Forces

• Scalar quantity defintion

  • A qunatity that Only has a magnitude
  • It doesn't have a direction
• Vector quantity defintion 


  It has both a magnitude and a direction
• Force defintion 


  A push or pull acting on an object due to an interaction with another object
• 2 types of forces

  1. Contact
  2. Non contact
• Examples of contact forces

  • Air resistance
  • Friction
  • Tension
• Examples of non contact forces

  • Gravitation forces
  • Magnetic forces
  • Elactrostatic forces
• Interaction pair defintion 


  Forces that are equal and opposite and act on 2 interacting objects
• Scalar quantities example

  1. Mass
  2. Temperature
  3. Speed
  4. Distance
  5. Time
• Vector quantities examples

  1. Acceleration
  2. force
  3. Momentum
  4. Weight
  5. Velocity
• Is force a vector quantity

  Yes it has direction and a magnitude
• Normal contact Force


  This force happens when 2 forces are in direct contact
• What is the weight directly proportional to?

  The mass
• How to measure an objects weight

  Newton meter
• Resultant force definition 


  A single force that has the same effect as all original forces acting together
• How to calculate resultant force

  Smaller force minus the bigger force
• Work done force distance equation


  Work done = force x distance
• Work definition 


  Whenever a force is used to move an object energy is transferred
• What every store does a moving object have

  Kinetic energy store
• What’s the normal walking speed

  1.5 metres per second
• What’s the normal running speed

  3 metres per second
• What’s the typical cycling speed

  6 metres per second
• What’s the typical speed for a car on a main road

  13 metres per second
• Typical speed of a fast train in Uk

  50 metres per second
• Typical speed of a cruising aeroplane

  250 metres per second
• Typical speed of sound

  330 metres per second
• How do you work out the speed on distance time graph

  Work out gradient
• How to work out gradient of a steep stop on distance time graph

  Draw a tangent
• Velocity definition


  Speed in any given direction
• Acceleration time change in velocity equation


  change in velocity = acceleration x time
• How to work out acceleration on a velocity time graph

  Work out gradient
• What does the area under a velocity time graph tell us

  The displacement
• equation for an object accelerating at a constant Rate

  Final velocity - initial velocity =2 x acceleration x distance