Speeding up and Slowing Down - AQA GCSE Physics Additional

Reviosion Notes on speeding up and slowing down, resultant forces and stopping distance.

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Physics ­ Speeding up and Slowing Down
Forces between objects:
Whenever objects push or pull on each other they exert
equal and opposite forces.
EG: To pull a car out of the mud, the force of the tractor on the
ground needs to be greater than the force of the mud on the car.
The force of the rope on the car and the force of the car on the
rope are equal.
Friction:
The friction acts where
the wheel is in contact
with the ground.
Both forces are equal.
Resultant Force:
Resultant force ­ the single force that has the same affect as all
the forces acting on a object
When the resultant force on an object is zero, the object...
Remains stationary
Continues at the same speed and in the same direction.
Eg.) A heavy crate is pushed along the floor. The force of the push
is equal to the force of friction and in the opposite direction so the
resultant force is zero.
When the resultant force of an object is not zero...
The movement of the object depends on the size and
direction of the resultant force.

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Eg.) When a jet plane takes off, the thrust force of the engines is
greater than the air resistance. The resultant force is the
difference between the thrust force and the air resistance force
and therefore the resultant force is not zero. The greater the
resultant force, the quicker the take-off.…read more

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The Thinking Distance ­ the distance travelled in the time it
takes for the driver to react to something.
The Braking Distance ­ the distance travelled in the time it take
for the braking force to stop the vehicle.
The Stopping Distance = The Thinking Distance + The Braking
Distance.…read more

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If an object falls in fluid, the fluid drags the object. The drag
force increases with speed.
The resultant force is the object's weight minus the drag force.
The acceleration of an object decreases as it falls. This is
because the drag force increases as it speeds up, so the
resultant force on it decreases.
The object reaches a constant velocity when the drag is
equal and opposite to its weight. This is called Terminal
Velocity.…read more

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