Unit 4.1 Forces

Multiple Choice

The area of magnetic force around a magnet is known as its _____________.

• magnetic field

• magnetic declination

• magnetic fan lines

• magnetic tan lines

Multiple Choice

These magnets would....

• Repel

• Attract

Multiple Choice

As the magnets get farther apart, the strength of the fields get.....

• Weaker

• Stronger

• Stay the same

Multiple Choice

Moving a magnet near a compass can cause the compass needle to move, even though the magnet does not touch the compass. This observation is evidence for which characteristics of magnetic fields?

• There is a north and south pole on a magnet.

• Fields can exert non-contact forces.

• Magnetic fields do not exist.

Multiple Choice

Electric currents are created by _______ magnetic fields.

• Moving

• Non-moving

Multiple Choice

Protons have a ____________ charge and Electrons have a _______________ charge.

• Positive, Positive

• Positive, Negative

• Negative, Positive

• Negative, Negative

Multiple Choice

Which statement is true about both magnetic and electric fields?

• Like charges repel each other

• Like charges attract each other

• Like poles attract each other

Multiple Choice

What is a material through which electrons cannot move easily?

• Conductor

• Insulator

• Magnet

• Circuit

Multiple Choice

Electrical conductors have ____ resistance to the movement of electrons.

• High

• Low

Multiple Choice

What is the cause of electricity?

• Magnetism

• Gravity

• Moving Electrons

• Lightning

Multiple Choice

Which shows electric field lines?

• A

• B

• C

Multiple Choice

Which of the diagrams shows the least gravitational force?

• I

• II

• III

• IV

Multiple Choice

Which of the following forces is attractive but never repulsive?

• Gravitational Force

• Electric Force

• Magnetic Force

• Electromotive Force

Multiple Choice

Which shows gravitational field lines?

• A

• B

• C

Multiple Choice

What makes an electromagnet stronger?

• Increasing the number of coils in the wire

• Decreasing the number of coils in the wire

• Decreasing the electric current

• Decreasing the voltage

Multiple Choice

In an electromagnet, coils of wire are wrapped around a magnetic object to generate a magnetic field. What the is relationship between number of coils and the strength of the magnetic field?

• The more coils an electromagntic has, the stronger the magnetic field

• The more coils an electromagntic has, the weaker the magnetic field

• The larger the metal object, the stronger the magnetic field is

• There is no relationship between number of coils and the strength of a magnetic field

Multiple Choice

What two forces are required for generators and electric motors to work? 

• magnetism and thermal 

• electricity and thermal 

• electricity and magnetism 

• magnetism and radiant 

Multiple Choice

Generators are devices that convert _____ energy into _____ energy.

• chemical; mechanical

• mechanical; electrical

• electrical; mechanical

• potential; kinetic

Multiple Choice

In a _______ a spinning turbine moves magnets which generates an electric current.

• Motor

• Generator

Multiple Choice

How are electromagnets different from magnets?

• magnets can be turned on/off

• you can turn an electromagnet on/off

• magnets are more powerful

• magnets have a North and South pole

Multiple Choice

What is the transfer of energy in when you plug in a motor and it spins?

• chemical to mechanical

• electrical to mechanical

• mechanical to electrical

• physical to potential

Multiple Choice

What type of energy comes OUT of a generator?

• Mechanical

• Electrical

• Thermal

• Potential