Forces
What is a force?
A force is a push or a pull
Rubbing your hands together to create heat is an example of what force?
Friction
To pull something closer
Attract
Device that uses magnetic forces to show to the Cardinal Directions
Compass
An object changing position is said to be in ______
Motion
A force that occurs between the surfaces of two objects that are touching.
Friction
To push away: oppose
Repel
Type of train that uses magnetic forces to decrease friction
Maglev Train
When equal forces act on an object and produce no change in the objects motion
Balanced forces
A push or pull between two objects that are touching each other.
" friction is a _________ _____________"
Contact force
A material that applies the force of magnetism
Magnet
What force can be used to pick up metal items at the bottom of a lake or stream?
Magnetism - Example, magnet fishing
A force that pulls objects towards the Earth's surface
Gravity
Substance that reduces friction between objects in contact.
Example : Motor oil added to an engine
Lubricant
A force that can push or pull on some materials without touching them
Magnetism
Vocabulary word-
Something that keeps repeating is known as a _______
Pattern
Forces acting on an object that changes the objects motion
Unbalanced forces
True/False
There is no friction working on objects at rest
False
Friction works on objects that in contact ( touching) at rest or in motion.
The places on a magnet where the magnetic force is the strongest (hint : N and S )
Magnetic Poles
Which objects are never magnetic?
a) leaves
b) jello
c) metal screws
a) leaves
b) jello