Energy Flashcards
1
Q
Imagine pushing a car along a road
A
You must apply a force
And you push the car a certain distance
2
Q
Work Done
A
Work done (J) = force (n) x distance (metres)
3
Q
Energy transfer
A
As you push the car, you transfer energy from your body to : the car - increasing its kinetic energy The surroundings (and bits of the car) heat up because of friction
4
Q
The amount of work you do =
A
The amount of work you do = The amount of energy transferred
5
Q
Power =
A
Power =Work done / time taken
6
Q
One watt
A
Is one joule per second
7
Q
Method of power and workdone experiment
A
- Measure vertical step
- Count number of steps
- Weigh yourself
- Time yourself running up stairs
8
Q
Power and work done
A
Power = workdone/time = (force x distance) / time
9
Q
Kinetic energy =
A
Kinetic energy (J) = 1/2 x
2
mass x velocity
10
Q
Time =
A
Time = 1/ frequency
11
Q
Power measured in
A
Watts (w)
12
Q
Mass measured in
A
Kg
13
Q
Frequency measured in
A
Hz
14
Q
Distance measured in
A
Metres
15
Q
Time period
A
Seconds
