Physics Review - answers Accelerated motion, free-fall, and the Law of Inertia.
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Transcript of Physics Review - answers Accelerated motion, free-fall, and the Law of Inertia.
![Page 1: Physics Review - answers Accelerated motion, free-fall, and the Law of Inertia.](https://reader031.fdocuments.us/reader031/viewer/2022032307/56649cac5503460f9496eb4e/html5/thumbnails/1.jpg)
Physics Review - answers
Accelerated motion, free-fall, and Accelerated motion, free-fall, and the Law of Inertiathe Law of Inertia
![Page 2: Physics Review - answers Accelerated motion, free-fall, and the Law of Inertia.](https://reader031.fdocuments.us/reader031/viewer/2022032307/56649cac5503460f9496eb4e/html5/thumbnails/2.jpg)
What does the slope of a line on a position vs. time graph
mean?
velocity
![Page 3: Physics Review - answers Accelerated motion, free-fall, and the Law of Inertia.](https://reader031.fdocuments.us/reader031/viewer/2022032307/56649cac5503460f9496eb4e/html5/thumbnails/3.jpg)
What does the slope of a line on a velocity vs. time graph
mean?
acceleration
![Page 4: Physics Review - answers Accelerated motion, free-fall, and the Law of Inertia.](https://reader031.fdocuments.us/reader031/viewer/2022032307/56649cac5503460f9496eb4e/html5/thumbnails/4.jpg)
What does the area under the line on a velocity vs. time
graph mean?
displacement
![Page 5: Physics Review - answers Accelerated motion, free-fall, and the Law of Inertia.](https://reader031.fdocuments.us/reader031/viewer/2022032307/56649cac5503460f9496eb4e/html5/thumbnails/5.jpg)
In the first unit of time the bb falls 1 cm as shown.
What is the position of the bb after 3 units
of time?
9 cm
![Page 6: Physics Review - answers Accelerated motion, free-fall, and the Law of Inertia.](https://reader031.fdocuments.us/reader031/viewer/2022032307/56649cac5503460f9496eb4e/html5/thumbnails/6.jpg)
A ball is dropped from rest as shown in the figure. What is the
speedometer reading at 3 seconds?
30 m/s
![Page 7: Physics Review - answers Accelerated motion, free-fall, and the Law of Inertia.](https://reader031.fdocuments.us/reader031/viewer/2022032307/56649cac5503460f9496eb4e/html5/thumbnails/7.jpg)
Joe’s reaction time was 0.12 seconds. He is driving at 20 m/s and sees an obstacle in
the road. How far will he move before he can apply the
brakes?2.4 m
![Page 8: Physics Review - answers Accelerated motion, free-fall, and the Law of Inertia.](https://reader031.fdocuments.us/reader031/viewer/2022032307/56649cac5503460f9496eb4e/html5/thumbnails/8.jpg)
What happens to an unbuckled Kermie when his cart hits a wall?
He continues to move forward and hits the wall
![Page 9: Physics Review - answers Accelerated motion, free-fall, and the Law of Inertia.](https://reader031.fdocuments.us/reader031/viewer/2022032307/56649cac5503460f9496eb4e/html5/thumbnails/9.jpg)
An object is thrown straight upward with a velocity of +50 m/s. At what time will it reach
its highest point?
t = 5 s
![Page 10: Physics Review - answers Accelerated motion, free-fall, and the Law of Inertia.](https://reader031.fdocuments.us/reader031/viewer/2022032307/56649cac5503460f9496eb4e/html5/thumbnails/10.jpg)
An object is thrown straight upward with a velocity of +20 m/s. What is its velocity at its
highest point?
0
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Carts were released from rest along two different inclines.
Which car was on the steeper incline?
Cart A
Cart Bposition
time
Cart A
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Carts were released from rest along two different inclines.
Which cart was on the shallower incline?
velocity
time
Cart C
Cart D
Cart D
![Page 13: Physics Review - answers Accelerated motion, free-fall, and the Law of Inertia.](https://reader031.fdocuments.us/reader031/viewer/2022032307/56649cac5503460f9496eb4e/html5/thumbnails/13.jpg)
Describe the motion of this car
Time (s)
Position
(m)
y = 20x + 0
Moving at a constant velocity of 20 m/s
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A ball is dropped from rest as shown in the
diagram. What is the speedometer
reading at 5 seconds?
50 m/s
![Page 15: Physics Review - answers Accelerated motion, free-fall, and the Law of Inertia.](https://reader031.fdocuments.us/reader031/viewer/2022032307/56649cac5503460f9496eb4e/html5/thumbnails/15.jpg)
Which color car is moving faster?
X(m)
Time (s)
red
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What is happening at the point where the two lines cross?
X(m)
Time (s)
Same place at same time
![Page 17: Physics Review - answers Accelerated motion, free-fall, and the Law of Inertia.](https://reader031.fdocuments.us/reader031/viewer/2022032307/56649cac5503460f9496eb4e/html5/thumbnails/17.jpg)
Describe the motion of these two cars
X(m)
Time (s)
Blue – constant speed
Red - accelerating
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Do these two cars ever have the same velocity?
v(m/s)
Time (s)
yes
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A plane traveling toward the left wants to drop a package on the X.
At what point must the plane drop the package?
C
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Describe the a-t graph that matches this motion
v(m/s)
Time (s)
0
Flat line above 0
![Page 21: Physics Review - answers Accelerated motion, free-fall, and the Law of Inertia.](https://reader031.fdocuments.us/reader031/viewer/2022032307/56649cac5503460f9496eb4e/html5/thumbnails/21.jpg)
Describe the a-t graph that matches this motion
v(m/s)
Time (s)
0
Flat line below 0
![Page 22: Physics Review - answers Accelerated motion, free-fall, and the Law of Inertia.](https://reader031.fdocuments.us/reader031/viewer/2022032307/56649cac5503460f9496eb4e/html5/thumbnails/22.jpg)
An object is thrown straight upward with a velocity of +50 m/s. What is its acceleration
at the highest point?
-10 m/s2
![Page 23: Physics Review - answers Accelerated motion, free-fall, and the Law of Inertia.](https://reader031.fdocuments.us/reader031/viewer/2022032307/56649cac5503460f9496eb4e/html5/thumbnails/23.jpg)
A marble and a bowling ball are dropped from a tower. Ignoring air resistance,
which strikes the ground first?
Both strike same time
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Describe the motion of this object
t = 0
X = 0X = 1 m X = 4 m X = 9 m
acceleration
![Page 25: Physics Review - answers Accelerated motion, free-fall, and the Law of Inertia.](https://reader031.fdocuments.us/reader031/viewer/2022032307/56649cac5503460f9496eb4e/html5/thumbnails/25.jpg)
What is the displacement of this object for the first 3 s?
15 m
![Page 26: Physics Review - answers Accelerated motion, free-fall, and the Law of Inertia.](https://reader031.fdocuments.us/reader031/viewer/2022032307/56649cac5503460f9496eb4e/html5/thumbnails/26.jpg)
What is the average velocity for the first 3 s?
5 m/s
![Page 27: Physics Review - answers Accelerated motion, free-fall, and the Law of Inertia.](https://reader031.fdocuments.us/reader031/viewer/2022032307/56649cac5503460f9496eb4e/html5/thumbnails/27.jpg)
Determine the displacement for the first 3 s.
9 m
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Determine the instantaneous velocity at t = 2 s.
2 m/s
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What is the acceleration of this object?
- 2 m/s2
![Page 30: Physics Review - answers Accelerated motion, free-fall, and the Law of Inertia.](https://reader031.fdocuments.us/reader031/viewer/2022032307/56649cac5503460f9496eb4e/html5/thumbnails/30.jpg)
A rock is dropped from a bridge and it takes 3 seconds to hit the water. How high is the bridge above the water?
Ignore air resistance.
45 m
![Page 31: Physics Review - answers Accelerated motion, free-fall, and the Law of Inertia.](https://reader031.fdocuments.us/reader031/viewer/2022032307/56649cac5503460f9496eb4e/html5/thumbnails/31.jpg)
Describe the motion of this object
t = 0
X = 0X = 1 m X = 4 m X = 9 m
Constant speed
![Page 32: Physics Review - answers Accelerated motion, free-fall, and the Law of Inertia.](https://reader031.fdocuments.us/reader031/viewer/2022032307/56649cac5503460f9496eb4e/html5/thumbnails/32.jpg)
What is the object’s velocity at t = 7 s?
0
30
60
0 1 2 3 4 5 6 7 8 9 10
11
12
13
14
15
16
17
18
19
20
Time (sec)
Velocity (m/s)
30 m/s
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What is the object’s acceleration at t = 18 s?
0
30
60
0 1 2 3 4 5 6 7 8 9 10
11
12
13
14
15
16
17
18
19
20
Time (sec)
Velocity (m/s)
12.5 m/s2
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What is the object’s displacement between t = 5 and t = 9 s?
0
30
60
0 1 2 3 4 5 6 7 8 9 10
11
12
13
14
15
16
17
18
19
20
Time (sec)
Velocity (m/s)
120 m
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Where is the object at t = 20 s?
0
30
60
0 1 2 3 4 5 6 7 8 9 10
11
12
13
14
15
16
17
18
19
20
Time (sec)
position (m)
10 m
![Page 36: Physics Review - answers Accelerated motion, free-fall, and the Law of Inertia.](https://reader031.fdocuments.us/reader031/viewer/2022032307/56649cac5503460f9496eb4e/html5/thumbnails/36.jpg)
An object is thrown straight upward with a velocity of +40 m/s. At what time will it reach
its highest point?
4 s
![Page 37: Physics Review - answers Accelerated motion, free-fall, and the Law of Inertia.](https://reader031.fdocuments.us/reader031/viewer/2022032307/56649cac5503460f9496eb4e/html5/thumbnails/37.jpg)
What is the difference between speed and
velocity?
Speed is how fast; velocity is speed and direction
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Example of an accelerating object that
has constant speed
Object moving in a circular path
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What is the velocity of an object 7 seconds after being thrown upward with an initial velocity of +50 m/s upward?
-20 m/s
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Who was the person who first published a book that
suggested the Earth moves around the Sun?
Copernicus
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What is the usual reason that an object sliding along a flat
surface stops?
friction
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An object in motion will continue moving at a constant
speed in a straight line UNLESS ________
An unbalanced force acts
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A ball is whirled around in a circle on a string. The string breaks when the ball is at the point shown below. Which letter best describes the
path of the ball after the string breaks?
b