Ch 12 Test - 8EP Science

Terms in this set (55)

a transfer of energy when a force is applied through a distance; the product of force and distance when a force is used to make an object move

How fast work is done

Unit of measurement of Work and Energy; a unit of work equal to one newton-meter

Unit of measurement of Power

A device that makes work easier; a device that changes the amount of force exerted or the direction in which the force is exerted

a machine that does work with only one movement

A simple machine with a bar that rotates around a fixed point; a simple machine consisting of a rigid object that pivots about a fixed point

The fixed point on a lever where it rotates; the fixed point around which a lever pivots

A simple machine that is a slanted surface; a simple machine consisting of a flat surface with one end higher than the other

A simple machine made up of two different sized wheels that move together as one unit; a simple machine consisting of two circular or cylindrical objects that are fastened together and rotate about a common axis

A simple machine that is used to split or cut; a simple machine consisting of a device that is thick at one end and tapers to a thin edge at the other

A simple machine that is an inclined plane wrapped around a cylinder; a simple machine that consists of an inclined plane wrapped around a central cylinder to form a spiral

A simple machine that has a rope that fits in a wheel with a groove in it; a simple machine consisting of a grooved wheel around which is wrapped a rope, chain, or cable

Compound machine

A combination of two or more simple machines that work together; a device that combines two or more simple machines

Mechanical advantage

The number of times a machine increases the input force; the number of time the force exerted on a machine is multiplied by the machine

The force applied to a machine; the force exerted on a machine

The force applied by the machine; the force exerted on an object by a machine

The work done on a machine

The work done by a machine

The percentage of the work input that becomes work output in a machine; the percentage of the input work that is converted to output work

Actual Mechanical Advantage

the mechanical advantage that a machine provides in a real situation

Ideal Mechanical Advantage

the mechanical advantage that a machine would have without friction

two or more wheels linked together by interlocking teeth

Force x Distance

Power (formula)

Three factors that changing at least one will make work easier

1. the amount of force you exert
2. the distance over which you exert your force
3. the direction in which you exert your force

Input Work (formula)

Input Force (Fi) x Input Distance (Di)

Output Work (formula)

Output Force (Fo) x Output Distance (Do)

Mechanical Advantage (formula)

Output Force (Fo) / Input Force (Fi)

Machine's Efficiency (formula)

(Work Output / Work Input) x 100 (as a %)

Remember: No machine is ...

100% or more efficient.

Simple Machines Make Our Work Easier by (2)

1. reduces our amount of force by changing the direction of our force
2. multiplies our force

6 Types of Simple Machines

1. Lever
2. Wheel and Axle
3. Screw
4. Inclined Plane
5. Pulley
6. Wedge

1st class
2nd class
3rd class

Three parts of a Lever

Fulcrum (F)
Resistance (R)
Effort (E)

Example of the 1st class lever

Example of the 2nd class lever

Example of the 3rd class lever

Example of the wheel and axle

Example of the inclined plane

Example of the wedge

Example of the pulley

Example of the screw

jar top or wine bottle opener

Work (in work triangle)

Joule - Work Unit (in work triangle)

Force (in triangle)

Newton - Force Unit (in triangle)

Distance (in triangle)

Meters - Distance Unit (in triangle)

Joule - Work (in power triangle)

Work Unit (in power triangle)

Seconds - Time Unit (in triangle)

Time (in triangle)

Power (in triangle)

Watt - Power Unit (in triangle)

YOU MIGHT ALSO LIKE...

OTHER SETS BY THIS CREATOR

THIS SET IS OFTEN IN FOLDERS WITH...

;