What does the slope of a displacement (position) v. time graph tell you?
velocity
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10
What force typically opposes the gravitational force?
normal force (sometimes tension force)
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heart
Other team wins 20 points!
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gift
Win 15 points!
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fairy
Take points!
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25
baam
Lose 20 points!
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15
When an object is dropped what is the initial velocity?
0 m/s
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banana
Go to last place!
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fairy
Take points!
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25
shark
Other team loses 20 points!
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baam
Lose 15 points!
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15
How do you decide which kinematic equation to use?
use the equation that does not include the variable for which you have no information
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banana
Go to last place!
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shark
Other team loses 10 points!
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rocket
Go to first place!
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baam
Lose 25 points!
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15
Describe what is happening to the velocity if an object moves with an acceleration of -5 m/s/s?
the velocity decreases by 5 m/s every second
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20
What must be true about acceleration and velocity if an object is speeding up?
acceleration and velocity must be in the same direction
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eraser
Reset score!
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star
Double points!
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fairy
Take points!
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thief
Give points!
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25
At what time(s) did the object turn around (change direction)?
1s and 7s (whenever the line for the v-t graph crosses the x-axis the object is changing direction)
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15
What do you know about the velocity if the forces on an object are balanced?
velocity is constant
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10
T/F: If an object has a velocity of -3 m/s it must be slowing down.
False; -3 tells us the object is moving in the negative direction (left) we know nothing about whether it is speeding up or slowing down bc we do not know a
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10
Are acceleration and mass of an object directly or inversely related? (hint: F=ma)
inversely
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15
What is Newton's 2nd Law?
F = ma
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25
Is the car in the FBD speeding up or slowing down? How do you know?
speeding up; Fnet =( 275+395)-560 = +110 N; Fnet is to the right and velocity is to the right --> object is speeding up
