Contact Forces
Friction
Non-contact forces
Magnets
Static Electricity
100
Contact force is when forces act directly on objects or when it doesn't need to contact an object to move or change it ?
It's when forces act directly on objects to move or change it.
100
What's friction?
It is a force that happens when two objects rub together.
100
Non-Contact force is when forces act directly on objects or when it doesn't need to contact an object to move or change it ?
It's when it doesn't need to contact an object to move or change it.
100
When the same pole from two magnets are placed near one another, they will _______ (repel or attract?).
repel
100
Scientists understand that everything in the universe is made up of tiny particles. How do we call these particles?
Atoms
200
How do we call a FORCE that moves something towards you? PUSH or PULL?
PULL
200
Smooth surfaces produce _________(less/more) friction.
Smooth surfaces produce LESS friction.
200
Gravity pulling you toward Earth is an example of contact or non-contact force?
non-contact force
200
When opposite poles from two magnets are placed near one another, they will _______ (repel or attract?).
attract
200
Static electrivity is when there is the same amount of protons and electrons or when there are some extra particles?
extra particles (after rubbing)
300
How do we call a FORCE that moves something away from you? PUSH or PULL?
PUSH
300
Rough surfaces produce _____(less/more) friction.
Rough surfaces produce MORE friction.
300
Tell me one example of non-contact force.
Magnetic Force, Electrostatic Force or Gravitational Force.
300
Are plastic and wood magnetic materials?
No
300
The girl's hair and the balloon are attracting one another. The hair and the balloon have: (opposite or same charges?)
opposite charges
400
Pushing a grocery cart is an example of contact or non-contact force?
contact force
400
The taxi driver has to be more careful when driving in winter because the road is more slippery than when he drives in summer. That means the friction on the road during winter is _______the friction during summer:
a) more than
b) less than
c) the same as
That means the friction on the road during winter is LESS THAN the friction during summer.
400
Static Electricity pulling up your hair is an example of contact or non-contact force?
non-contact force
400
Magnetism is a force that pulls metals toward a magnet or push metals away from magnet?
a force that pulls metals toward a magnet
400
In picture A, this balloon has not been rubbed with the cloth. What kind of charge does the balloon have? (positive, negative or neutral?)
neutral
500
A paper clip sticking to a magnet is an example of contact or non-contact force?
non-contact force
500
In which picture there is less friction? Explain.
Picture A because smooth surfaces produce less friction while rough surfaces produce more friction.
500
Pedaling a bicycle is an example of contact or non-contact force?
contact force
500
List three objects that are magnetic (can be attracted by a magnet).
paper clip, scissors, nail, hand saw ...
500
In picture B, this balloon has been rubbed with the cloth. What kind of charge does the cloth have? *** What kind of charge does the cloth have? (positive, negative or neutral?)
positive