PHYSICS IGCSE Forces

Really good coloured revision notes on Forces. Includes:

  • Terminal Velocity
  • Hookes Law
  • Resultant Forces
  • Inertia 
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  • Created by: Cecily
  • Created on: 17-04-12 18:57
Preview of PHYSICS IGCSE Forces

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Inertia- The tendency for an object to resist
any change in its motion. The bigger an object
is, the more it resists a change in its motion.
NEWTONS LAWS OF MOTION:
An object at rest will remain at rest and an
object win a straight line with a constant
speed will continue to do so, provided NO
EXTERNAL FORCES ACT UPON IT.
If there are unbalanced forces acting on an
object, then the object will accelerate in
that direction. The acceleration is
proportional to the force applied. For an
object of a certain mass:
THE GREATER THE FORCE, THE
GREATER THE ACCELERATION
FORCES: THREE THINGS CAN HAPPEN:
Change direction
Change speed
Change shape
UNBALANCED FORCES:

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EG:
As the force increases the acceleration
increases:
Provided the mass of the object is constant.
If the mass of the trolley doubled, acceleration
is halved for the same force.
Free- fall/ skydiver:
When an object is released from a height, its
starting speed is O m/s
As it falls, it will accelerate due to the force of
gravity.
Acceleration = 10 m/s
Every second, the object's velocity increases by
10m/s.
However, as it falls, air resistance (drag)
opposes the motion.…read more

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The surface area of the object
The velocity of it
TERMINAL VELOCITY:
Velocity reached when drag is equal to
weight.…read more

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The objects own weight causes it to accelerate.
Drag reduces the acceleration gradually as
drag increases.
When the drag is equal and opposite to the
weight, it can no longer accelerate and the
object falls at a constant velocity =
TERMINAL VELOCITY. (through any fluid,
an object will reach terminal velocity.)
1. When Susan first steps out of the plane
2. Her downwards velocity is zero
3. The only force acting on her is her weight
4.…read more

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TOTAL STOPPING DISTANCE= THINKING
DISTANCE +
BRAKING
DISTANCE
THINKING DISTANCE: The faster the car is
going, the further the car will travel in the
same reaction time
Depends on:
Distractions
Drugs/ Alcohol
Tiredness
BRAKING DISTANCE:
The speed of the car
The condition of the brakes
The road conditions (ice)
Mass of car (passengers/ large car)
HOOKES LAW:
As the force increases, the extension
increases. As the force is doubled,
extension is doubled.…read more

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