Density – Mass / Volume

Density of water = 1000 kg/m3

Speed – the distance travelled by an object per unit time

Speed - Distance / Time

Distance = area under speed time graph

Area of | rectangle : WxH | triangle : ½ bh

Speed = gradient of distance time graph

Acceleration – the rate of change of an object’s velocity

Acceleration = v-u/t

Acceleration = gradient of speed time graph

Forces :

i. They can be represented by arrows

ii. A force can make an object change speed

iii. A force can change the direction in which the object is moving

The resultant force is the single force that has the same effect as two or more forces

The acceleration caused by the pull of earth’s gravity is called acceleration of free fall ( 10 m/s2 )

Weight = mass x acceleration of free fall / W = mg

The mass of an object is measured in kilograms, tells you how much matter it is composed of.

The weight of an object is measured in Newtons, is the gravitational force that acts on it.

When parachutist stops accelerating, they fall at a steady rate called terminal velocity

The greater the mass of an object, the smaller the acceleration it is given by a particular force.

Force – the action of on body on a second body which causes its velocity to change.

Force = mass x acceleration , F = ma

Impulse – Ft = mv-mu

Momentum – the quantity of mass x velocity

Impulse equation ; impulse of force = change of momentum

The principle of the conservation of momentum - total momentum before = total momentum after

Vector quantities – have both magnitude and direction ( ie; velocity, force, weight )

Scalar quantities – only has magnitude ( ie; speed, mass, energy, density )

Moment – the quantity that tells us the turning effect of a force about a pivot

The moment of a force is bigger if :

i. The force is bigger

ii. It acts further from the pivot

iii. It acts at 90° the object it acts on

Moment of a force – the turning effect of a force about a point ( force x perpendicular...