Contact and Non-contact Forces Assignment Now that you have learned about forces, complete and submit the following assignment.

For the following situations, describe the contact and non-contact forces that are involved.

Situation
Contact Force(s)
Non-Contact Force(s)
A book sitting on a shelf

A soccer player kicking a ball; the ball soaring through the air and landing on the ground

A hiker in the woods reading her compass to determine which direction to go

A child on a sled; first, the child is sitting at the top of the hill, waiting his turn; then, the child pushes off and slides down the hill, eventually coming to a stop.

I didn't know the subject but I researched and understood so...here goes!!

A book resting on a shelf: contact force- reaction force

                                          non contact force: gravitational force

Soccer ball- contact force- air resistance

                   non contact force- gravitational force

Compass- contact force- reaction force

                non contact force- magnetic force

child on sled- contact force- friction

                      non contact force- gravitational force

Explanation:

the assestment will probley apele with cause and effect

russian is not my first language, so i'm afraid i can't write out an answer in russian, but hopefully you can find a way to do so. here's my best translation of the problem: you're given a plot of a particle's position in one-dimensional space over time, and you're asked to find either the total distance traveled by the particle after 6 seconds had elapsed, or the total displacement of the particle after 6 seconds.

if you want the total distance traveled, you would first need to determine the particle's velocity as a function of time, then integrate that over the 6-second interval. we know the position function is quadratic with roots at 0 and 6, so we have

where is unknown. because the position is parabolic, there is symmetry about the midpoint at , and we know that

so that the position function is

which means the velocity is

then the total distance traveled is

so the total distance traveled is 20 m.

on the other hand, if you want to find displacement: the particle starts at and ends at , so its displacement is 0.