What is Newton’s first law?

An object will continue moving in the same direction and speed until an external force acts upon it.

What is Newton’s second law?

A larger force is required to push a larger mass. The acceleration is dependent on the amount of force applied.

What is Newton’s third law?

Every action has an equal or opposite reaction.

What the formula for weight?

Weight(N) = mass(Kg) x acceleration due to gravity(9.81)

What is the value of acceleration due to gravity?

9.81

What is the formula for momentum?

Momentum(kgm/s) = mass (kg) x velocity (m/s)

What is the formula for force?

Force (N) = mass x acceleration fma

m/s

how to work out total distance?

X = v{2}-u{2}/2a x = total distance a = acceleration

What is stopping distance equal to?

Stopping distance = thinking distance + braking distance

What do the safety features in modern cars aim to do?

Absorb energy(crumple zones, slightly stretchy seatbelts)

reduce injuries

reduce the momentum to zero slowly, to reduce injuries

What does the area under a speed time graph represent?

Distance

What is the equation for acceleration?

(V-u)/time

How do u calculate deceleration

Do the same as you would for acceleration and put a minus in front of the answer

Energy efficiency equation

Useful energy output/total energy input X 100

What is the name of he force which pushes back against the weight of an object

Lift

How do you work out the moment of something?

force x perpendicular distance to the direction of force

How to find the missing force on a lever (sea saw thing)

- label one side 1 and the other 2
- show force 1 x distance1 = force 2 x distance 2
- therefore force 1 (the unknown one) must equal force 2 x distance 2 divided by distance 1

HOw do you work out the number of rotations (Gears)

driven/driver

When will a body move in a circular motion?

When the direction of travel is at right angles to the centripetal force