Physics CP7+8 Forces doing work and their effects
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28 Terms
Energy can be transferred when…
A force makes something move
Work done
Energy transferred by a force
The amount of energy transferred (work done) depends on…
The size of the force and how far the force has moved
Power
The rate at which energy is transferred
When energy is being transferred by forces, power…
Is also the rate of doing work
What is power measured in?
Watts
1 watt =
1 joule of work done per second
Contact forces
Forces between objects that are touching
Normal contact force
The force that surfaces exert to prevent solid objects from passing through each other
Non contact force
forces between objects that are not touching
Gravity
The force that occurs between any two objects that have mass
The gravitational forces between two objects with mass can be represented as…
Vectors (arrows with direction and magnitude)
Action-reaction forces
A pair of forces acting on different objects in opposite directions
Force field
The space around an object where it can affect other objects
Magnetic field
The space around a magnet where it can affect other objects
Examples of magnetic metals
Iron, nickel and cobalt
Electric field
The space around an object charged with static electricity
Two objects with the same charge that are close to each other produce…
A pair of forces that are equal in size and in opposite directions
Contact force examples
Friction, air resistance, normal contact
Non contact force examples
Gravity, magnetism, electrostatic
For a magnet, the force is the strongest…
At the poles of the magnet
Free body force diagram
A diagram that shows forces acting on a single object
Resultant force
The overall force on an object
To work out resultant force of forces in a straight line in the same direction…
Add them together
To work out resultant force of forces in a straight line in opposite directions…
Subtract the smaller force from the larger
To work out resultant force of forces acting at an angle…
You’d do a scale drawing
Forces at 90 example scale drawing
c
Forces at other angles example scale drawing
x
