forces with fields

Multiple Choice

The best definition of a magnet...

• to create electricity from movement

• any material that has domains

• any material that attracts iron

• the energy an object has due to its chemical composition

Multiple Choice

the purpose of an electric motor is..

• to create movement from electricity

• to increase the amount of energy in power lines

• to create movment from fuel

• to create electricity from movement

Multiple Choice

A book sitting on the top shelf has

• kintetic energy

• elastic potential energy

• chemical potential energy

• gravitational potential energy

Multiple Choice

magnetic fields are strongest

• at the north pole of a magnet only

• at the north and south poles of a magnet

• around the outside of a magnet

• along the equator of a magnet

Multiple Choice

If you imagine Earth as a giant bar magnet, which of the following would be true?

• The geographic poles are the same as the magnetic poles

• earths magnetic fields is the strongest at the equator

• The geographic north pole is actually near the magnetic south pole

• earth doesnt have a very strong magnetic field

Multiple Choice

which of the following has elastic potential energy?

• A slingshot is pulled back, ready to launch

• A car driving down the street

• a battery which contains chemicals that can be turned into electricity

• the north poles of two magnets repelling each other

Multiple Choice

a 9000 kg semi truck and a 1000 kh car are traveling the same velocity along the highway. Which of the following statements is true?

• the car has more pe than the semi truck

• the semi truck has the same amount of kinetic energy as the car

• The semi truck has more ke than the car

• the car has more ke than the semi truck

Multiple Choice

charge happens when....

• gains or loses protons

• gains or loses electrons

• comes in contact with balloon

• is struck by lightning

Multiple Choice

static electricity is..

• the build up of charge in an object

• electric discharge

• an object at rest will stay at rest unless acted upon a unbalanced force

• the combination of all forces acting on an object

Multiple Choice

magnetic fields are strongest..

• around the outside of a magnet

• at the north and south poles of a magnet

• at the north pole of a magnet only

• along the equator of a magnet

Multiple Choice

any material can become magnatized when...

• it is heated up

• it is made of aluminum

• the domains are aligned in the same direction

• it becomes very dense

Multiple Choice

which of the following factors can affect the strength of a charged object's electric field?

• the mass of the object and the distance from another charged object

• the amount of charge and density of the particles

• the amount of charge and distanse from another charged object

• the amount of charge and the mass of the object

Multiple Choice

the sun has a greater gravitationl pull than earth. If this is true, why are we standing on earth rather than the sun

• the moon keeps us in earths gravitational field

• we are closer to the earth than we are to the sun

• we could burn up if we got too close to the sun

• the earth has less mass than the sun

Multiple Choice

what 2 factors affect the gravitational pull between two objects?

• the number of electrons and the mass of the objects

• the distance between the objects and the magnetic field

• the mass of objects and their charge

• the mass of objects and the distance between them

Multiple Choice

the purpose of an electric semiconductor?

• to allow charge to flow but to control how much

• to allow charge to flow freely

• to stop charge from electrocuting a person

• to charge an electronic device, like a cell phone

Multiple Choice

what happens to electrons after they leave an object through friction?

• the electrons float onto another object

• the electrons are destroyed

• the electrons are transfered to the balloon

• the electrons dont go anywhere, they just stay where they are.

Multiple Choice

why are cords of household appliances covered in plastic?

• it helps the electricity flow through the wires faster

• it serves as an electric conductor

• it serves as an electric semiconductor

• it serves as an electric insulator

Multiple Choice

which statement describes the weight of a horse?

• weight is the total amount of matter in the horses body

• weight is the gravitational force of attraction between earth and the horse

• weight is the resistance to a change in the horses motion

• weight is a property of thr horse that remains the same from planet to planet

Multiple Choice

what kind of energy does a swinging hammer transfer to a nail?

• kinetic energy

• chemical potential energy

• elastic pe

• gravitational potential energy

Multiple Choice

an electric generator is...

• to increase the amount of energy in powerlines

• to create movement from electricity

• to create movment from fuel

• to create electricity from movement

Multiple Choice

which of the following is a property that is unique to electromagnets?

• they are helpful for converting electrical energy into mechanical energy

• they are permanetly magnatized

• they have a north and south pole

• They can be tured on/off by switching the electric current on and off

Multiple Select

wind turbines converting kinetic energy from wind into electrical energy:

• generator

• motor

• generator

• motor

Multiple Select

an electric drill that uses electrical energy to spin the drill bit

• generator

• generator

• motor

• motor

Multiple Select

electrical toothbrushes that use electricsl energy to move the bristles on your toothbrush

• generator

• motor

• motor

• generator

Multiple Select

hydroelectric dams converting kintetic energy from a river into electrical energy

• motor

• generator

• motor

• generator