Airbag Safety Quiz

An airbag is used to safely decrease the momentum of a driver in a car accident. Which of the following are true about how the airbag protects the driver? Select TWO correct answers.

• The airbag has flexibility which helps reduce the effects of the impact force.

• The airbag decreases the distance over which the force acts on the driver.

• The airbag increases the rate of acceleration of the driver.

• The airbag decreases the mass of the driver.

• The airbag increases the length of time the force acts on the driver.

Charles de Coulomb measured attractive and repulsive forces caused by charged objects. Which statement is true about the electromagnetic force?

• Only the charge of one object that is interacting with another charged object affects the electromagnetic force between the two objects.

• The distance between two charged objects has no effect on the electromagnetic force between the two objects.

• The charge between two charged objects has no effect on the electromagnetic force between the two objects.

• The charge and distance between two charged objects both influence the electromagnetic force between the two objects.

Which set of objects from the table below could be used together to induce a magnetic force?

• A, B, and D

• A, C, and F

• A, B, and F

• A, C, D, and E

A circular loop of 100 turns of wire rotates in a magnetic field. The current in the generator can be increased by changing which of the following?

• reducing the area of the loops of wire

• increasing the number of loops of wire in the generator

• switching out the magnet for one with a smaller magnet field

• decreasing the rate at which the loops rotate in the magnetic field

Which of the following statements describes how a generator functions?

• A generator changes the voltage of a circuit by changing the magnetic flux.

• A generator stores electrical energy and discharges it when prompted.

• A generator uses physical work to rotate magnets, thereby inducing an electrical current.

• A generator uses electrical energy to generate a magnetic field that causes physical work.

Which of the statements below describes how a motor operates?

• A motor works by changing the magnetic flux to change the voltage of a circuit.

• A motor works by electrical energy moving a charge through a loop in a magnetic field, causing the loop to rotate.

• A motor works by rotating a magnet in order to generate electricity.

• A motor works by using physical work to push a charge through a loop, generating a uniform magnetic field.

What is a magnetic pole?

• one of the two opposite ends of a magnet

• the energy that an object has because it is moving

• an object or diagram that helps us understand something by making it simpler or easier to see

• a line that connects opposite magnetic poles and represents the strength and direction of the magnetic field

Which of the following is an example of the electromagnetic force?

• The Earth rotating around the Sun

• Protons and neutrons being bound to a nucleus

• The radioactive decay of subatomic particles

• A current carrying wire

Two charged spheres are 20 cm apart and exert an attractive force of 8 x 10^-9 N on each other. What will the force of attraction be when the spheres are moved to 10 cm apart?

• 1.6 x 10^{-8} N

• 3.2 x 10^{-8} N

Like charges ______ and opposite charges ______.

• attract, repel

• repel, attract

• repel, repel

• attract, attract