# Newton's Laws of Motion

### by: Meaghan McInnis

## Newton's Law of Inertia

Newton's law of inertia, or Newton's second law of motion, states that an object will not change speed or direction unless acted on by an unbalanced force. Inertia is the tendency of an object to resist a change in motion. An object at rest will stay at rest unless acted on by and unbalanced force. An object in motion will stay in motion at the same speed and direction unless acted on by an unbalanced force.

## Newton's Law of Force and Acceleration

Newton's law of force and acceleration, or Newton's second law of motion, states that the acceleration of an object depends on the mass of the object and the force applied. Acceleration is the rate at which velocity changes over time. Acceleration happens when an object changes speed, direction, or both. Acceleration can be found by using the formula a=F/m. Acceleration is speeding up, slowing down, starting, stopping, or changing direction.

## Newton's Law of Action/Reaction

Newton's law of action/reaction, or Newton's third law of motion, states that for every action the is an equal and opposite reaction. This law basically means that all forces act in pairs. Every action force causes a reaction that is both equal in size and strength.