SA1 Revision - Chp 9 Forces & Energy

A block of weight 600 N is placed on the floor. 

Which face, A, B or C, should you place on the floor such

that the pressure exerted is greatest?

• A

• B

• C

Answer explanation

The smaller the contact area, the greater the exerted pressure by the same applied force.

What are the energy changes in a battery-operated torch?

• chemical potential energy

  -> electrical energy

  -> light + heat

• electrical energy

  -> kinetic ->

  light + heat energy

• electrical energy

  -> chemical potential energy -> light + heat

• kinetic energy -> electrical energy-> light + heat

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When you wind up the spring of a mechanical clock, what form of energy has the clock gained?

• Gravitational Potential Energy

• Elastic Potential Energy

• Chemical Potential Energy

• Kinetic Energy

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[Continuation from previous question] When the clock is ticking, what form is the energy converted into?

• Gravitational Potential Energy

• Kinetic Energy

• Kinetic Energy and Sound Energy

• Kinetic Energy, Thermal Energy and Sound Energy

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Which ball has a larger amount of gravitational potential energy?

• A

• B

• A and B have the same gravitational potential energy.

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Which ball has a greater amount of kinetic energy?

• A

• B

• A and B have the same amount of kinetic energy.

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A cyclist accelerates (moving faster) down a slope.

How does the cyclist's energy change?

• GPE - decrease

  KE - decrease

• GPE - decrease

  KE - increase

• GPE - increase

  KE - decrease

• GPE - increase

  KE - increase

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A ball is drop from a height as shown.

Ignoring the effects of air resistance, the total energy is __________.

• greatest at point 1.

• greatest at point 2

• greatest at point 3

• the same at all points

Answer explanation

Total energy is conserved.

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A ball initially at rest rolls down the slope.

Assume that friction and air resistance is negligible.

Fill in the first blank at the top.

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A ball initially at rests rolls down a slope.

Assume that friction and air resistance is negligible.

Fill in the second blank in the middle.

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