P2 1

P2 1.1

• Forces can:
  • change the shape of an object
  • make start moving
  • make it stop moving
  • change its speed
  • change the direction it moves in
• Forces are measured in newtons (N)
• When two objects interact
  • The force on one object - action force - is matched by an opposite force - reaction force - on the other object.
• Resultant force - The overall force resulting from a combination of separate forces.
• If the resultant force is zero it will either:
  • stay still (if it was stationary)
  • keep moving at the same speed in the same direction as before.
• If the forces are unbalanced the object will move in the direction of the strongest force with the same force (N) as the difference between the forces.

P2 1.2

• Forces can deform or change the shape of an object..
• Some materials deform easily. 
• In other materials we cannot see a change because the material hardly deforms or the change is so quick we do not see it.
• Objects that are elastic can be pushed and pulled out of shape but will regain their original shape once released.
• The spring constant
  • Force and extension equation - F = k X x
    • F - force - N
    • k - spring constant - n/m
    • x - extension - m

P2 1.3

• Speed - how far something moves in a known time
  • speed equation - v = d ÷ t
    • v - speed - m/s
    • d - distance - m
    • t - time - s
• Distance / Time graphs
  • the steeper the gradient the higher the speed.
• Velocity - The speed of an object in a given direction.
• Velocity / Time graphs
  • Area below…