Physics 1Pr June 2023

Question 1

Explain which direction the wire is moved in the magnetic field to produce a
current in the wire.

Answer 1

Up and down from cutting of field lines

Question 2

Explain why a current is produced in the wire when the wire is moved in the
magnetic field.

Answer 2

• cutting field induces voltage
• circuit is complete so voltage induces current

Question 3

Safety when handling radioactive material

Answer 3

• arm length
• tongs
• goggles
• gloves
• lead apron

Question 4

Explain how the acceleration of the firework changes between take-off and
running out of fuel.
You can assume that the thrust force stays the same as the firework burns
the fuel.

Answer 4

• weight decreases
• air resistance increases
• consistent inteference in Resultant force
• cause changing accelerations

Question 5

The firework makes a sound with constant frequency.
As the firework moves upwards, people on the ground notice that the frequency
of the sound they hear changes
Explain how the Doppler effect causes the observed frequency of sound to
change for the people on the ground.

Answer 5

• frequency decreases;
• speed of waves constant;
• wavefronts behind firework spread out/eq;
• causing an increased wavelength (at the
  observer);
• f = speed ÷ wavelength;