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73 Cards in this Set
- Front
- Back
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force
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any action that can change the state of motion of an object or a push or a pull
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gravity electromagnetic strong nuclear and weak nuclear
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4 fundamental forces
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direction
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all forces must have a particular blank
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acceleration
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forces cause changes in motion speeding up slowing down and changes in direction tha tmeans forces cause blank
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newtons
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forces are measured in blank
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kg m/s2
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newton
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force diagram
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more thatn one force can acto on an object at one time to show all the forces acting on an object we draw a blank
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net force
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when more than one force acts on an object the forces combing to form a blank
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total
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net force-the blank force acting on an object
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added
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forces in the same direction get blank together
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subtracted
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forces in opposite directions get blank
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zero
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in order for an object to accelerate there must be a net force greater than or less than blank
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balanced forces
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when two or more forces acting on an object cancel out they are called blank
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accelerate
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balanced forces do not cause blank or changes in motion
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can
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balanced forces blank be in motion
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change
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in a balanced force the motion is not going to blank
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unbalanced forces
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one or more forces on an object that do not cancel out are called blank
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not 0
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with an unbalanced force the net force is blank
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friction
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is a force that opposes motion between two surfaces that are touching
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opposite
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friction acts in a direction that is blank of the motion
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increase roughness of surface or increase the force qushing the two surfaces
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two ways to increase friction
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static friction
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friction between objects that are stationary
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kinetic friction
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friction between moving surfaces
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sliding friction
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when two solid surfaces slide over one another the kind fo friction that occurs is blank
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rolling friction
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occurs when an object rolls over a surface
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rolling sliding
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blank friction is usually less than blank friciton
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fluid frictions
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occurs when an object moves through a liquid or a gas
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air resistance
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is a type of fluid friction involving air
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slowing down
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when fiction is greater than the other forces the object accelerates by blank
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1st
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an object at rest remains at rest and an object in motion maintains its velocity unless acted on by an unbalanced force
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inertia
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the tendency of an object to resist a change in motion
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speeding up
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when friction is less than the other forces the object accelerates by blank
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1st
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we call the blank law the law of inertia
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better
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an object with more inertia is blank at following the 1st law and needs greater forces to change their motion
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mass
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we measure the amount of inertia by the amount of blank an object has
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velocity
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what is the major difference between inertia and momentum
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greater
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if mass is constant the greataer the force the blank the acceleration
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force and acceleration
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what is directly related by 2nd law
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smaller
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if force is constatnt the greater the mass the blank the acceleration
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mass and acceleration
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what is indirectly related by 2nd law
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m/s2
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what is the acceleration unit
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kg
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what is the mass unit
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2nd law
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f=ma
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3rd law
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for everry action force there is an equal and opposite reaction force
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they act ond iffferent objects
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why dont action reaction forces cancel out
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first
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a car slips on an oil slick
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seond
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a grocery cart gets heavier and harder to push as you shop
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first
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a dime falls from the sears tower
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first
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an 18 wheeler applies the brakes suddenly and the cargo shifts forward
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third
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you jump off a diving board and it bounces up and down
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third
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a rocket ship takes off
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first
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using a seat belt to stop you from flying through the window
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second
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pushing a boulder and it is harder to move than a small rock
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third
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rowing a canoe left to move right
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second
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hitting a basevall further than a softball
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third
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a bouncy ball
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first
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whn a car turns right you lean left
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gravity
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a force of attraction between two objects due to their mass
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mass and direction
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the strength of the gravitational force depends on the blank and blank of the two objects
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greater
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the blank the mass the greater the gravity
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smaller
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the blank the distance the greater the gravity
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distance
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blank has more of an affect on gravity
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free fall
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when the only force acting on you is greavity you are in blank
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acceleration
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during free fall all objects fall with the same blank
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acceleration due to gravity
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g
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9.8m/s2
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value of g
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weight in newtons
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a measure of ht egravitational force on an object
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mass
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measures how much matter an object contains and can only change if you gain or lose matter
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gravitationla force
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weight measures the blank and changes as the strenght of gravity cahnges
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increases
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as gravity increases weight blank
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w=mg
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formula for weight
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terminal velocity
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when air resistance matches the force of greavity and yoou no longer accelerate you are at blank
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unbalanced
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what types of force cause acceleration
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