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Eighth Grade (Grade 8) Physics Questions

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Grade 8 Heat Transfer
Which of the following best explains why the end of a spoon sticking out of a cup of hot water also gets hot like the end in the hot water?
  1. The hot water causes a chemical reaction to take place in the spoon.
  2. The heat from the hot water is conducted to the spoon handle.
  3. The hot water heats the air surrounding the upper part of the spoon.
  4. The hot water causes a physical change in the spoon handle.
Grade 8 Energy and Momentum
Any energy that is stored is called
  1. Kinetic Energy
  2. Cooking energy
  3. Potential energy
  4. Thermal energy
  5. Sound Energy
  6. Electrochemical Energy
Grade 8 Simple Machines
Look at the image of the pulley. If bucket A has a mass of 5 kg, which of the following statements is true about the minimum effort force required to lift the bucket if friction is ignored?
Pulley System
  1. it would take 0 kg of effort to lift the bucket
  2. it would take 2.5 kg of effort to lift the bucket
  3. it would take 5 kg of effort to lift the bucket
  4. it would take 10 kg of effort to lift the bucket
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