Simple Machines, Work and Circuits

Electric circuits provide energy for lightbulbs. Which of these prevents the flow of electrons?

• a closed circuit

• a series circuit

• a parallel circuit

• an open circuit

Which diagram shows the most work being done as a force is applied to the box?

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The diagrams show force being applied to two objects. Which conditions indicate that work was NOT done?

• X because the box moved

• X because the box had less mass and more force than Z

• Z because the box had more mass and less force than X

• Z because the box was pushed by 2 equal forces

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

A student builds this electric circuit and realizes that turning off one light turns off all of the lights. What should she do so each light can be turned on and off separately?

• Convert it into a closed circuit

• Convert it into a series circuit

• Convert it into a parallel circuit

• Convert it into an open circuit

Which diagram shows 3 resistors connected in series?

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Energy is transferred through an electrical circuit through

• static electrons

• moving electrons

• moving protons

• static protons

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NGSS.MS-PS3-5

As Penelope entered a dark room, she pushed the switch on the wall to turn on the light. What makes the light turn on when Penelope pushes the switch.

• electricity

• friction

• gravity

• magnetism

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NGSS.MS-PS2-3

Which of the diagrams show the correct way to set up a circuit so that the bulb will light?

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NGSS.4-PS3-2

NGSS.4-PS3-4

Students used rulers as levers during an investigation of simple machines and forces. They made the arms of the levers different lengths by how they placed the ruler on the table. They put a box at the end of the ruler.

Which ruler would require the greatest force to lift the box off the table?

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Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which best explains how a manual can opener makes opening a can easier?

• The surface area of the can decreases.

• The force applied to the can increases.

• The friction keeping the can sealed decreases.

• The amount of gravity acting on the can decreases.