Magnetic Force
A scientists has two repelling magnets. If they want magnetic force to become stronger, what should they do?
Push them closer together
What flows through a wire to create an electromagnet?
An electric current
What does NOT affect magnetic force in an electromagnet?
A. Electric current
B. Number of coils
C. Distance
D. Color of the wire
D. Color of the wire
Launch speed increases when magnets are close together because magnetic force increases this type of energy
Potential
What is the name of the variable that the scientist changes in the experiment?
Independent
What do like poles do when placed near each other?
Repel
If you cannot change the coils on an electromagnet, how can you change the battery to increase the strength?
A. Use a smaller one (less voltage)
B. Use a larger one (more voltage)
B. Use a larger one (more voltage)
Which change would weaken the magnetic force?
A. Increasing coil number
B. Increasing current
C. Moving magnets farther apart
D. Using a stronger battery
C. Moving magnets farther apart
Which situation would store the most potential energy in the magnetic field?
A. Magnets far apart + few coils
B. Magnets close together + many coils
C. Strong magnets but zero current
D. Many coils but very weak battery
B. Magnets close together + many coils
What is the name of the variable the scientist MEASURES in the experiment?
Dependent
What do OPPOSITE poles do when placed close together?
Attract
If a student cannot change the battery, they can still strengthen an electromagnet by increasing the number of...
Coils
What pattern best explains why launch speed increases as coil number increases?
A. More coils → weaker magnetic field → higher speed
B. More coils → stronger magnetic field → more stored energy
C. Fewer coils → stronger magnetic force → faster launch
D. Coil number does not affect magnetic force
B. More coils → stronger magnetic field → more stored energy
What happens to launch speed when magnets are moved farther apart?
Slows down / decreases
What is the name of the variable that the scientist keeps the same during all tests?
Control
What creates the pattern of magnetic field lines around magnets?
A. Direction of magnetic force
B. Heat flow through the magnet
C. Gravity pulling on the coils
D. Amount of friction in the system
A. Direction of magnetic force
To identify the poles of a magnetized nail, a student should…
A. Measure the nail’s mass
B. Change which end faces another magnet
C. Replace the nail with a screw
D. Change the shape of the tube
B. Change which end faces another magnet
A student forgot to record the magnetic force for 50 coils. The force at 30 coils is 6 N; 40 coils is 9 N; at 60 coils it is 12 N. What is the most reasonable guess for the force with 50 coils?
10 N or 11 N
What happens to magnetic force as distance decreases?
It increases
What is the dependent variable in a launch-speed test?
A. Magnetic field strength
B. Number of coils
C. Launch speed
D. Size of the launcher
C. Launch speed
Increasing magnetic force increases what type of energy stored in the launcher system?
Potential
What does an electric current do in an electromagnet?
Creates a magnetic field
What best explains why the increase in force slows down at higher coil numbers?
A. There is less space to add coils
B. The magnet becomes too heavy
C. The magnetic field begins to level off
D. Electric current stops flowing
C. The magnetic field begins to level off
Draw a picture of a launcher system that would maximize launch speed. Include: poles, magnet strength, and magnet distance. Don't forget the field lines :)
I'll check
A student wants to see how the number of coils affects launch speed. What is the independent variable and what is the dependent variable? YOU MUST INCLUDE BOTH.
Independent: Number of coils
Dependent: Launch speed