Distance time graph
On a distance time graph the gradient of the graph is equal to the speed of the object.
To find the gradient (the speed) divide the distance travelled by the time taken.
The steeper the gradient the faster the object is travelling.
If the gradient on the graph is a curved line the object is accelerating.
If the gradient is diagonal straight line the object is moving at a constant speed.
If the gradient is a horizontal straight line the object is not moving.
PHYSICS™ -Roshan Rao
Speed time graph
On a speed time graph the gradient tells u how much speed is gained every second (how fast the object is accelerating).
The gradient is equal to the acceleration.
To find the distance travelled you must find the area under the line.
If the gradient is diagonal the object has a steady (constant) acceleration.
If the gradient is a straight line the object has a steady speed.
Volume and Density
Volume: the amount of space an object takes up.
The cubic meter is the unit for volume (m^3)
Density is the amount per m^3 (meters cubed)
Density = mass/volume
Density is measured in kilograms per meter cubed (kg/m^3)
If masses are measured in grams (g) and volumes in cubic centimetres (cm^3) the unit for density is g/cm^3
1 g/m^3 = 1000kg/m^3