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### 37 Cards in this Set

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 whats force? a push or pull on something whats force measured in? newtons or kgm/s2 whats the difference between mass and weight? mass stays the same and weight changes depending on the gravitaional pull whats acceleration? rate of change in velocity which occurs when an obect is speeding up, slowing down, or changing direction whats the formula for acceleration? Vf-Vi t whats friction? ** whats static friction? give an example friction between 2 stableized objects * the friction between a table and the floor whats sliding friction? example friction between 2 objects that r moving past eachother * sliding furniture across the floor whats rolling friction? example ** * train on a track whats centripetal force? example force on something thats moving in a circle *water in a bucket whats velocity? the speed and direction of a moving object whats the difference between distance and displacement? distance-total length traveled displacement-length traveld away from origin and direction what is the formula for average speed? s=d t whats instantaneous speed? speed at any given point in time whats a net force? the forces left over when the forces r cancelled out wahts a balanced force? any force with a net force of 0 wahts an unbalanced force? any force with a net froce higher than 0 Whats inertia? the tendency 2 resist any change of movement in an object what has greater inertia? a ping pong or a bowling ball? why? bowling ball because more mass = greater inertia whats the formula 4 Newtons 2nd law? f=ma what is newtons 1st law? an object in motion will stay in motion and an object in rest will stay in rest unless an unbalanced force acts on it - The LAw of Inertia what is newtons 2nd law? an object that has an unbalanced force acting on it will accelerate in the direction of that force what is newtons 3rd law? every action has an equal and opposite reaction what r microwelds? ridges, peaks, and valleys (bumps) on an object that causes friction what 2 elements does a force have? magnitude and direction how can a force arrow picture help u? they show direction and size of the force how can u show a greater sized force? longer line waht do speed and velocity have in common? how do they differ? speed is the distance something moves per unit of time and velocity is speed and direction whats another term 4 negative acceleration? deceleration describe 3 ways a car could accerlate? positive negative and zero whats is force, mass, and acceleration measured in? force-newtons or kgm/s2 mass-kg acceleration-m/s2 what 2 factors does the amount of ffriction depend on? the kind of surfaces and the force pressing the surfaces 2gether is it more difficult 2 start an object or keep it moving? start if a leaf and an acorn r dropped at the same time which reaches the ground 1st and why? the acorn because the leaf creates more air resistence how does wd-40 reduce friction? it creates a smooth surface whats an example of force? staying on the ground-the force of gravity how r force and motion related? motion is caused by force