P2.2.8 - Work, Energy and Machines Flashcards
1
Q
What is ‘work’ in physics?
A
Work is a method of transferring energy by using forces e.g. working against gravity or friction.
2
Q
When you lift a book what type of work are you doing?
A
You are working against gravity.
3
Q
When you slide a book along a table, what type of work are you doing?
A
You are working against friction.
4
Q
What is the equation for calculating work done?
A
Work done (J) = Force (N) x Distance moved (m)
5
Q
What is the function of a ‘simple machine’?
A
To make it easier to lift, move or turn things by reducing the force needed to do the work.
6
Q
Give 2 examples of ‘simple machines’ used to make work easier.
A
Levers for lifting
Gears for turning
7
Q
A small force acting over a big distace produces a ____________
A
Big force
