Forces

Force

Contact forces

• Friction
• air resistance
• tension
• normal contract forces

Non-contact force

• Gravity
• electrostatic
• magnetic

Vector

Size and direction

Scaler 

Size only

Mass and weight

• weight is the effect of gravity on the mass of an object
• To measure the weight of an object you can use a newton metre 
• to measure the mass of an object you can use mass balance

Resultant force

is the total direction and force of…