The rougher the surface, the more _______ there will be.
What is friction.
100
What are three good conductors of electricity?
What are copper, silver, human body, water
200
This force is created by the flow of electrons.
What is electricity.
200
Man invented simple machines to eliminate (get rid of) work. True or false.
What is false. We use them to make work easier.
200
This is considered one of the greatest inventions of all time. A doorknob is an example.
What is a wheel and axle.
200
How does an electromagnet work?
It uses an electric current to make the strength of the magnets stronger.
200
An object will move in what direction when a force is applied?
The direction of the greater net force.
300
In magnetism, forces ______________ or ______________.
What is repel or attract.
300
Which simple machine is used to hold two things together?
What is a screw.
300
An arm or leg is an example of this. The elbow would be the fulcrum.
What is a lever.
300
Where are two places we commonly find magnets today?
What is a credit card, automatic door openers, computer and tv screens, motors and generators, and the number one use: COMPASS!
300
We measure a net force in ...
What is newtons.
400
This is a force that causes things to slow down or come to a stop.
What is friction.
400
What are three insulators of electricity?
What are rubber, glass, wood
400
What simple machine uses a grooved wheel and rope/cable to make lifting easier?
What is a pulley.
400
The energy you need to move an object is called...
WORK.
400
This invisible force pulls things down to the center of the earth.
What is gravity.
500
When the forces are balanced, we say the objects are in a state of ....
equilibrium (object will not move).
500
The more _______ an object has, the more force you need to move it.
What is mass.
500
A scissors, knife, or axe are examples of this simple machine.
What is a wedge.
500
What is a simple machine?
A machine with few or NO moving parts that makes work easier.
500
Newtons first law of motion states that an object in motion will stay in motion and an object at rest will stay at rest unless acted upon by an unbalanced force. This is sometimes called the law of...