Download Physics Review Questions for Final

Physics Review Questions for Final (Concepts)
1) When you look at the speedometer in a moving car, you can see the car’s
a) instantaneous speed b) average speed c) instantaneous acceleration d) average
acceleration.
2) Suppose you are in a car that is going around a curve. The speedometer reads a constant 30
mph. Which of the following is NOT true?
a) You and the car are accelerating b) Your speed is constant c) Your velocity is constant
d) Your acceleration is directed toward the center of the curve.
3) A ball is thrown straight up. At the top of its path the magnitude of its acceleration is
about a) 0 b) 5 c) 10 d) 20 m/s2.
4) Suppose an object is in free fall. Each second the object falls a) with the same average
speed b) with the same instantaneous speed c) the same distance as in the second before
d) a greater distance than in the second before.
5) If you drop a feather and a coin at the same time in a tube filled with air, which will reach
the bottom of the tube first? a) the coin b) the feather c) neither, both will hit at the same
time.
6) Repeat question for a vacuum tube.
7) Friction a) acts in a direction opposite to the direction of motion of an object b) comes
from microscopic bumps that act as obstructions to an object’s motion c) is the name given to
the force acting between surfaces sliding past one another d) all of the above.
8) A ball rolling down one inclined plane would roll how far up another inclined plane? a) to
nearly twice the original height b) to nearly the original height c) to nearly half the original
height d) it depends on the angle of the incline.
9) How much inertia would a 2 kg mass of feathers have compared to a 1 kg mass of iron?
a) four times b) twice c) the same d) one-half as much
10) If the force acting on a cart is doubled, what happens to the cart’s acceleration?
a) quadrupled b) doubled c) halved d) quartered.
__________
11) A girl whose weight is 200 N hangs from a bar supported by two strands of rope. What is
the tension in each strand? a) 400 b) 300 c) 200 d) 100 N
12) A tennis ball and a solid steel ball the same size are dropped at the same time. Which ball
has the greater force acting on it? a) tennis b) steel c) they both have the same force acting
on them.
13) Same situation but which has the greater acceleration?
14) I goofed in the numbering. This is not a question.
15) When a football is kicked, the action and reaction forces do not cancel each other because
a) they are not equal and opposite b) they are equal and opposite, but not at the same time
c) they act on different objects (the kicker’s foot and the ball) d) the kicker’s force on the ball
is larger than the ball’s force on the kicker.
16) The weight of a person can be represented by a vector that acts a) perpendicular to the
ground underneath the person b) parallel to the ground c) straight down d) in a direction that
depends on where the person is standing.
17) Which of the following would NOT be considered a projectile? A cannonball
a) thrown through the air b) rolling down a slope c) thrown straight up d) rolling off the
edge of a table
18) A ball is thrown into the air at some angle between 0 and 90 degrees. At the very top of the
ball’s path, its velocity is a) entirely vertical b) entirely horizontal c) both vertical and
horizontal d) there is not enough information given to determine.
19) In the absence of air resistance, a thrown ball will have the greatest range if it is thrown at
an angle of a) 30 b) 45 c) 60 d) 90 degrees.
20) At what point in its path does a projectile have its minimum speed? a) when it is thrown
b) half-way to the top c) at the top d) as it nears the ground
__________
21) If the momentum of an object changes and its mass remains constant, what else is
happening to the object? a) its velocity is changing b) it is accelerating (or decelerating)
c) there is a force acting on it d) all of the above
22) The momentum change of an object is equal to the a) force acting on the object
b) velocity change of the object d) impulse acting on the object d) mass of the object times
the force acting on it
23) A ping-pong gun, initially at rest, fires a ball. After the shot, the sum of the gun’s and
ball’s a) velocities b) accelerations c) masses d) momenta
is zero.
24) Two gliders having the same mass and speed move toward each other on an air track and
stick together. After the collision, the velocity of the gliders is a) twice the original b) the
same as the original c) one-half the original d) zero.
25) As a pendulum swings back and forth a) PE is transformed into KE b) its energy is all
kinetic at the lowest part of its swing c) its energy is all potential at the end points of its swing
d) all of the above
26) Which of the following is NOT an example of a simple machine? a) fulcrum b) lever
c) inclined plane d) pulley
27) An object will fall over if a) its CG is too high b) its CG is too low c) its CG is not over
its area of support d) there is a large sideways force on the object, below its CG
28) Newton reasoned that the gravitational attraction between the earth and the moon must be
a) directly proportional to the square of he distance between them b) inversely proportional to
the square of the distance between them c) the same at all distances d) independent of
distance
29) Gravitational forces are the weakest forces found in nature. Because of this,
a) gravitational effects can only be observed when a large mass is involved. b) the gravitational
effect between a pencil and the earth cannot be seen c) there is no gravitational force between
two 1 kg masses d) there is no movement between two 1 k masses located near each other in
space
30) The gravitational force between two masses a) is always an attraction b) depends on how
large the masses are c) depends inversely on the square of the distances between the masses
d) all of the above
__________
31) Suppose the gravitational force between two masses is 10 N. If the distance between the
masses were cut in half, what would the force between them be? a) 40 b) 20 c) 5 d) 2.5 N
32) Same question, but distance is doubled.
33) Same question, but each mass is doubled (distance as original).
34) The value of the acceleration due to gravity a) depends on the radius of the earth
b) depends on the mass of the earth c) is different on different planets d) all of the above
35) If the earth had twice its present mass, but the same radius, what would the value of g be?
a) 39.2 b) 19.6 c) 9.8 d) 4.9 m/s2
36) If the radius of the earth were one half what it is now, and its mass were the same, what
would the value of g be? a) 39.2 b) 19.6 c) 9.8 d) 4.9 m/s2
37) The gravitational field strength at the center of the earth is a) great b) the same as on the
surface c) smaller than on the surface, but still greater than zero d) zero
38) If you were to weigh yourself in an elevator that was accelerating upward, your weight,
compared to your ordinary weight, would be a) greater b) the same c) less, but greater than
zero d) zero
39) If you were to weigh yourself in an elevator that was in free fall, compared to your ordinary
weight, you would weigh a) more b) less, but more than zero c) the same d) zero
40) A tin can whirled on the end of a string moves in a circle because a) once the can starts
moving, this is its natural tendency b) the can continually pulls on the string c) there is a
force on the can pulling it outward d) there is an inward force acting on the can.
_________
41) A ladybug rests on the bottom of a tin can that is being whirled horizontally on the end of a
string. Since the ladybug, like the can, goes in a circle, there must be a force on it. What exerts
this force? a) your hand b) the string c) the can d) gravity
42) A car travels in a circle at a constant speed. The net force on the car a) is directed
forward, in the direction of travel b) is directed toward the center of the curve c) is zero
because the car is not accelerating d) none of the above
43) Suppose you try loosening a nut with a wrench and the nut does not give at all. To loosen
the nut you could a) extend the lever arm b) be sure to exert a force perpendicular to the
lever arm c) exert a larger force d) all of the above
44) The time needed for a wave to make one completed cycle is called the wave’s
a) frequency b) period c) wavelength d) velocity
45) The distance between successive identical parts of a wave is called the wave’s
a) frequency b) period c) wavelength d) amplitude
46) The period of an ocean wave is 10 seconds. What is the wave’s frequency? a) 10 b) 1.0
c) 0.5 d) 0.1 Hz.
47) Suppose a bug is jiggling up and down and swimming towards you at the same time.
Compared to the frequency at which the bug is emitting waves, the frequency of the waves
reaching you is a) higher b) lower c) the same d) variable
48) As the sound f a car’s horn passes and recedes from you, the pitch of the horn seems to
a) increase b) decrease c) stay the same d) vary.
49) When a sound source moves towards you, what happens to the speed of the sound wave
from that source? a) increases b) decrease c) stays the same d) varies.
50) Sound waves cannot travel is a) air b) water c) steel d) a vacuum
_________
51) Which of the following are NOT electromagnetic waves? a) sound waves b) radio waves
c) light waves d) x-rays
52) Compared to the speed of light in air, the speed of light in water is a) less b) greater
c) the same d) depends on the temperatures of the air and water
53) What is the ultimate source of electromagnetic waves? a) TV antennas b) vibrating atoms
c) vibrating charged particles d) vibrating molecules
54) When a virtual image is created by reflection from a plane mirror a) reflected rays diverge
b) the image is located behind the mirror c) the image is upright d) all of the above
55) An echo occurs when a) sound is reflected from a distant surface b) sound is transmitted
through a surface c) sound waves are very large d) all of the above
56) When refraction occurs, part of a wave a) is bent more than another part b) slows down
before another part c) is pushed to one side d) all of the above
57) In a curved optical fiber, light a) bends and follows the curve of the fiber b) is internally
reflected in a succession of straight-line paths c) is scattered in random directions from the
fiber’s inner surface d) gains energy in each internal reflection
58) If an object is located between a converging lens and its focal point, the image will be
a) upside down b) real c) larger than the object d) all of the above
59) Constructive interference occurs when a) two waves of the same color overlap b) the
crests of two waves overlap c) the crest of one wave meets the trough of another wave d) all
of the above
60) Coulomb’s law states that the force between any two charges depends a) directly on the
size of the charges b) inversely on the square of the distance between the charges c) both of
the above d) neither of the above
_________
61) The direction of electric field lines indicates a) the strength of the electric field b) the
direction of the force on a test positive charge c) the size of the electric field d) all of the
above
62) Electrical resistance in a wire depends on the wire’s a) conductivity b) length
c) thickness d) all of the above
63) When two light bulbs are connected in series, a) the same amount of current flows through
each light bulb b) the current through each light bulb is proportional to the resistance of the
bulb c) the light bulbs will not work unless there is a fuse in the circuit d) there are at least
two branches in the circuit
64) When resistors are put in series next to each other, their overall resistance is a) larger than
that of any individual resistor b) the same as the resistance of one of the resistors c) smaller
than the resistance of any of the resistors.
65) Same question for resistors in parallel.
1) A C C D A C C B B B
11) D B C X C C B B B C
21) D C D D D A C B A D
31) A
41) C
51) A
61) B
D
B
A
D
A
D
C
A
D
B
D
A
B A D A D D
C D A B C D
A B B C B C
C