Forces
Friction
Gravity
Magnets
Mixed Bag
Vocabulary
100
A force is ...
a push or a pull
100
Friction can _____ or _______ _____ an object.
Friction can stop or slow down an object.
100
Gravity is ...
a force that acts on all objects with mass
100
Magnets ______ certain objects
Magnets attract/pull certain objects
100
Objects with a larger ____ have a stronger gravitational pull.
mass
100
a push or a pull
force
200
Net force is the _________ amount of force acting on an object
Net force is the total amount of force acting on an object
200
Friction can only happen when...
Friction can only happen when 2 objects are touching.
200
Does gravity pull objects toward or away from each other?
Gravity pulls objects towards each other.
200
Can a magnet move something without touching it?
Yes, a magnet can move something without touching it.
200
How does gravity affect the relationship between the Sun, the moon and the Earth?
Gravity keeps the Earth in orbit around the Sun, and the Moon in orbit around the Earth
200
the force of a magnet
magnetic force
300
Objects with more ________ require more force to move
Objects with more mass require more force to move
300
Which has more friction - a gravel path or a tile floor?
Gravel path
300
Give a real life example of gravity.
- holding us to the ground
- a ball falling back to Earth after being tossed up
- Earth orbiting the sun
300
What 3 materials have magnetic force?
Iron, nickel, cobalt
*Steel often has a magnetic force because it has iron in it
300
True or False - mass and weight are the same thing
false
300
a force that acts on all objects with mass, pulls objects towards eachother
gravity
400
A force can make an object ...
move, stop moving, speed up or slow down
400
Give an example of a surface with low friction
ice, wet surfaces, polished wood
400
Explain the difference between mass and weight
Mass: the amount of material inside an object
Weight: the amount of force of gravity acting on an object
400
What is the magnetic field?
The area affected by a magnetic force
400
Why might a paper clip not stick to a magnet?
The magnet may be out of the magnetic field
400
a force that acts against an object’s motion when two or more objects touch
friction
500
The _______ team would win this game because ___________________.
The blue team would win this game because they have more mass, and more net force.
500
How can friction be lowered?
Adding oil or grease
500
Why would you weigh less on the moon than on Earth?
The moon has less mass than Earth, so its gravitational pull is weaker.
500
What part of a magnet has the strongest magnetic force?
The poles of a magnet have the strongest magnetic force
500
When might friction be helpful?
It helps us grip things more tightly, keeps us from slipping all over
500
the amount of material in an object
mass