
1 The diagram below shows a worker using a rope to pull a cart.
The worker's pull on the handle of the cart can best be described as a force having
(1) magnitude, only
(2) direction, only
(3) both magnitude and direction
(4) neither magnitude nor direction


2 A car travels 90. meters due north in 15 seconds. Then the car turns around
and travels 40. meters due south in 5.0 seconds. What is the magnitude
of the average velocity of the car during this 20.second interval?
(1) 2.5 m/s
(2) 5.0 m/s
(3) 6.5 m/s
(4) 7.0 m/s


3 How far will a brick starting from rest fall freely in 3.0 seconds?
(1) 15 m
(2) 29 m
(3) 44 m
(4) 88 m


4 If the sum of all the forces acting on a moving object is zero, the object will
(1) slow down and stop
(2) change the direction of its motion
(3) accelerate uniformly
(4) continue moving with constant velocity


5 A net force of 10. newtons accelerates an object at 5.0 meters per
second^{2}. What net force would be required to accelerate the same object
at 1.0 meter per second^{2}?
(1) 1.0 N
(2) 2.0 N
(3) 5.0 N
(4) 50. N


6 The graph below represents the relationship between gravitational force and mass
for objects near the surface of Earth.
The slope of the graph represents the
(1) acceleration due to gravity
(2) universal gravitational constant
(3) momentum of objects
(4) weight of objects


7 A 1,200kilogram car traveling at 10. meters per second hits a tree and
is brought to rest in 0.10 second. What is the magnitude of the average force
acting on the car to bring it to rest?
(1) 1.2 × 102 N
(2) 1.2 × 103 N
(3) 1.2 × 104 N
(4) 1.2 × 105 N


8 A spring scale reads 20. newtons as it pulls a 5.0kilogram mass
across a table. What is the magnitude of the force exerted by the mass on the spring
scale?
(1) 49 N
(2) 20. N
(3) 5.0 N
(4) 4.0 N

Base your answers to questions 9 and 10 on the information below.
A 2.0 × 10^{3}kilogram car travels at a constant speed of 12 meters
per second around a circular curve of radius 30. meters.


9 What is the magnitude of the centripetal acceleration of the car as it goes around
the curve?
(1) 0.40 m/s2
(2) 4.8 m/s2
(3) 800 m/s2
(4) 9,600 m/s2


10 As the car goes around the curve, the centripetal force is directed
(1) toward the center of the circular curve
(2) away from the center of the circular curve
(3) tangent to the curve in the direction of motion
(4) tangent to the curve opposite the direction of motion


Note that question 11 has only three choices.
11 The diagram below shows a block sliding down a plane inclined at angle face="Symbol">
q with the horizontal.
As angle face="Symbol">q is increased, the coefficient of kinetic friction
between the bottom surface of the block and the surface of the incline will
(1) decrease
(2) increase
(3) remain the same


12 The amount of work done against friction to slide a box in a straight line across
a uniform, horizontal floor depends most on the
(1) time taken to move the box
(2) distance the box is moved
(3) speed of the box
(4) direction of the box's motion


13 A 1.2kilogram block and a 1.8kilogram block are initially at
rest on a frictionless, horizontal surface. When a compressed spring between the
blocks is released, the 1.8kilogram block moves to the right at 2.0
meters per second, as shown.
What is the speed of the 1.2kilogram block after the spring is released?
(1) 1.4 m/s
(2) 2.0 m/s
(3) 3.0 m/s
(4) 3.6 m/s


14 An object weighs 100. newtons on Earth's surface. When it is moved to
a point one Earth radius above Earth's surface, it will weigh
(1) 25.0 N
(2) 50.0 N
(3) 100. N
(4) 400. N


15 An object weighing 15 newtons is lifted from the ground to a height of 0.22
meter. The increase in the object's gravitational potential energy is approximately
(1) 310 J
(2) 32 J
(3) 3.3 J
(4) 0.34 J


Note that question 16 has only three choices.
16 As an object falls freely, the kinetic energy of the object
(1) decreases
(2) increases
(3) remains the same


17 Moving 2.5 × 10^{6} coulomb of charge from point A to point B
in an electric field requires 6.3 × 10^{4} joule of work. The potential
difference between points A and B is approximately
(1) 1.6 × 10^{9} V
(2) 4.0 × 10^{3} V
(3) 2.5 × 10^{2} V
(4) 1.0 × 10^{14} V


18 A 3.0kilogram block is initially at rest on a frictionless, horizontal
surface. The block is moved 8.0 meters in 2.0 seconds by the application
of a 12newton horizontal force, as shown in the diagram below. What is the average
power developed while moving the block?
(1) 24 W
(2) 32 W
(3) 48 W
(4) 96 W


19 The diagram below shows three neutral metal spheres, x, y, and z, in contact
and on insulating stands.
Which diagram best represents the charge distribution on the spheres when a positively
charged rod is brought near sphere x, but does not touch it?


20 Which graph best represents the electrostatic force between an alpha particle
with a charge of +2 elementary charges and a positively charged nucleus as a function
of their distance of separation?
