Force And Energy

Question 1

Work

Answer 1

The transfer of energy to a body by the application of a force that causes the body to move in the direction of the force.

Question 2

Power

Answer 2

A quantity that measures the rate at which work is done or energy is transformed.

Question 3

Mechanical advantage

Answer 3

A quantity that measures how much a machine multiples force or distance.

Question 4

Joule

Answer 4

Units to measure work

Question 5

Watt

Answer 5

Unit of measure for power

Question 6

Simple machines

Answer 6

One of the six basic types of machines, which are the basics for all other forms of machines.

Question 7

Compound machines

Answer 7

A machine made of more than one simple machine

Question 8

Lever

Answer 8

All levers have a ridged arm that turns around a point called the fulcrum.

Question 9

First class lever

Answer 9

Have a fulcrum located between the points of application of the input and output forces

Question 10

Second class lever

Answer 10

The fulcrum is at one end of the arm and the input force is applied to the other end.

Question 11

Third class lever

Answer 11

Multiply distance rather than force. As a result, they have mechanical advantage of less than 1.

Question 12

Pulleys

Answer 12

It has the same concept as a lever. The middle point of the pulley acts like the fulcrum.

Question 13

Block and tackle

Answer 13

Multiple pulleys put together.

Question 14

Wheel and axle

Answer 14

It is made up of a lever or a pulley (the wheel) connected to a shaft (the axle)

Question 15

Inclined plane

Answer 15

An inclined plane turns a small input force into a large output force by spreading the work out over a large distance.

Question 16

Wedge

Answer 16

A wedge is just a modified incline plane

Question 17

Screw

Answer 17

A screw is an incline plane wrapped around a cylinder

Question 18

Potential energy

Answer 18

The energy that an object has because of the position, shape, or the condition of the object

Question 19

Kinetic energy

Answer 19

The energy of a moving object due to the objects motion

Question 20

Mechanical energy

Answer 20

The amount of work an object can do because of the objects kinetic and potential energies

Question 21

Elastic potential energy

Answer 21

The energy stored in any type of stretched or compressed elastic material

Question 22

Gravitational potential energy

Answer 22

Any system of two or more objects separated by a distance

Question 23

Non mechanical energy

Answer 23

Energy that lies at the level of atoms and that does not affect motion on a large scale

Question 24

Efficiency

Answer 24

A quantity, usually expressed as a percentage, that measures the ratio of useful work output to work input

Question 25

Closed system

Answer 25

When the flow of energy into and out of a system is small enough that it can be ignored

Question 26

Open system

Answer 26

Exchange energy with the space that surrounds them

Question 27

Perpetual motion machine

Answer 27

A machine that can keep on going forever without any input of energy