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PHYSICS 11 REVIEW
Physicist:_______________________________
Questions #1 - #3 deal with the following displacement-time graph. Each unit on the time axis represents 1.00
second; each unit on the displacement axis represents 10.0 m.
Displacement (x101 m)
8
6
4
2
0
-2 0
2
4
6
8
10
-4
-6
-8
Time (s)
1. What is the total distance traveled by the object from 5.00 s to 10.0 s? (130 m)
2. What is the velocity of the object at 6.50 s? (-60 m/s)
3. What is the acceleration of the object at 6.50 s? (0 m/s/s)
4. A car accelerates from 30.0 m/s to 20.0 m/s in 6.00 s. How far will it travel in that time? (150 m)
5. A ball is thrown upwards with an initial velocity of 15.0 m/s. What is its maximum height? (11.5 m)
Velocity (x101 m/s)
Questions #6 - #8 deal with the following velocity-time graph. Each unit on the time axis represents 1.00 second;
each unit on the velocity axis represents 10.0 m/s.
4
3
2
1
0
-1 0
-2
-3
-4
-5
-6
2
4
6
8
10
Time (s)
6. What is the objects acceleration at 3.00 s? (-10 m/s/s)
7. What is the objects displacement at 10.0 s? (-180 m…area under curve)
8. What is the total distance traveled between in the 10.0 s time interval? (300 m)
9. How much does a 5.0-kg cat weigh in an elevator traveling upwards at an acceleration of 6.0 m/s2? (79 N) What is its
mass? (5.0 kg)
10. How much does this same cat weigh in an elevator traveling down at a constant velocity of 3.0 m/s? (49 N) What is
its mass? (5.0 kg)
11. What is the coefficient of friction between a 10.0 kg object and the floor if 50.0 N of force is needed for it to be moved
at a constant velocity? (0.509)
12. How much work is done on a 15.0- kg box that is carried up a 6.00- m ladder that is at 70.0o with the floor? (830 J)
13. How much potential energy does the box in question #12 have compared to the floor? (830 J)
14. A boat traveling at 6.00 m/s crosses a stream flowing at 2.00 m/s. If the stream is 50.0 meters across, how far down
stream does the boat land? (16.7 m)
15. Two forces act on an object. One pushes to the north at 10.0 N, and the second pushes to the east at 15.0 N. What
is the resultant vector? (18.02 N, 56.3o E of N)
PHYSICS 11 REVIEW
Physicist:_______________________________
16. A 3.0- kg mass is accelerated from rest at a rate of 3.0 m/s2. After 20.0 meters how much kinetic energy does the
mass have? (180 J)
18. A water wave passes a raft. If the distance between 2 crests is 10.0 meters, and it takes the wave 20.0 seconds to
travel 15.0 meters. What is the frequency of the wave? (0.075 Hz)
19. A dog barks towards a canyon wall. If after 1.5 s the dog hears his own bark, how far away is the canyon wall? (497
m)
20. What is the momentum of a 0.100 g bullet traveling at 350 m/s? (0.035 kg∙m/s)
21. An object is thrown directly upwards with an initial velocity of 25 m/s.
(A) What is the maximum height the object will travel? (32 m)
(B) How long will it take to return to its starting point? (5.15 s)
(C) What will its velocity be when it is 2.0 meters above its starting point as it travels downwards? (24.2 m/s)
22. A woman moving a large 80.0-kg trunk, attaches a rope to one end and pulls with a horizontal force of 120 N, at a
constant velocity across the floor.
(A) What is the force of friction acting on the trunk? (120 N)
(B) What is the coefficient of friction between the trunk and the ground? (0.15)
(C) What would be the acceleration if she pulled with a force of 2.00 x 102 N? (1.0 m/s/s)
23. A boy pushes a lawnmower with a force of 1.00 x 102 N at an angle of 40.0o degrees to the horizontal. If the boy
mows 1.00 x 102 m of grass in 5.00 minutes (A) How much work does he do? (7660 J) (B) What is his power? (25.5 W)
24. A 1.50 kg apple rests on a branch of a tree 20.0 meters above the ground.
(A) What is its potential energy of the apple compared to the ground? (294 J)
(B) If it falls, what is its kinetic energy just before it hits the ground? (294 J)
(C) What is its velocity just before it hits the ground? (19.7 m/s)
(D) What is the velocity of the apple 7.00 meters above the ground? (16.0 m/s)
25. A 90.0 kg fullback running at 5.0 m/s attempts to dive across a goal line. Two linebackers meet him – moving in the
opposite direction. The first has a mass of 70.0 kg and is moving at 2.0 m/s, the second has a mass of 80.0 kg and is
moving at 4.00 m/s. If they all become entangled as one, what is the resultant velocity of the pile? (-0.042 m/s)
26. An incident light ray traveling in air (n=1.00) hits a layer of oil at 35.0o degrees to the normal. If the ray is refracted
20.0o degrees to the normal.
(A) What is the index of refraction for the oil? (1.68)
(B) If the light ray then travels into a layer of water (n=1.33), which is parallel to the oil/water layer, what is the
angle of refraction in the water? (25.5o)
(C) What is the speed of light in the water? (2.26 x 108 m/s)
27. Find the index of refraction of a ruby that has a critical angle of 27.0o (in air)? (2.2)
28. What is the new critical angle of the same ruby if it is now submerged in oil that has an index of refraction of 1.40?
(3.08)
Formula Sheet
Kinematics:
d
v
t
v
a
t
v f  v i  at
Vectors:
Dynamics:
Fnet  m  a
Fw
Ff
Fll
F
1
(v f  v i )t
2
1
d  v i t  at 2
2
 mg
 FN
 Fw sin 
 Fw cos 
d
2
2
v f  v i  2ad
g = -9.81 m/s 2
Momentum:
p  m  v
Ft  p
Work, Energy & Power:
W  F cos   d
E p  mgh
1
mv 2
2
W  Ek
Ek 
P 
ns 
W
t
Efficiency 
Waves:
1
f 
T
v f
ni sin  i  nr sin  r
Woutput
Winput
c
vs
nr
ni
c = 3.00 x 108 m/s
sin  c 
 100 %