P1.3 Energy And Work Flashcards
1
Q
What is work?
A
The energy transferred by a force
2
Q
If you lift an object with 20J of work, by how much is the object’s gravitational potential energy store increased?
A
20J
3
Q
What is the formula to calculate work done?
A
Work done (J) = force applied (N) x distance moved in the direction of the force (m)
4
Q
How much work do you need to do if you have to pull a lorry 40m and you apply a force of 2000N?
A
40 x 2000 = 80000
= 80 kJ
5
Q
Where is the work done to overcome friction usually transferred?
A
To thermal energy stores by heating
