Magnetic Forces
What happens to the strength of a magnetic force when two magnets are moved closer together?
What is The force becomes stronger
What type of energy is stored in a stretched rubber band?
Potential energy.
What creates the magnetic field in an electromagnet?
The electric current flowing through the wire
What happens to light when it hits a mirror?
It reflects
What is the distance between two peaks of a wave called?
Wavelength.
What do the magnetic field lines indicate when two north poles are facing each other?
They spread outward, showing repulsion.
Which has more potential energy: a ball at the top of a hill or halfway down?
The ball at the top of the hill, because it’s at a greater height.
How can you increase the strength of an electromagnet?
Add more coils of wire or increase the electric current.
What is the term for light passing through a material like glass?
Transmission
Which wave property determines its brightness or energy?
Amplitude.
Which magnet has a stronger force: one that moves a paperclip from 5 cm away or one that moves it from 2 cm away? Why?
The magnet that moves the paperclip from 5 cm away, because the force acts over a greater distance.
Which example demonstrates a system gaining potential energy:
A. A soccer ball rolling across a field.
B. A marshmallow resting on a toy catapult.
B. A marshmallow resting on a toy catapult.
What happens to an electromagnet when you turn off the current?
It loses its magnetic field
What happens to light when it enters a prism?
It refracts and separates into a spectrum of colors.
If a wave’s frequency increases, what happens to its wavelength?
The wavelength decreases.)
If the distance between two magnets increases, what happens to the density of the magnetic field lines?
The field lines become less dense, indicating a weaker magnetic force.
What happens to potential energy when an object begins to move?
It converts into kinetic energy.
How does reversing the current in an electromagnet affect its magnetic field?
The magnetic field reverses direction.
Why does ultraviolet light cause more damage to materials than visible light?
Ultraviolet light has more energy due to its shorter wavelength
Which type of electromagnetic wave has the shortest wavelength?
Gamma rays.
Why does repulsion occur when the north poles of two magnets face each other?
Like poles repel each other because they have the same magnetic charge.
Describe a system where both potential and kinetic energy are present at the same time.
A pendulum in motion—at its highest point, it has potential energy, and as it swings, it gains kinetic energy.
Describe one practical use of an electromagnet.
Lifting heavy metals in junkyards, in MRI machines, or in electric motors.
How does the color of an object affect the light it reflects?
It reflects the color you see and absorbs all other colors.
Why does increasing a wave’s amplitude increase its energy?
Amplitude is directly related to the wave’s energy.