Stuff Learnt From Mock

Question 1

How is the total energy of the system conferred as a car travels from a slope into a flat of water

Answer 1

Work is done against friction and energy is stored in kinetic energy of water

Question 2

Give 3 modifications a student could make to ensure that a circuit works correctly

Answer 2

Connect ammeter in series
Connect voltmeter in parallel
Reverse connection for one of the cells

Question 3

When measuring temperature of thermistor why do we use a water bath and how could we develop temperature range

Answer 3

A thermistor and water are at the same temperature

And add ice to increase lower limit of temperature range

Question 4

Give one reason why earthing reduces risk of fire

Answer 4

Discharges the air craft and prevents sparking/causing a fire

Question 5

Explain how an air craft can become electrically charged as it flies through the air

Answer 5

Friction between air craft and air causes electron transfer between air craft and air

Question 6

Devise an experiment to investigate the horizontal force needed to selected the trucks from the engine

Answer 6

Use a Newton’s meter horizontally
Record largest force observed
Repeat readings several times under same conditions

Question 7

Explain why a larger force is needed to separate the trucks from the engine of the force applied at an angle to horizontal

Answer 7

The applied force must be resolved horizontally to determine the force that separates the engine from the trucks.
And since the size of the resolved force is always less than the size of the actual force then a larger force is needed to separate the trucks from the engine

Question 8

What current does a transmission wire carry

Answer 8

An alternating current- force is caused by the current that varies in size and direction