STAAR Gazing: Force, Motion, Energy Unit 2

Examples of objects that use different types of energy to perform their functions are shown. Which examples use mechanical energy to perform their functions?

• Examples 1, 2, and 4

• Examples 1, 3, and 4

• Examples 1 and 2 only

• Examples 3 and 4 only

A science class is observing a pet turtle in a small plastic pool. The students turn on a portable camping lamp that is clamped on to a counter next to the pool. Which kind of energy is used by the portable lamp to produce light?

• Mechanical energy, because the lamp is clamped on to the counter

• Thermal energy, because the lamp increases the temperature of the water

• Electrical energy, because the lamp is battery-operated

• Sound energy, because the lamp vibrates when clicked on

A student uses the setup shown to investigate ways to speed up evaporation. Which forms of energy are being compared in the student's investigation?

• Light energy and electrical energy

• Mechanical energy and electrical energy

• Light energy and thermal energy

• Mechanical energy and thermal energy

The photograph shows a laser cutting a sheet of metal as the laser moves from one end of the metal to the other. Four groups of students each made a table of examples of the different types of energy involved in this process. Which of these tables is correct?

• Table F

• Table G

• Table H

• Table J

Eight activities that use energy are listed in the box. Each of these activities requires the use of which kind of energy?

• Thermal

• Mechanical

• Electrical

• Sound

A student recorded the time it took for all the water in a puddle on a sidewalk to evaporate after a rain. Which kind of energy causes water to evaporate?

• Light energy from streetlights

• Sound energy from passing cars

• Thermal energy from the environment

• Mechanical energy from nearby streets

A student constructs the circuit shown for a science demonstration. With the switches in these positions, which lights are on?

• All the lights

• Lights 1 and 2 only

• Lights 3 and 4 only

• None of the lights

Which circuit shown will produce light when the switch is closed?

• Circuit A

• Circuit B

• Circuit C

• Circuit D

A student wants to build a circuit with four lightbulbs and one bell. The student wants to place a switch in the circuit so that only one light will still be on and the bell will still ring when the switch is opened. Which of these circuits should the student build?

• F

• G

• H

• J

A student builds a circuit allowing the lightbulbs to light, the buzzers to make sound, and the motors to turn. Which two switches can be open and still allow all of the parts to work?

• Switches 1 and 3

• Switches 1 and 4

• Switches 2 and 3

• Switches 3 and 4