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77 Cards in this Set
- Front
- Back
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motion
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an object is in blank when its distance from another object is changing
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reference point
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an object used for comparison to determine if an object is in motion
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distance
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an object is in motion if it changes its blank from a reference point
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stationary
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when we choose a reference point we assume it is blank
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reference point
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whenever you describe motion you describe it in terms of your blank
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relative
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motion is blank because it depends on your reference point
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inside of car
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if you are in a car you feel like you are not moding what are you using as a reference point
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speed
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the distance the object travels in one unit of time
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distance and time
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what do you need in order to find the speed of an object
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d/t
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formula for speed
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constant speed
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if an object moves equal distance for every unit of time they have blank
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average
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most speed is blank because there are slight changes in speed over a period of time
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t=d/s
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formula for speed
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d=ts
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formula for distance
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velocity
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speed in a given direction
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speed direction
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in order to change velocity you can change waht two things
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v=d/t
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formula for velocity
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velocity
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on a distance vs time graph what does the slope tell you
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going backwards
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on a d vs t graph what does a negative slope tell you
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higher
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the faster the rate of speed the blank the slope
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lower
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the slower the rate of speed the blank the slope
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levels off
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what happens to your graqh when you are not moving
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constant motion
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a straight line shows blank
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changing motion
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a line that isn't straight means blank
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acceleration
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the rate at which velocity changes
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increase speed decrease speed or change direction
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3 ways to change acceleration
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vf-vi/t
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formula for acceleration
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vf-vi/a
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formula for time wiht acceleration
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vi+at
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formula for vf
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vf-at
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formula for vi
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constant acceleration
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occurs when the object increases speed at the same rate
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average acceleration
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occurs when the acceleration over a time period changes
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acceleration
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on the v vs t graph what does the slope tell you
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no acceleration
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a flat line on a v vs time graph means what
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velocity, distance
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on a d v t graph a straight line means constant blank but changing blank
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acceleration, velocity
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in v v t graph a straight line means constant blank but changing blank
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momentum
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the quantinty of motion that an object has masss in motion
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mv
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formula for momentum
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conserved
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one important thing to know about momentum is that it is always blank
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distance
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45ft
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t
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45 hr
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v
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45 mi/hr North
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s
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45ft/hr
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a
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45 ft/hr2
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m
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15kg x m/s
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motion
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speed is a way to measure blank
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select moving object as a reference pt or use something in outerspace
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explain how you can be moving even when you are sitting still
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velocity
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the slope of a distance v time graph is vlank
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acceleration
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the slope of a velocity v time graph is blank
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32,2
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your friend is walking 2mi/hr toward the front of the bus which is traveling 30mi/hr. you are looking on from outside the bus. How fast is he traveling? To a person in the bus, how fast is he traveling?
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going 4mi/hr fater every second
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what does 4 mi/hr/s mean
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no
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can a car have constant velocity and still be accelerating?
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yes changing direction
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can a car have constant speed and still be accelerating
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increase/decrease speed or change direction
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what are three ways you can accelerate or change velocity
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has a direction
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how is velocity different from speed
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the runner is accelerating because he is changing direction
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a runner it traveling around a track at a constant speed of 9mi/hr. Explain how the runner is accelerating even if the speed remains constant
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3m/s don't know velocity because there's no direction
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a car travels 45m in 15s what is the speed? do you know velocity
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120m
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a runner has constant velocity of 4m/s north. if he runs for 30s how far will he have traveled
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average speed 2.7m/s
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joe walks 30m in10s and then another 10m in 5s. what is his average speed for the entire trip
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900s
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kylie holmer enjoys walking with her mom at 3ft/s. in order for her to fall asleep mrs holmer must walk her for 2700ft how long does it take kylie to fall asleep
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1cm/min2
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a snail is traveling at a pace of .25cm/min it sees that iti si going to be eaten by a fish so it increases its speed to .3cm/min to avoid being eaten if it takes .05min to make the change what is the snails acceleration
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-2mi/hr/s
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a car goes from 60mi/hr to 40 mi/hr in 10s what is the drivers acceleration
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150m/s forward
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a car has an initial velocity of 0m/s if the car acceleraties at a rate of 15m/s2 for 10s what is the final velocity
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10m/s forward
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a car has a final velocity of 20m/s with an acceleration of 5m/s2 if it took 2s to accelerate what was the initial velocity
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48kg m/s toward wall
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a 12kg ball is rolling toward the wall at 4m/s what is its momentum
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velocity momentum sometimes acceleration
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which measurements should include a direction
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velocity relates to energy that cas to be conserved
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why is momentum conserved
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momentum will be the same
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a 5kg ball is rolling at 10m/s formared toward a 2kg ball at rest after they collide what will happen to momentum
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bcd
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which graphs represent constant non zero velocity
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e
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which graph represents constant non 0 acceleration
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a
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which graph represents 0 velocity
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abcd
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which graph represents 0 acceleration
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ef
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in which graphs does the velocity change
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f
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in which graph does the acceleration change
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c
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which graph b or c represents the slowest non 0 velocity
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abcdef
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which graphs give information about acceleration
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position
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when an object changes blank with respect to a frame of reference, teh object is in motion
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