Energy (Mechanical Work)
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1
Name the eight energy stores:
chemical
kinetic
gravitational
elastic
thermal
magnetic
electrostatic
nuclear
kinetic
gravitational
elastic
thermal
magnetic
electrostatic
nuclear
2
Name the four energy transfers:
mechanical working
electrical working
heating
radiation
electrical working
heating
radiation
3
What is Work?
It is the amount of energy transferred
4
What is the law of the conservation of energy?
Energy cannot be created or destroyed, only transferred
5
Efficiency equals
(useful energy output/total energy input) x 100
6
Unit of Work
Joules
7
Work done equals
force x distance moved
8
Gravitational potential energy equals
mass x gravitational field strength x height
9
GPE =
mgh
10
Kinetic energy equals
1/2 x mass x speed squared
11
KE =
1/2m(v squared)
12
GPE at top = KE at bottom
GPE is transferred into KE
13
Factors affecting thinking distance:
tiredness
drugs
alcohol
distractions
drugs
alcohol
distractions
14
Factors affecting braking distance:
quality of brakes
quality of tyres
weather conditions (icy or wet roads)
road quality
mass of vehicle
quality of tyres
weather conditions (icy or wet roads)
road quality
mass of vehicle
15
Stopping distance equals
thinking distance + braking distance
16
What is Power?
The rate at which something does work
17
What is Power measured in?
Watts
18
Power equals
Work done/time taken
Energy transferred/time taken
Energy transferred/time taken
19
Mass
the amount of matter in an object
20
Weight
the measure of the force of gravity on an object
21
Weight equals
mass x gravitational field strength
22
Hooke's Law
The extension is directly proportional to the force
23
Does a metal spring follow Hooke's Law?
Yes
24
Does an elastic band follow Hooke's Law?
No
25
Pressure equals
Force/Area
26
Pressure difference equals
height x density x gravitational field strength
27
Density equals
mass/volume
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