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WorksheetsEnergy Recall Quiz
Total questions: 9
Worksheet time: 14mins
To calculate the kinetic energy of an object you must use this equation: Ek = 0.5 x mass x speed2. Which of the following objects has the most kinetic energy?
A 10 kg mass with a speed of 5 m/s.
A 5 kg mass with a speed of 10 m/s.
A 2 kg mass with a speed of 20 m/s.
A 0.1 kg mass with a speed of 100 m/s.
To calculate the gravitational potential energy of an object you must use the equation: Ep = mass x gravitational field strength x height. Which of the following objects has the most gravitational potential energy?
A 3 kg mass, 5 m above the ground on Earth (g = 9.8 N/kg)
A 4 kg mass, 4 m above the ground on Venus (g = 8.9 N/kg)
A 10 kg mass, 5 m above the ground on Mars (g = 3.4 N/kg)
A 9 kg mass, 11 m above the ground on the Moon (g = 1.6 N/kg)
To calculate the elastic potential energy you must use the equation: Ee = 0.5 x spring constant x extension2. (Extension must be in metres, m) Calculate the elastic potential energy stored in a spring with a spring constant of 200 N/m that has been stretched from a length of 117 cm to a length of 127 cm.
0.1 J
1.0 J
10.0 J
100.0 J
Which is the correct equation that links work done, power and time?
power = work done x time
time = power x work done
work done = power x time
work done = power / time
A toaster takes 200 s to transfer 180,000 J of energy. What is the power of the toaster?
90 W
900 W
9,000 W
90,000 W
An electric motor transfers 24 J of energy usefully, but wastes 16 J of energy in doing so. What is the efficiency of the motor?
16 J ÷ 24 J = 0.67
24 J ÷ 16 J = 1.5
16 J ÷ 40 J = 0.4
24 J ÷ 40 J = 0.6
What would an efficiency of 0% tell you about the energy transfers of a device?
The device is not working.
The device is not working in the way that it was designed.
There is not enough energy being transferred for the device to work.
All the energy that is transferred is to an unwanted energy store.
If the speed of an object is increasing, its (a) energy store is increasing.
As an object falls it gains kinetic energy as its _______________ ___________ energy store decreases.
(a)
