Forces and Motion

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Forces and Motion

• Objectives To review
• Speed
• Distance-Time Graphs
• Velocity-Time Graphs
• Acceleration
• Newtons Laws
• Falling Objects
• Forces on vehicles

2
Speed

• Equation

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Displacement Time Graph

• Distance is how far you go.
• Displacement is how far you are from a particular
  place.

4
Displacement-Time and Velocity-Time Graphs

• Drawing graphs (gradient and area)

5
Acceleration

• Acceleration is the change in velocity over a
  given time.
• acceleration Change in speed (final speed
  initial speed)
• Change in time (final time initial
  time)

6
Forces

• Newtons First Law.
• An object will remain stationary or go at a
  constant velocity unless there is a resultant
  force on it. This will make it change direction
  or change its speed.

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Forces

• Newtons Third Law
• Whenever you push something, it pushes back with
  the same type of force exactly the same amount.
• (Every force has an equal and opposite reaction
  force)

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Forces

• Newtons Second Law
• The acceleration of something is proportional to
  the amount of force on it and inversely
  proportional to its mass
•  
• OR
•  
• Force mass x acceleration
• Pushing things
• Graphs

9
Falling Objects

• Drop stuff

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Stopping Distance

• This is the distance moved by the vehicle between
  the driver seeing the obstacle and the vehicle
  stopping.
• The vehicle keeps moving at a steady speed whilst
  the driver reacts(thinking distance)
• The vehicle slows down whilst the brakes are
  applied(braking distance)
• Stopping Thinking Braking

13
Stopping Distance
Total stopping distance is the area under the
whole graph
14
Thinking Distance

• Factors that affect thinking distance are
• driver tiredness
• influence of alcohol or other drugs
• more speed
• distractions or lack of concentration.

15
Braking distance

• Factors that affect braking distance are
• road conditions slippy, icy, wet
• car conditions - bald tyres, poor brakes
• more speed.