PHYSICS P2 2018

uniform acceleration

When the ball hits the ground, energy is transferred from the ball to the Earth

Explain how the data in Figure 1 shows this energy transfer (4)

• reduce effects of random errors

• identify anomalous results

Hooke’s Law states that:

‘The extension of an elastic object is directly proportional to the force applied, provided the limit of proportionality is not exceeded.’

The student concluded that over the range of force used, the spring obeyed Hooke’s Law.

Explain how the data supports the student’s conclusion.

• straight line

• which passes through the origin

• generator effect

• or because the magnet changes direction

The seismometer cannot detect small vibrations

Suggest two changes to the design of the seismometer that would make it more sensitive to small vibrations (2)

• stronger magnetic field

• more turns on the coil

• turns pushed closer together

• spring with a lower spring constant

all heights drawn the same as tube 1

Suggest what the student may have done during the investigation to cause each angle of reflection to have a range of values. (1)

• misjudging the centre of the ray

• no replacing the mirror/ray box to the same position

State one change the student should make to the apparatus if he wants to use the same method to investigate diffuse reflection. (1)

replace the mirror with an irregular reflecting surface

any one from:

• too few turns/coils on the secondary

• p.d. across the primary was reduced

Why do scientists sometimes have different models like the wave and particle models of light? (1)

• different models may be appropriate in different situations

• at least three circles drawn

• with clockwise arrows on the circles

What apparatus should be used to investigate diffuse reflection?

irregular reflecting surface