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motion and stuff

ch 1 and 2

QuestionAnswer
whats a reference point? place or object used for comparison to determine if something is in motion
when is an object in motion? if it changes position relatice to its refernce point
whats the equation for average speed? s=d/t, speed=distance/time
whats acceleration? change in velocity divided by the time it takes for a change to occur
whats speed? the distance traveled divided by the time taken to travel the distance
whats the avg speed? same thing as speed practically use same equation
instantaneous speed is? the speed of an object at one instant of time
whats velocity? the speed of the object and the direction of its motion
whats the mass? amount of matter in an object
whats inertia when an object resists to a change in motion
whats momentum ? the measure of how hard it is to stop the object
what does momentum depend on? mass and velocity
The law of the conservation of the momentum? the total momentum of the objects that collide is the same before and after the collision
whats the equation to find out velocity? avg speed equation
whats the acceleration equation? final speed-initial speed/time or Sp-Si/t
whats the equation of momentum? p=mv or momentum=mass*velocity
whats the equation for force? force=mass*acceleration or F=kg*m/s2=1N
whats velocity? speed and direction
whats acceleration? change in velocity
whats the acceleration of gravity? 9.8m/s2
whats force? a push or pull
whats balanced force? equal in size, opposite in direction
whats the net force? the resulting force after all the forces have been added
What was newtons 1st law of motion? matter in motion tends to stay in motion unless acted on by another force.
whats friction? force that opposes sliding between 2 surfaces that are touching
what does friction depend on? pressure and surface
what are the types of friction? static friction:no motion, sliding friction:sliding hands up & down, rolling:like a car or bike down a hill
whats gravity ? force thats exerted between two objects that pull it together
what does gravity depend on? mass
whats newtons 2nd law of the motion? big things need big pushes little things need little pushes
what is force measured in? newtons ex. 50kg*10m/s=500N
what is distance? the length u travel
whats displacement? the direction and difference in position between your starting and ending points
whats a balanced force/ no motion
whats unbalanced force? motion
what happens for every reaction? theres and equal or opposite reaction
Created by: VaLeRiA!
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