Science

Force = mass multiplied by acceleration

Change in velocity = time multiplied by acceleration

Laws of Motion

1. An object at rest wants to stay at rest. An object in motion wants to stay in motion with a constant speed in a straight line. The object will continue either state of motion unless acted upon by an unbalanced force. The object does not accelerate. (Net force = 0)

2. When an unbalanced force acts on an object, the object will accelerate in the direction of the unbalanced force. (Net force ≠ 0)

3. For every force (action) there is an equal and opposite force (reaction). This means there is no such thing as a single force.

Similar but different (As one increases, they all do)

1. Mass: Amount of matter in an object

2. Weight: Measure of gravitational force upon mass

3. Inertia: Resistance any object has to any change in its motion. Not measured— only compared. Heavy objects, which are harder to stop or start moving, have more inertia.

Contact forces

• Push and Pull

• Friction (Earth on object)

• Air resistance

• Spring (Elastic)

• Tension

• Normal (Perpendicular to a surface

• Buoyant

Non-contact forces

• Gravity

• Magnetic

• Electric

• Nuclear