Unit 3 - Lesson 1 Quiz - Energy Flows and Causes Change

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1. A scientist performed an experiment during which she measured the energy transferred in each step of her experiment. The total quantity of energy transferred in all of the steps was less than the amount she measured at the beginning. What is the most likely explanation for this result?

• Energy was destroyed during certain steps in the experiment.
• The steps in the experiment required more energy than was available.
• The experiments created energy that was then used up at a faster rate.
• Some energy was transformed into unwanted heat or sound that was not detected.

2. A hockey player uses her stick to hit a hockey puck. Which statement describes the energy transfer?

• Energy is transferred from the stick to the puck.
• Energy is transferred from the player to the puck.
• Energy is transferred from the puck to the player.
• Energy is transferred from the stick to the player.

3. The picture shows a spring toy moving down steps. What happens to the energy of the toy?

• The potential energy of the toy is greatest while the toy is falling.
• The kinetic energy of the toy is greatest when the toy is finished falling.
• Some kinetic energy of the toy changes to potential energy as the toy falls down the steps.
• Some of the potential energy of the toy changes to kinetic energy as the toy falls down the steps.

4. A cold block of metal is placed in contact with a warm block of metal. Which type of energy will be transferred between the blocks?

• thermal energy
• chemical energy
• electrical energy
• mechanical energy

5. What energy transformation takes place when a hair dryer is used?

• Energy from the sun is transformed to chemical energy.
• Sound energy is transformed to thermal energy and electrical energy.
• Electrical energy is transformed to thermal energy and sound energy.
• Thermal energy is transformed to sound energy and mechanical energy.

6. Some people use solar water heaters in their homes. A tank is attached on the roof, where the sun warms the water in the tank. Pipes transfer water from the tank to the taps in the home. Which statement describes the energy transfer that occurs after the water in the tank is already heated and is used?

• Solar energy from the sun becomes thermal energy in the water inside the tank.
• Thermal energy becomes kinetic mechanical energy as the water moves through the pipes.
• Kinetic energy from the sun becomes potential energy when the tap is opened and water warms as it moves.
• Gravitational potential energy becomes kinetic energy when the tap is opened and water moves through the pipes.

7. While on vacation, Carine rides in a hot-air balloon. To make the balloon rise, the pilot turns on a flame to warm the air inside the balloon. Which of these best describes the change in energy that makes the balloon rise?

• solar energy to thermal energy
• thermal energy to potential energy
• chemical energy to thermal energy
• gravitational energy to kinetic energy

8. What is energy transfer?

• The measure of an object's ability to do work or cause changes in its surroundings.
• The process of energy changing from one form to another
• The potential energy stored in an object due to its position or configuration.

9. What is the law of conservation of energy?

• The law of conservation of energy states that energy can be created but not destroyed or transferred.
• The law of conservation of energy states that energy can be destroyed but not created or transferred.
• The law of conservation of energy states that energy can be created or destroyed, but not transferred or transformed.
• The law of conservation of energy states that energy cannot be created or destroyed, only transferred or transformed.