作者：jie shin lin 13 年以前
3233
Types of forces
Types of forces
Gravitational force
what does the force of gravity do?
it makes things in the air fall to the ground.
it causes water to flow downwards.
A force that pulls objects towards the Earth.
causes objects to have weight.
Elasic spring force
when we compressed them,they can return to their original shapes.
it in the springs when they stretched,twisted or compressed.
Magnetic force
it caused by the pushing or pulling action of a magnet.
Frictional force
froction can be a problem
friction can be a problem like:wear out,overheat and slow down.
friction can be useful
The soles of shoes and the ground stop you from slipping when you walk.
a force that produce when two surface are rubbes aganist each other.
