mu

mu is a greek letter that stands for coefficient of friction

balanced and unbalanced

another planet

my planet name is andrew land and it is just like earth but stuff that is 15 pounds and under float and 15 and above has gravity

mass and newtons first law.

a car stopped at a stoplight.
a train driving
a ice skater ice skating

free body diagrams

its when a box on the floor pushed to the right constant velocity.

four forces

Applied force is a push or a pull that is caused by a person or thing.
Tentron force is a pulling force usually in a string or a rope.
Potentiol force is a force atracting two objects.
Normal is a force from a surface.

inertia investigation

• Tightening of seat belts in a car when it stops quickly.
• A ball rolling down a hill will continue to roll unless friction or another force stops it.
• Men in space find it more difficult to stop moving because of a lack of gravity acting against them.

vector and scalor

A vector is a quantity with both magnitude (strength) and direction. Like a force having a strength in pounds and a direction. Or a wind having magnitude (in mph) and direction (Northeast). A scalar has only magnitude. Like the length of a segment or amount of peanuts in a jar. Scalars are just numbers.

estimated distances.

distracted driven 

they were distracted by there cell phone . no.

reaction time homework
reaction time includes both of the decisions and the action.
1.stopping a car
2.stopping a train
3.stopping a boat