Electric Charge
WRONG ANSWER = -100
What are the two types of electric charge?
Positive and negative
Where is magnetic force strongest on a magnet?
The poles
What is a solenoid?
A coil of wire that creates a magnetic field when current flows
Gravity is a ____________ force.
Noncontact
WRONG ANSWER = -100
What keeps planets in orbit around the Sun?
Gravity
WRONG ANSWER = -200
What happens when two objects have the same type of charge?
They repel
WRONG ANSWER = -200
Name one ferromagnetic material.
Iron, nickel, or cobalt
Name one change that makes an electromagnet stronger.
Add loops, increase current, or add iron core
DOUBLE POINTS:
What two factors affect gravitational force?
Mass and distance
Who developed the Law of Universal Gravitation?
Isaac Newton
Rubbing a balloon on your hair causes what to build up?
Static electricity
What are magnetic domains?
Groups of atoms with aligned magnetic fields
DOUBLE POINTS:
What happens if you reverse electric current in an electromagnet?
The poles reverse
What is the difference between mass and weight?
Mass stays the same; weight depends on gravity
WRONG ANSWER = -300
Name all the planets in order from closest to farthest away from the sun.
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
DOUBLE POINTS:
Why does a charged balloon stick to a neutral wall?
The negative charges in the balloon causes the negative charges in the wall to repel, leaving the positive charges.
WRONG ANSWER = -400
Give three (3) real-life examples of magnets being used.
Speakers, motors, compasses, fridge magnets, scrapyard cranes, MRI machines, jewelry.
Why are electromagnets useful in scrapyards?
They can be turned on/off to lift or drop metal
Name one adaptation humans would have to make in order to eat on the moon where gravity is weaker.
Use squeeze packets or magnetic utensils to hold food, use straws with one-way valves to prevent spills, use Velcro trays or sticky surfaces
What did the Cavendish experiment accomplish?
Confirmed Newton’s law of universal gravitation with real measurements.
It calculated Earth’s mass and gravity constant.
What is the region around a charged object called?
Electric field
Why doesn’t an unmagnetized iron bar act like a magnet?
Its domains point in different directions
Explain how electric current and magnetism are related.
Electric current creates a magnetic field
Why are large planets and moons spherical?
Gravity pulls matter equally from all directions
Explain what you would need to do in order to get a feather and an apple to hit the floor at the same time if dropped at the same height.
Create a vacuum where air resistance is no longer a factor.