Physics- P2.1,2,3&4

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Calculating Speed

  • The SI unit of velocity/ speed is m/s.
  • Velocity is the speed given in a direction.


  • Accelertaion is the change in velocity ecery second.
  • Acceleration cam take on a negative acceleration= deceleration= slowing down.

Motion/ Distance time graphs

  • The steeper the gradient of a distance time graph the greater the speed.
  • Key Points:
  • 1) An object that is at rest is represented by a horizontal line on a DTG.
  • 2) The gradient or slope of a DGT equals the speed.


  • Contact- Those which require touch to happen:
  • Friction
  • Thrust
  • Up-thrust
  • Water/ air resistance
  • Non-Contact- Those which do not require touch to happen:
  • Garvity
  • Magnetic
  • Static electricity
  • Forces can be balanced or unbalanced

Newtons Laws

  • 1st Law:If the resultant force acting on an object is 0, the object will remain at rset... or at constant velocity.
  • 2nd Law: If a resultant force acts on an object with mass (m- kg), the it will experiance an accelertaion.
  • When were talking about the effect of gravity on something, we call the force weight.
  • 3rd Law:If an object exerts a force (Fa) on another object,B, then object B exerts an equal and opposite force (Fb) on object A.
  • In a swimming pool, you push  cvfdr4the water back and then the water pushes you forward.

Stopping Distances

  • Thinking distance- the distance travelled in the time taken for the driver to react.
  • Breaking distance- the disatnce travelled once breaked.

Hookes Law

  • An elastic material is one that will return to its original length when the force applied is taken away.
  • A plastic material is one that does not return to is original length once the force has been removed.
  • The amount of…


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