FORCES

Scalar

Has magnitude (size) and NO direction

Vector

Has magnitude and direction

Contact and Noncontact forces

Forces

a force is a push or pull that acts on an object due to the interaction of another object

→ N (newtons)

Contact forces

→ Physically touching forces

Non contact forces

→ Physically separated for example gravitational force

Gravity and Weight

Mass is measured in kg and is scalar

→ doesn’t matter where it is

Weight of an object is the force acting on it due to gravity. Measured in N (newtons)

→ does matter where it is

→ on earth (g) is 9.8

WEIGHT = MASS X GRAVITATIONAL FEILD

• We can measure weight using a newtonmetre

The weight of an object can be considered to act at at a single point, this is known as centre of mass

Resultant Forces

Resultant force is a single force that has the same effect as all of the original forces acting together