Incorrect from past papers2

Question 1

When you have to

Draw the charges induced on something

Answer 1

You need to draw not the opposite charge attracting something induced but the like charges repelling

Question 2

The variable resistor is used to prevent the iron wire (or what youre measuring) from becoming too hot.

Explain how the variable resistor is used to prevent the iron wire from becoming too hot.

Answer 2

(variable) resistor increases the resistance (of the circuit) (1)

(therefore) keeps the current constant / small(er) (1)

because current increases temperature of the (iron) wire
(1)

Question 3

Describe the motion of particles in liquid

Answer 3

(motion is) random (1)

various {speeds / velocities / kinetic energies} (1)

bump into each other / collide(1)

fast(er than solid) (1)

Question 4

When a q asks to use some data (ie: figure 7) to describe something what must you do

Answer 4

Use 2 points of data and say something about them

ie: if the graph is negatively sloping get 2 points and say this shows they’re negatively correlated or something

Question 5

How do you draw magnetic fields

Answer 5

Exactly like electric fields and positive is north and south is neg

Question 6

How do you describe magnetic fields when there is one magnet lifting up another due to similar sides

Answer 6

magnetic fields interact (1)

(force due to) repulsion (between magnets) (1)

Question 7

For freshwater and seawater, an object floats on diff amounts for each

the upthrust is the

why are the amounts they float diff

Answer 7

equal

weight of ball = weight of
water displaced (1)

seawater more dense than
fresh water (1)

smaller volume of seawater
(needs to be) displaced (1)

to produce same weight of
water (displaced) (1)

Question 8

The weight of the spring is 1N.
The weight of the block below the spring is 5N.

The force exerted on the top of the spring by a hook hooking the spring from the ceiling is

Answer 8

6N up

Question 9

If you have one force going right at 40N and one down at 30N whats the resultant force

Answer 9

Bottom right

50N (use pythag)

Question 10

How does regenerative braking on a tesla work

Answer 10

an explanation linking (energy transfers when the car is decelerating)

(from) kinetic energy (store) (1)

(to) chemical energy (store) (1)

Question 11

Some energy is wasted due to friction.
Suggest another reason why some energy is wasted in using a
pulley system.

Answer 11

additional mass in the system
(1)

rope stretches (1)