When charging objects by induction, which of the following must be true?

• A path to ground is not needed when using a positive source.

• The objects being charged must be conductors.

• The objects takes on the same charge as its source.

• The source looses some of its charge.

In which circuit does the ammeter (placed at point A) show the greatest current? Build the circuit in PHET. (*Hint .... Current = Voltage/Resistance )

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What does the c mean in e=mc^2?

• speed of light

• specific heat

• energy

• mass

A current of 4 A flows through a 20 V car headlight bulb. Calculate the electric power. (*Hint...Look at your formula page to solve for electrical power.)

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  80 W

• 200 W

• 2.5 A

• 4.55 A

Which diagram best illustrates wave refraction?

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Tags

NGSS.HS-PS4-1

Which of the following is a unit of electric current?

• Watt

• Ampere

• Ohm

• Volt

What is the primary function of a resistor in an electrical circuit?

• To increase voltage

• To store energy

• To limit current

• To convert AC to DC

Which of the following materials is a good conductor of electricity?

• Wood

• Copper

• Glass

• Rubber

Tags

NGSS.HS-PS2-5

In the diagram, a 60.-kilogram rollerskater exerts a 10.-newton force on a 30.-kilogram rollerskater for 0.20 second. What is the magnitude of the impulse applied to the 30.-kilogram rollerskater?

• (50. N•s

• 6.0 N•s

• 12 N•s

• 2.0 N•s

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

A 3.0-kilogram steel block is at rest on a frictionless horizontal surface. A 1.0-kilogram lump of clay is propelled horizontally at 6.0 meters per second toward the block as shown in the diagram. Upon collision, the clay and steel block stick together and move to the right with a speed of ___.

• 1.5 m/s

• 2.0 m/s

• 3.0 m/s

• 6.0 m/s

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2