Mechanics is the study of the interactions between physical bodies and their consequent motion.

In this topic, we will:

- Define the quantities used to describe motion (displacement, velocity, acceleration).
- Derive a set of equations that give the relationship between the displacement, velocity, acceleration and time when the acceleration is constant.
- Solve problems involving constant acceleration in 1 and 2-dimensions.
- Understand the effects of forces.
- Relate unbalanced forces to motion.
- Consider energy and the capabilities that this gives to bodies.
- Define power and efficiency.
- Learn about types of collision in terms of conservation of momentum.

### Forces

In an attempt to simplify we can consider all bodies to be a like a small ball with forces acting at the centre. Alternatively we could just consider the case of a small ball and ignore all other possibilities.

### Kinematics

Before we can model motion we need to define the quantities that we are going to use, once that has been done we can investigate how they are related.

### Work and energy

To predict the outcome of the collision between two ball we need more than just the conservation of momentum, we neeed to consider energy as well.