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2 formulas for wave speed
formula for resultant force
Name four factors that can influence the stopping distance of a vehicle.
formula for power
formula for efficiency
State the advantages and disadvantages of a small portable petrol-powered generator when compared to a wind-powered generator.
formula for change in gravitational potential energy
State two non-renewable power sources and two of their shared disadvantages.
What are bio-fuels?
Discuss the advantages and disadvantages of solar power.
Explain the benefits and disadvantages of replacing the power station with a wind farm.
What are the wavelengths of the spectrum of visible light?
List the known types of radiation, in order of decreasing wavelength
What is an average human walking speed? Give your answer in km per hour and meters per second.
Will there be more radiation inside or outside the earth's atmosphere? Why?
Which way do waves bend when they enter a more optically dense medium?
What is refraction?
Are electromagnetic waves transverse or longitudinal?
What type of electromagnetic waves are used in television remote controls?
Visible light from the Sun takes the same time to reach the Earth as ultraviolet radiation from the Sun. Explain this observation.
What is the difference between transverse and longitudinal waves? Give an example of each.
Explain the four properties of waves:
Amplitude
Wavelength
Frequency
Period
Four waves pass a point in one second. What is the period of the wave?
Define and name at least two examples of
1) a scalar quantity
2) a vector quantity
A cork is floating on some water. Explain how this arrangement can show whether waves on the water surface are transverse or longitudinal.
Imagine that waves are approaching the shallow end of a pool, at an angle. In the shallow water, the wave speed is less than in the deep water. The frequency remains the same. Explain what happens to the direction and the wavelength of these waves when they pass from the dep water into the shallow water.
What is refraction?
What happens when light passes into a less dense medium?
What happens when light passes into a denser medium?
A ball is dropped from height h above the ground. The speed of the ball just before it hits the ground is 5m/s. Calculate h.
(assume acceleration due to gravity = 10m/s2)
Describe the composition of the earth, from the outside toward the center.
What is the lithosphere?
Explain how some of the properties of P-waves and S-waves lead to the present model of the Earth's interior.
What is a refracting telescope? How does it work? What did Galileo see using a refracting telescope, and why was this significant?
What is a typical speed for an airplane?
What is a typical speed for a car on a motorway or highway?
What are safety features in vehicles designed to do? Give three examples.
What is Newton's first law of motion?
What is Newton's second law of motion?
Find the resultant force needed to accelerate an 80kg man on a 10kg bike at 0.25 m/s2
How is mass measured (in what units and with what instrument?)
How is weight measured?
What formula relates the two?
Why is it better to use a light gate instead of a stopwatch to measure short time intervals?
State why a rocket continues moving through space after turning off its thrusters.
What is Newton's third law?
A full shopping trolley and an empty one are moving at the same speed. Explain why it is easier to stop the empty trolley than the full trolley over the same amount of time.
What is inertial mass?
What is momentum?
What is CONSERVATION OF MOMENTUM?
Calculate the momentum of a 60kg woman running at 3m/s
Describe how momentum is conserved by a gun recoiling (moving backwards) as it shoots a bullet. (4 marks)
formula for kinetic energy store
