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• Created by: Moonisah
• Created on: 27-05-12 14:06

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Moonisah Mirza
1. Construct a distance time graph for a moving body in a straight line when the body is
stationary or moving with constant speed.
2. Construct a velocity timer graph for a body moving with a constant velocity
3. What is the difference between speed and velocity?
Speed is the rate of motion, or the rate of change of position. Speed is measured in the
same physical units of measurement as velocity, but does not contain an element of
direction. Speed is the magnitude component of velocity. Velocity contains both the
magnitude and direction components.
4. How do you calculate speed?
Speed = Distance / Time
5. How do you calculate speed from a distance time graph?
The gradient of a distance time graph tells us the speed at which the object is moving. We
calculate the gradient of a line
6. What is acceleration?
The acceleration of an object is its change in velocity per second.
Acceleration; change in Velocity (m/s) / time taken for that change (s)
(M/s)2
7. How do you calculate acceleration from a velocity time graph?
The slope of the line on a velocity time graph represents acceleration.
8. What does the area under a velocity time graph represent?
The area under the velocity time graph represents distance travelled.
9. What is terminal velocity?
If an object falls freely it will accelerate downwards because of the force of the weight due
to gravity , eventually its acceleration will decrease because of air resistance, the object will
reach a constant velocity when the drag force ( air resistance) on it is equal and opposite to
its weight. We call this velocity its terminal velocity.
10. How do you calculate weight?
Weight (n) = Mass (kg) x Earth gravitational pull (n/kg)
11. What is the unit of measurement for weight?
Newton.

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Moonisah Mirza
12. What is a resultant force?
An object may have several different forces acting on it, which can have different strengths and
directions. But they can be added together to give the resultant force. This is a single force that has
the same effect on the object as all the individual forces acting together.
When all the forces are balanced, the resultant force is zero.
A stationary object remains stationary.…read more

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Moonisah Mirza
22. How do you work out momentum?
Momentum (kgm/s) = Mass (kg) x Velocity (m/s)
23. Momentum has both size and direction. True or false?
True
24. How do you calculate the change of momentum?
Force = Change in momentum / Time taken for that change
Change in momentum =force x Time taken foe that change
25. What happens to the momentum of collisions and explosions?
The total momentum in an explosion or collision stays the same.

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Moonisah Mirza
34. Memorise the symbols of the components in a circuit.
35. What does a graph for a current ­PD for a resistor at a constant temperature look like?
A) A filament lamp. B) a diode
A filament lamp
36. Compare the differences between a series circuit and a parallel circuit.
Series Circuit ~ the same current flows through all the components.
~ The voltage is shared between the components.…read more

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Moonisah Mirza
1- The case is made from tough plastic or rubber, because these materials are good
electrical insulators.
2- The three pins are made from brass, which is a good conductor of electricity.
3- There is a fuse between the live terminal and the live pin.
4- The fuse breaks the circuit if too much current flows.
5- The cable is secured in the plug by a cable grip. This should grip the cable itself, and not
the individual wires inside it.

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Moonisah Mirza
49. What is an isotope?
An isotope is an atom with a different number of neutrons and but the same number of
protons.
50. What is alpha decay and beta decay?
When a nucleus emits an alpha or beta particle it changes into another type of nucleus. We
say a nucleus reaction has taken place here.
In alpha decay a nucleus loses 2 protons and 2 neutrons. An alpha particle is the same size as