Force and Work Flashcards
1
Q
What is force?
A
Force is something that causes an object to accelerate
2
Q
What is weight?
A
The weight of an object is the force of gravity on it
3
Q
What is friction?
A
Friction is a force which opposes motion between two objects in contact
4
Q
Give 3 advantages and 3 disadvantages of friction
A
Advantages;
- To stop or slow things down with brakes
- To allow car tyres to move, for us to walk
- To pick things up
Disadvantages;
- Slows things down
- Wastes energy
- Wears away surfaces
5
Q
What is Hooke’s Law?
A
The extension of a spring is directly proportional to the force that is stretching it
6
Q
How do you calculate work done?
A
Force X distance moved
7
Q
What is energy?
A
The ability to do work
8
Q
What is power and how is it calculated?
A
Work done per unit time
Time taken
