Download PhysicsMidtermREV

Physics Midterm
Multiple-Choice Questions
1. A train moves at a constant velocity of 90 km/h. How far will it move in 0.25 h?
A. 10 km
B. 22.5 km
C. 25 km
D. 45 km
E. 50 km
2. A bicyclist moves at a constant speed of 6 m/s. How long it will take for the bicyclist to move 36
m?
A. 3 s B. 6 s
B. 12 s
D. 9 s
E. 18 s
3. The graph represents the relationship between
velocity and time for an object moving in a
straight line. What is the traveled distance of the
object at 5 s?
A. 10 m
B. 15 m
C. 20 m
D. 48 m
E. 56 m
4. Which of the following is true? A. The object
increases its velocity
B. The object decreases its velocity
C. The object’s velocity stays unchanged
D. The object stays at rest
E. More information is required
5.
7. Starting from the origin, a person walks 8 km east during first day, and 5 km west the next day.
What is the net displacement of the person from the initial point in two days?
A. 6 km, east
B. 3 km, east
C. 10 km, west
D. 5 km, west
E. 9 km, east
8. Starting from the origin, a car travels 4 km east and then 7 km west. What is the net
displacement of the car from the initial point?
A. 3 km, west
B. 3 km, east
C. 4 km, east
D. 7 km, west
E. 7 km east
9. An object moves with a constant acceleration of 6 m/s2. Which of the following statements is
true?
A. The object’s velocity stays the same
B. The object moves 6 m each second
C. The object’s acceleration increases by 6 m/s2 each second
D. The object’s acceleration decreases by 6 m/s2 each second
E. the object’s velocity increases by 6 m/s each second
10. A truck travels east with an increasing velocity. Which of the following is the correct direction of
the car’s acceleration?
A.
D.
B.
C.
E.
13. An object is released from rest and falls in the absence of air resistance. Which of the following
is true about its motion? A. Its acceleration is zero
B. Its acceleration is constant
C. Its velocity is constant
D. Its acceleration is increasing
E. Its velocity is decreasing
14. A ball is thrown straight up from point A it reaches a maximum height at
point B and falls back to point C. Which of the following is true about the
direction the ball’s velocity and acceleration between A and B?
A.
B.
C.
D.
E.
15. A package is dropped from an air balloon two times. In the first trial the distance between the
balloon and the surface is H and in the second trial 4H. Compare the time it takes for the
package to reach the surface in the second trial to that in the first trial?
A.
The time in the second trial is four times greater
B.
The time in the second trial is two times greater
C.
The time the same in both trials because it doesn’t depend
on height
D.
The time in the second
trial is four times less
E.
The time in the second
trial is two times less
16. Two baseballs are thrown from the
roof of a house with the same initial
speed, one is thrown up, and the other
is down. Compare the speeds of the
baseballs just before they hit the
ground.
A. The one thrown up moves faster
because the initial velocity is
up
B. The one thrown down moves faster because the initial velocity is down
C. They both move with the same speed
D. The one thrown up moves faster because it has greater acceleration
E. The one thrown down moves faster because it has greater acceleration
19. The position and the elapsed time of a motorbike are presented by the diagram. The motorbike
starts from rest and accelerates at a constant rate. What is the average velocity of the
motorbike during first 5 s?
A. 0 m/s B. 5 m/s
C. 10 m/s D. 15 m/s
E. 20 m/s
17. An archer practicing with an arrow bow shoots an arrow straight up two
times. The first time the initial speed is v0 and second time he increases the
initial sped to 4v0. How would you compare the maximum height in the first
trial to that in the first trial?
A. Two times greater
B. Four times greater
C. Eight times greater
D. Sixteen times greater
E. The same
The velocity as a function of time of a moving object
is presented by the graph to the right.
18. How far from the origin does the object move in
first 10 s?
A. 4 m
B. 16 m
C. 20 m
D. 28 m
E. 36 m
20. The position and the elapsed time of a motorbike are presented by the diagram. The motorbike
starts from rest and accelerates at a constant rate. What is the acceleration of the motorbike?
A. 0 m/s2
B. 2 m/s2
C. 4 m/s2
D. 6 m/s2
E. 8 m/s2
21. In order for a rocket ship in deep space, far from any other objects, to move in a straight line
with constant speed it must exert a net force that is
A. proportional to its mass
B. proportional to its weight
C. proportional to its velocity
D. zero
E. proportional to its displacement
22. If a book on the dashboard of your car suddenly flies towards you, the forward velocity of the
car must have A. decreased
B. increased
C. changed direction to the right
D. become zero
E. changed direction to the left
23. A boy rides a bicycle at a constant velocity. Which of the following about the net
force is true?
A. There is a net force acting in the velocity direction
B. There is a net force acting in opposite to the velocity direction
C. The net force is zero
D. There is a net force acting perpendicularly to the velocity direction
E. None from the above
24. A passenger standing in a moving bus,
facing forward suddenly falls backward. This
can be an indication which of the following?
A. The bus speeds
B. The bus slows down
C. The bus doesn’t change its velocity
D. The bus turns to the right
E. The bus turns to the left
25. A net force F acts on a mass m and produces an acceleration a. What acceleration results if a
net force 3F acts on mass 6m?
A. a/2
B. 8a
C. 4a
D. 2a
E. a/4
26. A loaded truck collides with a car causing a huge damage to the car. Which of the following is
true about the collision?
A. The force on the truck is greater than the force
B. The force on the car is greater than the force on the truck
C. The force on the truck is the same in magnitude as the force on the car
D. During the collision the truck makes greater displacement than the car
E. During the collision the truck has greater acceleration than the car
27. Newton’s third law refers to “action-reaction forces”. These forces always occur in pairs and
A. sometimes act on the same object
B. always act on the same object
C. may be at right angles
D. never act on the same object
E. always act at right angles
28. A car traveling at 40 m/s strikes a mosquito. Which of the following is the true statement?
A. The force on the mosquito is greater than the force on the car
B. The force on the mosquito is equal to the force on the car
C. The force on the mosquito is smaller than the force on the car
D. The damage to the mosquito is equal to the damage to the car
E. None from the above
29. A railroad wagon pushes down on a railroad with a force of 400 kN. Which of the following is the
“reaction force”?
A. The wagon pulls up the Earth with 400 kN
B. The wagon pushes down the railroad with 400 kN
C. The railroad pushes up the wagon with 400 kN
D. The buoyant force pushes up the wagon with 400 kN
E. The wagon pushes down the Earth with 400 kN
30. A soccer player kicks a soccer ball with a force of 1300 N. The soccer ball hits the player with a
force of
A. less than 1300 N
B. exactly 1300 N
C. more than 1300 N
D. 0 N
E. none from the above
31. The acceleration due to gravity is higher on Jupiter than on Earth. The mass and weight of a
rock on Jupiter compared to that on Earth would be
A. same, more
B. same, less
C. more, more
D. more, less
E. same, same
32. An elevator of mass M is pulled upwards by a cable; the elevator has a positive, but decreasing,
velocity. What is the tension in the cable (neglecting the mass of the cable)?
A. less than zero
B. between zero and Mg
C. equal to Mg
D. greater than Mg
E. zero
33. An elevator of mass M is pulled upwards at constant velocity by a cable. What is the tension in
the cable (neglecting the mass of the cable)?
A. less than zero
B. between zero and Mg
C. equal to Mg
D. greater than Mg
E. zero
34. In the Atwood machine, shown on the diagram, two masses M and m are
suspended from the pulley, what is the magnitude of the acceleration of the
system? (Ignore friction and the mass of the pulley. M > m)
A.
B.
C.
D.
E.
35. In the figure to the right, two boxes of masses m and 4m are in
contact with each other on a frictionless surface. What is the
acceleration of the more massive box?
A.
B.
D.
E.
C.
36. In the figure to the right, two boxes of masses m and 4m are in
contact with each other on a frictionless surface. What is the force
causing the acceleration of the more massive box?
A. 4F
B. 3F/2
C. 5F/4
D. 4F/5
E. F/6
37. A block of mass 4m can move without friction on a horizontal table. This block is attached to
another block of mass m by a string that passes over a frictionless pulley. If the masses of the
string and the pulley are negligible, what is the magnitude of the acceleration of the descending
block?
A. g/5
B. g/4
C. g/3
D. g/7
E. g/6
38. In the figure to the right, two boxes of masses m and 3m are connected by a string while a force
F is pulling on the more massive box; what is the
tension force in the string between the boxes? A. F/m
B. F/2
C. F/4
D. F/5
E. F/6
39. Two blocks are attached by a compressed spring and are initially held at rest on a frictionless
surface. The blocks are then released simultaneously. If block I has four times the mass of block
II, which of the following quantities is the same for both blocks as the spring pushes the two
blocks away from each other?
A.
Speed
B.
Velocity
C.
Acceleration
D. Displacement
E.
Force on each block