4.5.2 Work done and energy transfer (will come up) P2 Flashcards
1
Q
What does it mean if a force is said to do ‘work’
A
The force causes an object to be displaced through a distance
2
Q
Units for work done
A
Joules
3
Q
What distance must be used when calculating work done
A
The distance that is moved along the line of action of the force
4
Q
Under what circumstances is 1 joule of work done
A
When a force of 1N causes a displacement of 1M
5
Q
How many newton-metres are equivalent to 1 joule
A
1Nm=1J
6
Q
What occurs when work is done against frictional forces
A
A rise in temperature of the object
Kinetic energy is converted to heat
7
Q
Why does air resistance slow down a projectile
A
The object does work against the air resistance
Kinetic energy is converted to heat, slowing down the object
