Physics 30: Chapter 1 Exam – Review of Physics 20
Name: ______Date: ______Mark: ____/35
Written Response. Show all your work. Clearly identify your final answer(s) rounded off to the proper number of significant digits.
1.Three forces are acting on an object: F1 = 200 N, 40.0° E of N; F2 = 500N, 60.0° S of E; F3= 800 N, 20.0° S of W. Determine the net force acting on the object. (5 marks)
Multiple Choice. Select the best answer and mark it clearly on your Scantron.
1.Select the list that contains only vector quantities.
a. / force, time, displacementb. / speed, time, distance
c. / force, speed, acceleration
d. / acceleration, force, velocity
2.0.020 49 m rounded to two significant digits is
a. / 0.021 mb. / .02 m
c. / 0.02 m
d. / 0.020 m
3.A Ferrari F50 can accelerate from zero to 100 km/h in a time of 3.8 s. The magnitude of its acceleration is
a. / 26 m/s2b. / 7.3 m/s2
c. / 3.8 m/s2
d. / none of the above
4.A ball is travelling at 10.0 m/s to the north when it is hit by a bat and moves at 14.0 m/s to the south. Assuming north is positive and south is negative, the ball’s change in velocity is
a. / +4.0 m/sb. / -4.0 m/s
c. / +24.0 m/s
d. / -24.0 m/s
5.Two masses of equal size and shape are dropped from a height of 10 m at the same time. Mass A has a density twice that of mass B. Ignoring effects due to air resistance, mass A will
a. / contact the ground before mass Bb. / contact the ground at twice the speed of mass B
c. / accelerate at twice the rate of mass B
d. / contact the ground at the same time as mass B
6.The tendency for an object to maintain its motion is called
a. / speedb. / energy
c. / velocity
d. / inertia
7.Sir Isaac Newton is pulling his apple cart across the courtyard at Cambridge by applying a 40N force along the handle which is inclined at 50° relative to the horizontal. Determine the component of the applied force in the direction of the wagon’s motion.
a. / 20 Nb. / 26 N
c. / 30 N
d. / 40 N
8.A 6.0 kg block is released on a 10 m long frictionless surface inclined at 40° relative to the horizontal. Calculate the magnitude of the block’s acceleration down the incline.
a. / 3.2 m/s2b. / 6.3 m/s2
c. / 7.5 m/s2
d. / 9.8 m/s2
9.The fundamental equivalent units of newtons are
a. / kg•m/sb. / kg•m/s2
c. / kg2•m/s
d. / kg2•m/s2
10.A turnip has a weight of 6.0 N on the Earth. If this turnip were transported to the Moon, whose gravitational field is 1.6 m/s2, the turnip would have a weight of
a. / 0.98 Nb. / 1.0 N
c. / 1.6 N
d. / 6.0 N
11.A steel projectile is shot horizontally at 10.0 m/s from the top of a tower. The projectile landed 33.0 m away from the base of the tower. Ignoring effects due to air resistance the height of the tower would be
a. / 16.2 mb. / 53.4 m
c. / 107 m
d. / none of the above
Use the information below to answer questions 12 – 14.
Four free-body diagrams for an elevator are drawn below. Match the appropriate free-body diagram with the description of motion in the questions that follow.
12.An elevator is travelling upwards at constant velocity. The free-body diagram that best describes this motion is
a. / 1b. / 2
c. / 3
d. / 4
13.An elevator is accelerating downwards. The free-body diagram(s) that best describes this motion is
a. / 1b. / 2
c. / 2 and 4
d. / 4
14.An elevator started at the fourth floor of a building and is slowing down as it comes to a stop at the second floor. The free-body diagram that best describes this motion is
a. / 1b. / 2
c. / 3
d. / 4
15.Nastacia walks 100 m to the north and then 200 m to the west. Determine her displacement relative to her starting point.
a. / 300 m 45°, north of westb. / 100 m 45°, west of north
c. / 224 m 26.6°, north of west
d. / 224 m 26.6°, west of north
16.An electron (9.11 x 10-31 kg) is moving at a speed of 1.25 x 107 m/s. Its kinetic energy is
a. / 1.14 x 10-23 Jb. / 7.12 x 10-17 J
c. / 1.42 x 10-16 J
d. / 5.69 x 10-24 J
Use the information below to answer question 17 & 18.
Velocity and force vectors are drawn on a ball in the diagrams below.
17.The diagram(s) that best represents an object that is decreasing speed is
a. / 1b. / 2
c. / 3
4. / 2 and 3
18.The diagram(s) that best represents an object that is moving in a circular path is
a. / 1b. / 2
c. / 3
d. / 2 and 3
19.A rubber stopper is tied to a 1.0 m long string and is whirled around in a horizontal circle at a constant speed. Determine the stopper’s speed if it completes 10 cycles in a time of 8.1 s.
a. / 0.39 m/sb. / 3.9 m/s
c. / 0.78 m/s
d. / 7.8 m/s
20.A 40 g mass is swung in a circle on the end of an 80 cm long string at a speed of 5.9 m/s. Calculate the magnitude of the centripetal force acting on the mass.
a. / 0.30 Nb. / 1.7 N
c. / 7.0 N
d. / 17 N
21.A tourist shouts across a canyon. The sound wave he creates travels at 342 m/s across the canyon and reflects off the opposite rock wall. He hears the echo 0.950 s after he shouts. Calculate the width of the canyon.
a. / 0.325 kmb. / 0.162 km
c. / 360 m
d. / 180 m
22.A tuning fork is struck and produces a wavelength of 1.56 m. Determine the frequency of the sound wave produced if the speed of sound is 341 m/s.
a. / 219 Hzb. / 532 Hz
c. / 341 Hz
d. / 4.57 x 10-3 Hz
Use the graph to answer question 23.
23.The slope of the graph is
a. / 2.2 m/sb. / 2.2 km/s
c. / 1.4 m/s
d. / 1.4 km/s
24.Identify the graph that shows a properly drawn best-fit line.
Use the information below to answer questions 25 & 26.
The kinetic energy of a mass is given by the expression.
25.Identify the graph below that best communicates the relationship between kinetic energy (Ek) as a function of velocity (v).
26.To obtain a straight line, the variables that must be graphed are Ek as a function of
a. / the inverse of vb. / the inverse of v2
c. / the square root of v
d. / v2
27.For the equation, , the x is the manipulated variable and y is the responding variable. When y is plotted as a function of x, the identity of the slope is
a. / a/2b. / 2a
c. / a
d. / 2x/2
28.A golf ball is dropped from a height of 10 m and requires 1.43 s to hit the ground. Determine its speed when it is half the distance to the ground.
a. / 7.0 m/sb. / 9.9 m/s @
c. / 14 m/s
d. / 98 m/s
29.Determine the acceleration of a mass sliding down a 25° frictionless incline.
a. / 4.1 m/s2b. / 8.9 m/s2
c. / 9.8 m/s2
d. / Cannot be calculated without knowing the value of the mass
Use the information below to answer question 30.
A roller coaster car starts from rest at point J and follows the path shown in the profile of the frictionless track below. The coaster has 15.0 MJ of kinetic energy, relative to the ground, at point K.
30.The kinetic energy at point L is
a. / 5.0 MJb. / 10.0 MJ
c. / 15.0 MJ
d. / 20.0
© Kennedy, 20081Physics 30