Forces and Motion
Gravity is an example of which kind of force?
Non-contact
True or False
When you push a pole downward on Earth to make a pole vault, Earth exerts an equal force on the pole.
True
What charge do electrons have?
An example of an insulator is
Rubber
Which sides repel one another?
Alike sides
Forces that are equal in size but opposite in direction are called what type of forces?
Unbalanced
Acceleration depends on which two factors?
Force and Mass
What is found on the inside of an atom?
Protons and Neutrons
A material through which electrons can move easily is a _____.
Conductor
The location of the strongest magnetic field is the ____.
Magnetic poles (or the ends)
Motion can be described through a change in _____
Position
According to Newton's second law of motion, a larger force acting on an object causes a greater _________ of that object.
Acceleration
If Helium has an atomic number of 2 how many electrons are there?
2
An electric field gets stronger as you ____.
Get closer
True or False:
The magnetic domains of a permanent magnet are arranged randomly.
False
Lizzie is pushing Alex on a scooter. Lizzie is pushing with 75 N of force to the left, and Alex is helping with 20 N to the left. What is the net force on the scooter?
95N to the left
What is Newton's 1st Law of Motion?
An object in motion stays in motion
How can you get a neutrally charged atom?
More neutrons than protons on the inside
What charge is an electrically charged atom?
Negatively
The region around a magnet where the magnetic forces act is the ____.
Magnetic field
Mass and weight are different. Mass depends on _____. Weight depends on _____.
Gravity; Mass
Based on Newton's third law of motion, when a person on a skateboard throws a heavy concrete block to the north, the person will be pushed to what way?
South
Which of the following is an atom that has lost an electron?
True or false
An electromagnet is a current-carrying wire wrapped around a copper core.
False, it is an iron core
A compass needle acts as a(n)
Magnet