?
Force is measured in pounds.
How is force measured in the metric system?
Force is measured in newtons.
What is the conversion between pounds and newtons?
1 pound = 4.448 newtons.
What is work?
Work is done when a resistance is overcome by a force acting through a measurable distance.
What is the relationship between force and movement in work?
If no distance is moved, no work has been performed.
What units are used to measure work in the English system?
Work is measured in inch-pounds or foot-pounds.
What units are used to measure work in the metric system?
Work is measured in joules.
How many foot-pounds are in one joule?
1 joule is equal to 1.36 foot-pounds.
Fill in the blank: The engine weighs 550 pounds, and the hoist is doing the work ______ the engine.
lifting
What are the three types of friction?
- Starting (static) friction
- Sliding friction
- Rolling friction
What is static friction?
Static friction is the force required to start a body moving.
What is sliding friction?
Sliding friction is the resistance to motion offered by an object sliding over a surface.
What is rolling friction?
Rolling friction is the resistance to motion for objects mounted on wheels or rollers.
What is power?
Power is doing work over a period of time.
What are the units of measure for power?
- Foot-pounds per minute
- Foot-pounds per second
- Inch-pounds per minute
- Inch-pounds per second
What is the equivalent of 1 horsepower in foot-pounds per second?
1 horsepower = 550 foot-pounds per second.
What is torque?
Torque is a force acting along a distance that creates twisting and tries to make something rotate.
How is torque calculated?
Torque = force x distance.
True or False: It takes less work to move something horizontally than vertically.
True.
Horsepower =
Power / 550 (if in sec) 33,000 (if in min)
Work =
Force X Distance
Power =
Force X Distance / Time
Torque =
Force X Distance
