When there is no air resistance, why does the vertical componant of a projectile's velocity change with time where the horizontal componant doesn't?
Question 8
8.
A ball is launched straight up. When is the velocity of the ball 0?
Question 9
9.
a projectile is launched vertically at 100 m/s. If you neglect air resistance, when will the projectile return to the same velocity? What about the same speed?
Question 10
10.
Question 11
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Question 12
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Question 13
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Question 14
14.
Question 15
15.
Question 16
16.
Look at the slope, or steepness of the curve on the graph.
What happens to the curve as time passes?
Question 17
17.
Question 18
18.
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Question 19
19.
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Question 20
20.
What happens to the velocity of the ball in the X direction as it falls?
increases
decreases
stays constant
What happens to the velocity of the ball in the Y direction as it falls?
increases
decreases
stays constant
What is the initial velocity in the Y direction?
-15 m/s
15 m/s
0 m/s
-1.01 ms
1.01 m/s
What is the final velocity in the Y direction? On level students - Use the spreadsheet.
-9.9 m/s
0 m/s
-98 m/s
-15 m/s
9.9 m/s
15 m/s
98 m/s
Which is true about the vertical velocity and horizontal velocity?
Vertical velocity is independent of the horizontal velocity.
The vertical velocity is affected by the horizontal velocity
How long does it take the ball to reach the ground? On level students - use the spreadsheet.
1.01 s
2.02 s
0.33 s
0.67 s
If all these left the table at the last moment, which would be the last to hit the ground?
a ball dropped from rest off a table
a ball rolled off a table at a velocity of 1 m/s east
a ball rolled off a table at a velocity of 10 m/s east
A ball launched off a table at a velocity of 10 m/s east and 45° up.
Consider the following formula
Where F is the force of gravity between two objects
m1 is the mass of one object
m2 is the mass of another object
r is the distance between the two objects
G is a constant.
When the distance between two objects increases, the force of gravity between those objects
increases proportionally
increases significantly faster
decreases proportionally
decreases significantly faster
Consider the following formula
Where F is the force of drag from air resistance
ρ is how thick and viscous the air is
v is the velocity of the object
C_D, the drag coefficient is a number that is specific to the shape and material an object is made of. The
A is the surface area of object falling. Note - the viscosity of the air, the drag coefficient and the surface area of the object do not change. consider what variables of the equation DO change.
As a skydiver falls, her speed increases due to the acceleration due to gravity. What effect does increasing speed have on the force of air resistance
The force of drag increases, total force downwards increases
the force of drag decreases, total force downwards decreases
the force of drag increases, total force downwards decreases
the force of drag decreases, total force downwards increases
When you jump upward, your hang-time is the time your feet are off the ground. Does hang-time depend on
The vertical component of your initial velocity
The horizontal component of your initial velocity
both vertical and horizontal components
How many meters had the ball travelled after 4 seconds?
10 m
20 m
30 m
40 m
50 m
Compare the time periods 0-2 seconds and 2-4 seconds.
Which statement is true?
The ball travelled farther between 0 and 2 seconds
The ball travelled farther between 2 and 4 seconds
The ball travelled the same distance in both time periods
No way to tell from the graph
Which statement best describes the ball's speed as it travells down the ramp?
It is going the same speed the whole time
It is speeding up
It is slowing down
There is no way to tell
The graph below shows the distance a biker travels over time.
Match three sections of the graph above with the description of the biker's motion during that time period.
