Work Done and Energy Transfer Flashcards
1
Q
What does it mean if a force is said to do ‘work’?
A
the force causes the object to be displaced through a distance
2
Q
What is the equation for work done?
A
force x distance
3
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
4
Q
Under what circumstance is 1 joule of work done?
A
when a force of 1 Newton causes a displacement of 1 metre
5
Q
How many Newton-metres are equal to 1 joule of energy?
A
1
6
Q
How much work is done by a force of 10N acting on a object over 5 metres?
A
10 x 5 = 50
50 J
7
Q
What occurs when work is done against frictional forces?
A
- a rise in temperature of the object
- kinetic energy is converted to heat
8
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 the object down
