Forces
A 20 kg crate is pushed with a force of 100 N, but the frictional force is 60 N. What is the net force acting on the crate?
40 N
What metal/material is typically a magnetic material?
iron (or steel)
What three elements/items are needed in a circuit?
source of energy (battery), something to transfer energy (wire), device that uses energy
How could you increase the strength of an electromagnet?
add more coils, coil tighter, overlap wires, increase power source (battery)
What device converts electrical energy into mechanical energy using electromagnetism?
Motor
A box weighing 50 kg is pushed across a floor with a force of 200 N. If the frictional force opposing the motion is 150 N, what is the net force acting on the box?
50 N
What happens to the strength of a magnet as you move further away from it?
It decreases
Orsted made the discovery that electric current creates a
magnetic field
What is the role of a magnetic field in an electric generator?
It helps to create electricity through electromagnetic induction
What is the flow of electricity in a motor?
__ -> __ -> __
PE --> EE --> KE
A person pushes a shopping cart with a force of 100 N to the right, while friction acts to the left with a force of 40 N. What is the net force on the cart?
60 N to the right
If you break a magnet in half, what will happen to the two pieces?
Each piece will become a smaller magnet with its own north and south poles
If the current in the wire increases, what happens to the strength of the magnetic field?
increases
What two types of magnet are commonly used in electric motors?
Permanent magnet and electromagnet
What is the flow of electricity in a generator?
__ -> __ -> __
KE --> EE --> KE/PE
A cyclist is pedaling uphill and exerts a force of 250 N. If the frictional force acting against them is 100 N, what is the net force acting on the cyclist?
150 N uphill
What happens to the magnetic field of an electromagnet when the electric current is turned off?
It disappears
What is the primary function of a switch in a circuit?
To control the flow of electricity (turn on/off)
How does electromagnetic force differ from static electricity?
Static electricity is a stationary charge, while electromagnetic force involves moving charges
What is the typical material used for the commutator?
Copper
A car is parked on a hill. What forces are acting on the car?
Gravity and normal force
On a subatomic level, what is the primary reason that some materials can be magnetized while others cannot?
The arrangement of atoms in the material
What is the relationship between magnetic fields and electric currents?
Magnetic fields are induced by electric currents
What is electromagnetic induction?
The generation of an electric current by a changing magnetic field
What is the primary function of the commutator in a motor?
Switch electromagnets on and off to rotate/reverse the direction of energy flow and alternate electromagnets (to rotate the motor)