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# P4 Revision

### 21st Century Science P4 revision

Speed is .... The distance travelled in a certain time.
The formula for speed is Distance / Time
the axis in a distance speed graph are... Time on the x axis and Distance up the y axis.
Speed can be calculated by calculating the gradient of the graph horitontal / vertical
In a distance speed graph the flat sections are .... where the object is stopped
In a distance time graph the steeper the slope... the faster the object is going
In a distance time graph the downhill section means.. the objct is coming back towards you.
When talking about distance time graphs distances can be.... positive or negative.
Speed is just a number but.. velocity has direction too
in a velocity time graph gradient represents.... acceleration
in a velocity time graph flat sections represent... constant speed
in a velocity time graph the steeper the slope... The greater the acceleration
In a velocity time graph uphill sections indicate... acceleration
in a velocity time graph downhill sections indicate.. deceleration
in a velocity time graph the area under the graph is equal to... the distance travelled in that time interval.
Forces occur when...... two objects interact
If you push against a wall, the wall... pushes back
Moving objects normally.... experience Friction
Resultant force is... the overall force acting on an object.
The formula for Momentum is mass x velocity
The formula for change of momentum is.. Resultant force x time for which the force acts
change in energy is the same as.. Work done
The formula for work done is Force x Distance
The formula for kinetic energy is half x mass x velocity squared
The formula for change in gravitational potential energy is Weight x change in height
Falling objects convert gravitational potential energy into Kinetic energy
Created by: garethphillips3