Magnetic and Electromagnetic Forces

Which of the following is an example of the results of a magnetic force?

• Orbit of planets around the Sun

• Movement of a compass needle

• Particles of dust sticking to a balloon

• A turbine rotated by moving water

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NGSS.MS-PS2-3

The primary function of a motor is to convert –

• Electrical energy into radiant energy

• Radiant energy into useful energy

• Mechanical energy into light energy

• Electrical energy into mechanical energy

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NGSS.MS-PS3-5

Which action makes use of a magnetic force

• A person puts a bank card in an electronic reader to buy an item

• A store clerk finds the price of an item by moving the item over a laser light

• A parent meausures a child's temperature by toching a thermometer to the child's head

• A student measures the mass of a book using a spring scale

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NGSS.MS-PS2-3

The picture shows a balloon and a portion of a wall with a neutral charge. If a student rubs abainst his or her hair, giving the balloon a negaive charge, which image correctly shows how the charges in the balloon and wall will be arranged?

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A teacher gives a student a battery, a copper wire, an iron nail, and some iron filings. Using these materials,

what type of force could the student produce?

• A magnetic force, but not an electric force

• Neither a magnetic force no an electric force

• An electric force, but not a magnetic force

• Both an electric force and a magnetic force

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Which of the following occurs due to an electric force?

• An iron nail moves toward a bar magnet after the two are placed close to each other.

• A laboratory cart rolls across the floor after it is pushed by a student.

• A plastic comb attracts a small piece of paper after it is used to comb someone's hair.

• A steel ball falls vertically to the ground after it is released from a height.

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A student is asked to describe an example of a magnetic force in everyday life using an object found in the

student's home. Which of the following objects would most likely be best for the student to use?

• A battery-operated toy car

• A table with a vase on top of it

• A refrigerator with objects stuck to the door

• A calculator powered by sunlightMamam

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NGSS.MS-PS2-3

Which of the following familiar occurrences is due to magnetic force?

• The needle of a compass points towards Earth's North Pole

• A person gets a shock from a doorknob after walking across the carpet

• Earth is constantly pulling all objects towards its center

• Pieces of clothing stick together after being in a clothes dryer

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NGSS.MS-PS2-3

The electric force between two charged spheres can be increased by decreasing the–

• Combined mass of both spheres

• Distance between the spheres centers

• Diameter of the larger of the spheres

• Combined charge of both spheres

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NGSS.MS-PS2-3

A charged object exerts a force on another charged object. If the charge on each

object is doubled, the force will becomes−

• One quarter of its orignal value

• Half of its original value

• Double its original value

• Four times its original value

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