Physics mock - failed questions
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Radio waves and microwaves are two types of EM waves Both: . Can be used for communications . Travel at the same speed through air Give two more properties that are the same for both radio waves and microwaves
. They are both transverse . They both transfer energy
The miners working in a salt mine use smooth wooden slides to move quickly from one level to another. The speed of the miner at the bottom of the slide is much less than the calculated maximum possible speed. Explain why:
Work is done against friction between the miner and the slide due to the slide not being perfectly smooth causing kinetic energy to be transferred as thermal energy into the surroundings
How do you find speed using a curved line on a distance time graph?
. Draw a tangent to the curve, as big as possible . Use the tangent to find the gradient (speed)
State two forces that must be balanced when a moving car reaches it’s maximum speed:
Forward force and air resistance are equal
Describe the method for investigating the refraction of light at the boundary between air and glass:
. Place a glass block on a piece of paper . Draw around the glass block . Use the ray box to shine a ray of light through the glass block . Mark the ray of light entering the block . Mark the ray of light emerging from the block . Join the points to show the path of the complete ray through the block . Draw a normal line at 90 degrees to the surface . Use a protractor to measure the angle of incidence . Use a protractor to measure the angle of refraction . Use a ray box to shine a ray of light at a range of different angles of incidence . Increase angle of incidence in 10 degree intervals . From AOI of 10 degrees to 70
The student repeated measurements 3 times each WHen the andlge of incidence was 40 degrees, the three measured values for the angle of refraction were: 28, 25, 22 Estimate the uncertainty in the angle of refraction when the angle of incidence was 40 degrees: 28 - 22 = 6 degrees, 6 degrees / 2 = +- 3 degrees
Why does a wider ray give less accurate results compared to using a narrower ray?
. Is is harder to judge where the centre of a wider ray is . This causes a larger uncertainty in the meausrements . This increases the change of random error