Physics AQA Forces

• What is a scalar quantity?

  A scalar quantity only measures magnitude.
• What is a vector quantity?

  A quantity that measures both magnitude and direction.
• What is a force?

  A push or pull that acts on an object due to interaction with another object
• What does force affect?

  Speed, direction and shape
• Examples of scalar quantities

  Speed, distance, mass, temperature, time, volume, density, energy
• Example of vector quantities

  Displacement, velocity, force, acceleration
• Examples of forces

  Weight, friction, tension, thrust, upthrust, reaction force, compression, contact force, non-contact force.
• What is tension?

  Force transmitted through a cable or string when pulled on by forces acting on its opposite ends.
• What is contact force?

  Force that acts between objects that are physically touching
• Examples of contact force

  Friction, tension, reaction force
• What is a non-contact force?

  Force that acts at a distance without contact due to the action of a field
• Examples of non-contact forces

  Gravity, electrostatic force, magnetic force
• What is a reaction force?

  Force that acts perpendicular to the surface due to the contact between two objects
• Equation for work done

  Work done (j)= force (N) x distance (m)
• Work done

  Energy transferred
• What is uniform motion?

  Constant speed
• Acceleration definition

  Rate of change of velocity
• Equation for acceleration

  Acceleration (m/s^2) = change in velocity (m/s) / time