WJEC GCSE Physics 2 Forces and Motion

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  • Created on: 22-05-12 18:12
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Physics Revision Notes:
Forces and Motion
Measuring motion and describing graphs:
Speed = distance/ time
Acceleration =Change in speed (or velocity)
time taken for the change
Acceleration is measured in the unit ms-2
Resultant force- The overall force acting on an object, e.g. on the truck below, the resultant force
would be 40N
If the forces acting on an object are unbalanced, the object will move in the direction of the biggest
Newton's second law is
f=m x a, as shown in the triangle.
E.g. Find the force if a car has a mass of
700kg, and a driver pushes the car
with an acceleration of 0.05ms-2

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Force = 700kg x 0.05ms-2
Force = 35kN (kilo Newtons)
Types of Force:
Forces acting against the motion Forces acting to make an object Forces acting against
of an object move the weight of an object
Friction Thrust Up thrust
Drag Driving Force
Air Resistance
Gravity can be grouped in either of the first two depending on the activity
Weight and Mass-
The mass (kg) of an object does not change wherever you are in the universe, whereas weight (N)
does.…read more

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Equations and how to use them:
Work Done-
Anytime energy is used to do something, it is said that work is done. An example of this might be to
lift a box onto a table. To calculate `work done,' you must know the distance an object is moved etc.
and the average force used to move the object.
Work done =Force x Distance
Kinetic Energy (KE)-
Kinetic energy is the energy an object possesses when it is motion, e.g.…read more

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Safety Features-
Cars are designed to convert KE from the crash into different forms of energy, safe for the
Crumple zones, on the front and backs of cars, are designed to crumple easily, so kinetic
energy is put into changing their shape
Air bags increase the time of the collision, so the energy acting on the passenger isn't as
concentrated, they also prevent passengers from hitting hard surfaces
Seat belts absorb energy by stretching the material; this slows down the impact on the
passenger.…read more


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