2018 Mod10 Flashcards
Write out the definitions for the following:
A. Inertia
The tendency have an object to resist changes in its velocity
B. Friction
A force that opposes Motion, resulting from the contact two surfaces
C. Kinetic Friction
Friction that opposes motion once the motion has already started
Static friction
Friction that opposes the initiation of motion
State newtons first law of motion
In object in motion or at rest, will tend to stay in motion or at rest until it is acted upon by an outside force
State newtons second law of motion
When an object is acted upon buy one or more outside forces, total force is equal to the mass of the object times the resulting acceleration
State newtons third law of motion
For every action there is an equal and opposite reaction
In space there is Amos no air so there is virtually no friction is an astronaut then throws the ball in space was in in tolls that velocity of 3.0 m/s to the west what will be the boss was his day in the year assume there are no nearby.
0.3 m/s squared West
Hey boys running north with a bean bag in his hand he passes the tree and at the same moment he drops it being back as he passes the tree with the beanbag land next to the tree it’s not will be north or south of the tree
North
Supposed to situation in question for is now changed the boys running but now his friends dancer side the tree with the beanbag as a boy houses he barely talks to being back causing it to fall out of his friends hand with a beanbag man next to the tree if not it will be north or south of
It’ll be next to the tree
You’re busy shoppers driving down the road many boxes like piled in the backseat of a car evidence of shopping activity. Suddenly the shop or my system breaks to avoid a collision with the boxes that farther back in the seat or the same in the front seat with the right driver can feel it
That they will slam into the front seat
When Road to get wet, they become slick. Obviously then the friction between the cars tires in the road decreases when the road is why?
The water feels in the groove making the roads moose and has less from question traction for the driver so wheels
And the other side if in order to sly different refrigerator across the floor, etc. and of course once it is move-in doing however the man needs not exert nearly much for us to keep it moving why?
Because he has overcome static friction and is now dealing with the lesser kinetic friction
A child is pushing her toy across the room with the constant velocity to the east if the static friction between the toy in the floor is 15 Newtons and the units for the kinetic friction is 10 newtons and what if horses a child exerting?
10 N newtons
A father is trying to teach his child to ice skate as a child since till his father pushes him forward with the acceleration of true. 2 m/s North if the child is mass is 20 kg what is the force with which the father is pushing and Siri are on ice you can assume that there is not no friction
Total force equals 20 kg times 2.0 m/s squared equals 40 newtons
