1. A car travels 30 miles at an average speed of 60 mph and then travels 30 miles at an
average speed of 30 mph. The average speed of the car for this 60 mile trip is
(a) 35 mph
(b) 40 mph
(c) 45 mph
(d) 50 mph
2. Throughout a time interval, while the speed of a particle increases as it moves along the x
axis, its velocity and acceleration might be
(a) positive and negative, respectively
(b) negative and negative, respectively
(c) negative and positive, respectively
(d) positive and zero, respectively
3. A particle moves along the x axis. When its acceleration is positive and increasing
(a) its velocity must be positive
(b) its velocity must be negative
(c) it must be speeding up
(d) none of the above must be true
4. Which one of the following statements is correct for a falling object released from rest
(a) the average velocity during the first second of time is 4.9 m/s
(b) during each second the object falls 9.8 m
(c) the acceleration changes by 9.8 m/s every second
(d) the acceleration of the object is proportional to its weight
5. A plane traveling north at 200 m/s turns and then travels south at 200 m/s. The change in its
velocity is
(a) zero
(b) 200 m/s North
(c) 400 m/s North
(d) 400 m/s South
6. A bomber flying in level flight must release its bomb before it is over the target. Neglecting air
resistance, which of the following is NOT true?
(a) the bomber will be over the target when the bomb strikes
(b) the bomb travels in a curved path
(c) the time of flight of the bomb is independent of the horizontal speed of the plane
(d) the horizontal velocity of the plane equals the vertical velocity of the bomb when it hits the
target
7. An object is shot from the back of a truck moving at 30 mph on a straight horizontal road. The
launcher is aimed upward perpendicular to the bed of the truck. Neglecting air resistance, the
object falls (a) in front of the truck
(b) behind the truck (c) on the bed of the truck
(d) depends on the initial speed of the
object
8. Sam is riding his bicycle from Pratt to Glenwood at 12 mph. Sally is riding her bicycle back
from Glenwood to Pratt at 12 mph. As they pass each other,
(a) their speeds are identical and their velocities are identical
(b) their speeds are identical and their velocities are different
(c) their speeds are different and their velocities are identical
(d) their speeds and their velocities are different
9. A package of supplies is dropped from a plane, and one second later a second package is
dropped. Neglecting air resistance, the distance between the packages
(a) will be constant
(b) will decrease
(c) will increase
(d) will depend on their weight
10. Two heavy balls are released at the same time from a height of 50 m above the floor. One is
thrown vertically downward with an initial velocity of 5 m/s while the other has a horizontal
velocity of 5 m/s when released. Then
(a) the ball with the horizontal velocity strikes the floor first
(b) the balls hit the floor at the same time
(c) the balls have the same acceleration when they strike the floor
(d) the balls have the same velocity when they strike the floor
11. In which of the following examples is the motion of the car not accelerated?
(a) A car turns a corner at a constant speed of 20 mi/hr.
(b) A car climbs a steep hill with its speed dropping from 60 mi/hr at the bottom to 15 mi/hr at
the top.
(c) A car climbs a steep hill at a constant speed of 40 mi/hr.
(d) A car climbs a steep hill and goes over the crest and down on the other side all at the
speed of 40 mi/hr.
12. A student shoots an archery arrow in a high arc toward a target located some distance away.
At the highest point in its path, the arrow’s
(a) velocity and acceleration are both nonzero
(b) velocity is zero but its acceleration is nonzero
(c) velocity is nonzero but its acceleration is zero
(d) velocity and acceleration are both zero
13. A particle moves with constant speed in a circular path. The instantaneous velocity and the
instantaneous acceleration vectors are
(a) both tangent to the circular path (b) opposite each other
(c) both perpendicular to the circular path
(d) perpendicular to each other
14. A stone is ties to a string and whirled at constant speed in a horizontal circle. The speed is
then doubled without changing the length of the string. Afterwards, the magnitude of the
acceleration of the stone is
(a) the same
(b) twice as great
(c) four times as great
(d) half as great
15. Two projectiles are in flight at the same time. The acceleration of one relative to the other
(a) is always 9.8 m/s2
(b) can be as large as 9.8 m/s2
(c) can be horizontal
(d) is zero
(e) none of these
16. A heavy truck and a light truck are both traveling at the same speed on the same roadway. If the
coefficient of static friction between their tires and the road are the same, which vehicle will be able to
stop in the shortest distance?
(a) the car
(b) the truck
(c)both will be able to stop in the same distance
(d) cannot tell with knowing their coefficient of kinetic friction
(a) cannot tell without knowing their individual masses
17. The mass and weight of a body
(a) differ by a factor of 9.8
(b) are the same physical quantities expressed in different units
(c) have the same ratio as that of any other body placed at that location
(d) are both a direct measure of the inertia of the body
18. A physics textbook is suspended on a spring scale in an elevator. Of the following, the scale
shows the highest reading when the elevator
(a) moves upward with increasing speed
(b) moves upward with decreasing speed
(c) moves downward with increasing speed (d) moves downward at constant speed
19. A book rests on a table, exerting a downward force on the table. The reaction to this force is
(a) the force of the earth on the book
(b) the force of the table on the book (c) the force of the earth on the table
(d) the force of the book on the earth
20. A horizontal force of 12 N pushes a 0.5 kg block against a vertical wall. The block is initially at
rest. If s
k
(a) the frictional force is 4.9 N
(b) the frictional force is 7.2 N
(c) the normal force is 4.9 N (d) the block will start moving and accelerate
21. The driver of a 1000 kg car tries to turn through a circle of radius 100 m on an unbanked
curve at a speed of 10 m/s. The actual frictional force between the tires and slippery road is
900 N. The car will (a) slide into the inside of the curve
(b) make the turn
(c) slow down due to the frictional force
(d) slide off to the outside of the curve.