P3 - Work and power Flashcards
1
Q
What is work?
A
Work is done when a force moves.
2
Q
What does the amount of work done depend on?
A
- size of the force acting on an object in newtons
- distance the object is moved in meters
3
Q
What is the formula for work?
A
Work done = force x distance moved
4
Q
What is work measured in?
A
Work is measured in joules (J).
5
Q
How much work is done when a person lifts a box weighing 250N off the floor to a shelf 2m high.
A
Work done = force x distance
250 x 2 = 500J
6
Q
What is weight?
A
Weight is the force of attraction on a mass.
7
Q
What is the formula for weight?
A
Weight = mass x gravity.
8
Q
What is power measured in?
A
Power is measured in watts (W).
9
Q
What is fuel consumption?
A
Fuel consumption is the distance travelled by a certain amount of fuel.
10
Q
What is the formula for power?
A
Power = work done/time taken
