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