January 09, 2021

P1 Conservation and dissipation of energy

This quiz covers the Physics Topic 1: Conservation and dissipation of energy

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The springs in a car’s suspension have a spring constant of 50 000 N/m. The elastic potential energy store is 0.025 J. Calculate the extension of the springs.

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A machine is 40 % efficient. The total energy supplied to the machine is 4 kJ. Calculate how much useful energy can be transferred.

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The table shows the power ratings of some different appliances. Place the appliances in order of power rating, starting with the lowest power rating.

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A spring with a spring constant of 50 N/m is stretched by an extension of 2 cm. Calculate the energy in its elastic energy potential store. Use the equation:

elastic potential energy = 0.5 × spring constant × extension^{2}

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A motor has an input power of 120 W and is 40 % efficient. Calculate the power wasted by the motor.

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A suitcase of mass 20 kg moves along a conveyer belt at 0.5 m/s. Calculate its kinetic energy.

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A motor transfers 12 kJ of energy in 30 s. Calculate its power.

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A person climbs up some stairs. Which sentence about the change in energy stores is correct?

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Calculate how much work is done when a force of 1600 N pulls a car through a distance of 40 m in the direction of the force.

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Read the descriptions below about energy transfers when a heavy object is dropped. Only one description is correct. Select the correct description.

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Which of the following statements about a closed system is correct?

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Which of the following involves useful energy transfers by heating and by a force?

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Which of the following is an energy store?

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Whic one is **NOT** an energy store?

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A 25000 kg plane takes off and climbs to a height of 12000 m above it’s take off point. How much energy has been transferred to its gravitational potential energy store?

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We can calculate the gravitational potential energy using this:

(gpe) E = m __ h

Select the correct letter to complete the above formula.

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A motorbike with 1.17 x 10^{4 } J energy in its kinetic energy store travels at 12.0 m/s. What is the mass of the motorbike?

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Complete the conservation of energy principle statement, by selecting the correct pair of words from the options.

**Energy can be _____________________ usefully, stored, or dissipated, but can never be ___________________ or destroyed.**

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