5.2 - work done and energy transfers 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
What distance must be used when calculating work
done?
A
It must be the distance that is moved
along the line of action of the force.
3
Q
Under what circumstance is 1 joule of work done?
A
When a force of 1 Newton causes a
displacement of 1 metre.
4
Q
What occurs when work is done against
frictional forces?
A
● A rise in temperature of the object
occurs
● Kinetic energy is converted to heat
5
Q
Why does air resistance slow down a projectile?
A
● The object does work against the air
resistance
● Kinetic energy is converted in to heat,
slowing down the object
