Answers OC27 Physical Sci-2003310-S1-Keuten-DAquinoUnit Test

Unit 4: Test Answers

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A 40 kg dog is sitting on top of a hillside and has a potential energy of 1,568 J. What is the height of the hillside? (Formula: PE = mgh)

3.9 m

4.0 m

39.2 m

40.0 m

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Two examples of energy transformations are shown.

begin with chemical energy.

begin with electrical energy.

result in radiant energy.

result in mechanical energy.

This table shows four examples of experiments.

Lily and Henry

Astrid and Bob

Lily, Astrid, Henry, and Bob

Astrid, Henry, and Bob

Ryan is examining the energy of the particles in a bar of gold. What is Ryan most likely studying?

thermal energy

electric energy

potential energy

internal energy

Reactant P contains 50 J of energy, and reactant Q contains 35.3 J of energy. The reactants combine to form product PQ, which contains 104 J of energy. What is the energy transformation?

Energy is absorbed because the product has more energy than the reactants have.

Energy is absorbed because the product has less energy than the reactants have.

Energy is lost because the product has more energy than the reactants have.

Energy is lost because the product has less energy than the reactants have.

Which statement describes mechanical energy?

the energy that is stored in chemical bonds

the energy that is associated with temperature

the sum of the kinetic energy and the potential energy of an object

the type of energy that is associated with electromagnetic radiation

Which statement describes the law of conservation of energy?

All systems will exchange matter and energy with their surroundings.

All systems can exchange energy, but not matter, with their surroundings.

Energy cannot be created nor destroyed, but it changes from one form to another.

Energy is destroyed in most chemical reactions when new products are formed.

A book is falling from the top shelf of a bookcase. Which statement correctly describes the change in the energy of the book?

The potential energy and kinetic energy remain the same.

The potential energy decreases as kinetic energy increases.

The kinetic energy decreases as potential energy increases.

The kinetic energy remains at zero, but potential energy increases.

The table shows the dimensions of four wedges.

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Unit 4: Test Answers

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