# P2 1

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• Created by: Florence
• Created on: 17-11-12 20:27

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