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.

### Collisions

Using the laws of conservation of energy it is possible to calculate the combined velocity of two astronauts colliding in space, amongst other things.

### Balancing forces

Balancing forces in 1 and 2 dimensions on the Earth and in space.

### 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.

### Potential energy

It might be better to call potential energy positional energy since it is the energy a body has due to its position.

### Examples of forces

Normal force, weight, tension, buoyancy. drag and friction all colourfully illustrated with Algodoo.

### 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.