Exam (elaborations)

GCSE Physics -Paper 2(AQA) Latest Exam Questions And All Correct Answers

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GCSE Physics

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GCSE Physics

Scalar - Answer quantities with only magnitude such as speed, distance, time and mass. Vector - Answer quantities with a magnitude and direction e.g. acceleration, force momentum and weight. A vector quantity can be represented as an arrow, the size representing the magnitude and the direc...

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non contact force

Institution GCSE Physics
Course GCSE Physics

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GCSE Physics -Paper 2(AQA) Latest
Exam Questions And All Correct
Answers.
Scalar - Answer quantities with only magnitude such as speed, distance, time and mass.

Vector - Answer quantities with a magnitude and direction e.g. acceleration, force momentum and
weight. A vector quantity can be represented as an arrow, the size representing the magnitude and the
direction, the direction.

Non-contact force - Answer the objects are physically separate e.g. magnetism/gravity/electrostatic.

3 non-contact forces - Answer magnetism

gravity

electrostatic

Contact force - Answer objects are physically touching .

3 contact forces - Answer friction

resistance

tension

Gravity - Answer Weight is the force acting on an object due to gravity, it acts on an objects 'centre of
mass' and is directly proportional to mass

,Weigh Equation - Answer Weight = mass x grav. field strength

Resultant forces - Answer A number of forces acting on an object may be replaced by a single force that
has the same effect as all the original forces acting together, this single force is the called the resultant
force.

In a tug of war, 1000N to the left and 800N to the right. The resultant force is 200N to the left

Free-Body force diagrams - Answer When an object is acted on by more than one force you can draw a
free-body force diagram to work out the resultant force on the object. It shows the forces acting on an
object without any other objects or other forces shown. Each force is shown on the diagram by a vector,
which is an arrow pointing in the direction of the force. ( the normal force is that component of the
contact force that is perpendicular to the surface that an object contacts)

How to resolve forces (force diagram steps) - Answer 1. Decide on a scale of N per cm.

2. Draw the 2 given forces, giving respect to their length (more cm if more N) and the angle that you are
given

3. Draw a line connecting the end of the 2 other lines to form a triangle

4. Measure the length of this line, then convert it to N by using the scale

Relationship between Joules and work done - Answer When a force causes and object to move, work is
done on the object so when the force causes displacement. One joule of work is done when a force of 1
newton displaces an object 1 metre. 1 Joule = 1 newton-metre.

Equation for word done - Answer work done = force x distance

Elastic Deformation - Answer When an elastic object is stretched, bent, twisted or compressed it will
return to its original form

,Inelastic Deformation - Answer Polyethene bags will not return to their original shape after being
deformed, this is inelastic.

Hooke's Law - Answer The extension of an elastic object is directly proportional to the force applied as
long as the limit of proportionality is not exceeded:

Equation for force (Hooke's law) - Answer force = spring constant x extention

Extension and compression's relationship with elastic potential energy explanation - Answer A force
that stretches or compresses a spring does work and elastic potential energy is stored in the spring,
provided the spring is not elastically deformed, the work done and elastic potential energy are equal.
Before the limit of proportionality is breeched the relationship is linear (directly proportional) afterwards
it is non-linear

Elastic potential energy equation (given) - Answer Elastic potential energy = 1/2 x spring constant x
extension^2

Moment meaning - Answer The turning effect of a force is called its 'moment'

Moment equation - Answer moment = force x distance

Balancing - Answer If an object is balanced the clockwise moment is equal to the anticlockwise
moment.

Levers - Answer A lever consists of a load, effort and pivot, levers use moments to multiply a force, they
allow a larger force to act on the load that is supplied by the effort.

Engine Gears - Answer Engine gears have two main jobs, producing torque and speed, however they
are inversely proportional so gears are made to make a compromise between the two in any given
situation.

, When starting a car we want high torque, which means being able to carry a greater load , and
consequentially less speed. In low gears this is achieved as... - Answer 1. The engine causes a small cog
on the engine axle to rotate.

2. The small cog on the engine axle is connected to a larger cog on the wheel axle, which increases the
torque (moment) exerted.

3.A high turning force but low speed is exerted on the wheel (low gear)

When a car is already moving, we want a high speed which is achieved as... - Answer 1.The engine
causes a larger cog on the engine axle to turn.

2.The larger cog on the engine axle is connected to a smaller cog on the wheel axle, causing a high rate
of rotation, but a low turning force.

3. The wheel rotates quickly, causing a high speed

Unit for pressure - Answer Pressure is a measure of force per unit of area, the si unit is Pascals (Pa)
which is one N/m^2

Pressure Equation - Answer Pressure = force normal to the surface/area

Manometer with oil and water - Answer The pressure is equal at each end of the tube, so the less
dense oil is higher.(p=hdg)(on sheet)

Buoyancy - Answer The partially or fully submerged object experiences more pressure at the bottom
that on top, this creates a resultant up thrust force called buoyancy.

Why objects float - Answer An object will rise or float if it is less dense than the substance it is in or if it
displaces an amount of the substance that it is floating in greater than it weights, steel ships have a lot of
air in them and therefore weigh less than the equivalent amount of water that the ship displaces, so it
floats this is because the up thrust from the pressure is greater than the down force of the weight.

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