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

## Learning objectives

After studying this topic, you should be able to:

- 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.

### Kinematics

Kinematics is the study of moving objects.

### Forces

Every new movement, direction, squash or stretch requires a force.

### Work and energy

Work done and energy changed are equivalent.