Forces Physics

• Force


  That which changes or tends to change the shape or state of rest or motion of a body
• Force


  • Measured using a newton balance
  • Measured in newtons (N)
• Types of force


  • Contact forces (e.g. friction, push)
  • Forces acting at a distance (e.g. gravitational force, magnetic force)
• Mass

  A measure of the quantity of matter in a body
• Mass


  • Measured using scales
  • Measured in kilograms (kg)
• Weight

  A measure of the force of gravity on a body
• Weight


  • Measured using a newton balance
  • Measured in newtons (N)
• The symbol used for the Earth's gravitational field strength is g, and its value is 10 N/kg
• Astronaut's mass on the Moon is the same as on Earth, 65 kg
• Astronaut's weight on the Moon

  Will be less than weight on Earth
• The forces are unbalanced and the block moves to the right
• The forces are balanced and the block remains stationary
• The forces are unbalanced and the car speeds up
• The forces are balanced and the car travels at a steady speed