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3.2 Internal energy and energy transfers

3.2 Internal energy and energy transfers

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Question 5
a.

Complete the sentence.

Choose answers from the box:

  • chemical
  • elastic potential
  • gravitational potential
  • kinetic

As the skateboarder accelerates, the ___________ energy store in the skateboarder's body decreases and the ___________ energy of the skateboarder increases.

[2]
b.

The total mass of the skateboarder and skateboard is 60 kg60\text{ kg}60 kg. The speed of the skateboarder is 6 m/s6\text{ m/s}6 m/s.

Calculate the kinetic energy of the skateboarder and skateboard.

Use the equation:

kinetic energy=0.5×mass×(speed)2 \text{kinetic energy} = 0.5 \times \text{mass} \times (\text{speed})^2 kinetic energy=0.5×mass×(speed)2
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c.

When the skateboarder drags their shoe on the ground to slow down, friction causes the temperature of the shoe sole to increase.

  • The temperature of the shoe sole increases by 15∘C15^\circ\text{C}15∘C.
  • The mass of the shoe sole is 0.12 kg0.12\text{ kg}0.12 kg.
  • The specific heat capacity of the shoe sole material is 1500 J/kg∘C1500\text{ J/kg}^\circ\text{C}1500 J/kg∘C.

Calculate the change in thermal energy of the shoe sole.

Use the equation:

change in thermal energy=mass×specific heat capacity×temperature change \text{change in thermal energy} = \text{mass} \times \text{specific heat capacity} \times \text{temperature change} change in thermal energy=mass×specific heat capacity×temperature change
[2]
d.

How is the internal energy of the particles in the shoe sole affected by the increase in temperature?

Select one:

  • Decreased
  • Increased
  • Not affected
[1]
Markscheme

3.2 Internal energy and energy transfers Questions

  1. GCSE
  2. /Physics
  3. /3.2 Internal energy and energy transfers

37 exam-style questions on AQA GCSE Physics 3.2 Internal energy and energy transfers, covering 3.2.1 Internal energy, 3.2.2 Temperature changes in a system and specific heat capacity, and 3.2.3 Changes of state and specific latent heat. Each one has a worked solution and a mark scheme showing where the marks go.

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