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frictional force
When one object exerts a force on another object, the second object the same size force on the first object.
That force is called an Opposing Force.
static friction
There are several forces involved while riding a skateboard. The force of friction (air resistance and contact with ground) acting against the motion and the pushing force from when you push off with your foot acting with motion. There are also several normal reaction forces, the weight of the person on the skateboard and the weight of the skateboard on the ground.
This is a mighty vague question, but I'll give it a shoot. A skateboard has wheels - when these wheels are acted upon by a force (such as you pushing it), they proceed to take the energy from that force and change it into centrifugal and centripetal forces- this causes the wheels on your skateboard to turn. Your skateboard won't roll indefinitely from 1 push because while your skateboard is rolling it is creating friction with the sidewalk you're skateboarding on. Friction is caused when 2 objects rub up against each other - this creates heat and a transfer of kinetic energy. Once all the kinetic energy has been transferred from your skateboard's wheels to the sidewalk, your skateboard come to a stop.
...he exerts against the ground
Both, you exert a force onto the sidewalk, and the sidewalk "pushes back" with an equal, but opposite force.
Wheels, ball bearings, the Egyptians building the pyramids using tree trunks to move the stones. An example of rolling friction would be like a skateboard rolling on a sidewalk. car running up a hill. someone pushing a wheel barol A bowling ball
gravity
Bowling ball rolling down the lane.
The dry sidewalk has more friction compared to the ice on the icy sidewalk
gravity
frictional force
When one object exerts a force on another object, the second object the same size force on the first object.
The dry sidewalk has more friction compared to the ice on the icy sidewalk
Friction