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25 Cards in this Set

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What is energy

Energy is the ability to do work

When is work done

Work is done when energy is changed

When is energy used

Used when a force is applied

When is work done

Work is done whenever a force moves something

How do u calculate work

W= force × distance

What is the work done and energy transferred measured in

It is measured in joules

What does the amount of work depend on

The amount of work done depends on the size of the force and the distance an object moves

What is power

Power is a measure of how quickly work is being done

What do objects gain when their lifted up

They gain gravitational energy

What do moving objects have

They have kinetic energy

Give examples of work

Walking up stairs, lifting heavy objects

What happens to energy when work is done

It is transferred from one place yo another, from one form to another

What does W stand for in an equation

W= work done in joules

Define F

F=is the force applied in newtons,N

Define D

D=is the distance moved in the direction of the force in metres, m

Example...W=F×D

W= 10×2m = 20J

How many Newtons are in 1kg

1kg=10N

What is power

Power is the rate of doing work

What rate is it

Power is the amount of work done(at what rate)

It is work done per second

How do u calculate power

P= work done÷time taken

What is the unit for power

Measured in watts(W)

Define the following



Energy


Forcemeter


Joule


Power


Watt


Work

Energy - the ability to do work


Forcemeter - an instrument


Joule - the unit of power


Power - the rate of doing work


Watt - the unit of power


Work - that which is doing when force moves a load

What is a machine

A machine is any device for doing work

What is the use of machines

Machonesreduce he force neede to work. They make work easier

What does it allow to happen with forces

It helps a small force to overcome a large force