Energy changes in a system, and the ways energy is stored before and after such changes

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Question 47
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An experimental physics track layout

A heavy steel ball and its track can be modeled as a closed system.

a.

Which statement explains why the steel ball and the track can be considered a 'closed system'?

  • The temperature of the steel ball and track remains completely constant.
  • The total energy of the steel ball and track system remains constant.
  • The gravitational potential energy of the ball is always equal to its kinetic energy.
[1]
b.

The steel ball is released from rest at position A and rolls down the track to position B.

  • mass of the steel ball = 0.250 kg
  • vertical height between position A and position B = 90 cm
  • gravitational field strength = 9.8 N/kg

Calculate the maximum possible speed of the steel ball when it reaches position B.

[4]
c.

At position C, the steel ball's gravitational potential energy is 1.5 J greater than at position B. How much kinetic energy does the steel ball need at position B to successfully complete the vertical loop? Choose one option and explain your reasoning.

  • Less than 1.5 J
  • Exactly 1.5 J
  • More than 1.5 J
[2]

Energy changes in a system, and the ways energy is stored before and after such changes Questions

  1. GCSE
  2. /Physics
  3. /Energy changes in a system, and the ways energy is stored before and after such changes