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