Energy Pre-Assessment

Objects of different masses are suspended from a height. Which combination of features will have the greatest gravitational potential energy?

• 1. low mass and low height

• 1. low mass and high height

• 1. high mass and low height

• high mass and high height

Rubbing two wooden sticks together can sometimes result in a fire. What would increase the probability of a fire starting?

• 1. using longer sticks.

• rubbing the sticks together more quickly

• 1. holding the sticks higher off the ground

• all the choices given

Which statement most accurately describes the Law of Conservation of Energy?

• Energy cannot be created or destroyed, but it can be changed from one type to another

• 1. Energy is created from the Earth and is destroyed when we use it.

• 1. Energy should be saved (conserved) for use in the future.

• 1. All forms of energy can be classified as either potential or kinetic.

What energy transformation takes place when a radio is plugged in and turned on?

• 1. kinetic to potential

• wire to radio waves

• electrical to sound

• 1. battery to motion

The following methods will melt an ice cube quickly, except

• 1. hold it in your hand and change hands when one hand gets cold.

• 1. put it in a glass of room temperature water.

• 1. break it into pieces and warm up the pieces.

• put it in an insulating container

Jose had a 200 mL cup of hot chocolate that was 95° Celsius which was too hot to drink. His mother suggested he add some cold milk to cool it off so he added 50 mL of milk which was 5° Celsius. What was the approximate temperature of Jose’s hot chocolate?

• 1. 75° Celsius

• 1. 95° Celsius

• 1. 25° Celsius

• 1. 5° Celsius

The amount of thermal energy that can be stored in an object depends on:

• 1. its mass.

• 1. the energy supplied.

• 1. the type of substance.

• all the choices given

Which of the following is an example of chemical energy being transformed into thermal energy?

• 1. A light is switched on.

• 1. A ball drops.

• A match is burned.

• 1. An electric fire is switched on.

Energy from the Sun reaches the Earth through a type of energy transfer known as:

• 1. absorption

• 1. conduction

• convection

• radiation

If you placed an object that was 90 degrees Celsius in a room that is 25 degrees Celsius, which of the following statements is correct?

• 1. The air in the room will cool down the hot object.

• Thermal energy from the hot object will be transferred from the object to the air in the room.

• 1. The temperature of the room and the object will stay the same.

• 1. The air will lose thermal energy in an equal amount to the thermal energy gained by the hot object.