Phy Y10Y11 Y10 C10 Thermal Physics 0625 IGCSE (CORE)

A cyclist travels down a hill from rest at point X without pedalling.

The cyclist applies his brakes and the cycle stops at point Y.

Which energy transfers have taken place between X and Y?

Which energy resource is non-renewable?

• A geothermal

• B natural gas

• C solar

• D wind

A pump does 460 000J of work to raise water to fill a tank. It takes 7 minutes to fill the tank. What is the power of the pump?

• A 1.1 kW

• B 66 kW

• C 3200 kW

• D 190 000kW

Draw

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(b) Describe the arrangement, separation and motion of particles in a solid.

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Answer explanation

regular / uniform arrangement fixed (positions) vibrating close(ly) OR tight(ly) (packed)

(c) Fig. 3.3 shows a fire heating water in a metal pan.

(i) State the name of the process of thermal energy transfer through the metal of the pan

(ii) Describe how thermal energy is transferred through the water by convection.

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Answer explanation

water particles (at bottom of pan) gain thermal / internal / kinetic energy (water) particles move apart density of liquid decreases OR liquid becomes less dense less dense liquid rises causing liquid to circulate (in pan

(iii) State the temperature at which the water boils at standard atmospheric pressure.

temperature = ..................................................... °C [1

State the principle of conservation of energy

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Answer explanation

energy cannot be created or destroyed OR energy is only transformed or transferred (from one store / form / type to another)

(i) Using the information in Fig. 2.1, calculate the percentage of energy transferred from the chemical store to the kinetic store.

percentage = ..................................................... %

Answer explanation

30 (%) A2

100 – 70 A1