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Review of Dynamics
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1. Who provided a basis for the study of dynamics?
Galileo
Newton
Kepler
Einstein
2. What are the units of force, in terms of fundamental units?
Newtons
kg·m
3. Inertia is the tendency of an object to remain at constant
Acceleration
Position
Speed
Velocity
4. Which of the following constitutes an inertial reference frame?
A satellite in orbit
An object moving in uniform circular motion
A car moving with constant velocity
An object in free fall
5. What is the weight on earth of a 50 kg person?
490 N
9.8 N
50 N
Not enough information
6. What is the weight of a 50 kg person in outer space?
490 N
50 N
O N
Not enough information
7. In what way are force and acceleration related?
Inversely proportional
Directly proportional
F
is proportional to
a
^{2}
There is no relation
8. A 10 kg mass experiences a force of 20 N. What is its acceleration?
2 m/s
200 m/s
0.5 m/s
20 m/s
9. An object with mass 2 kg moves with a velocity of 10 m/s. What is the net force on the body?
20 N
0 N
5 N
20 N
10. What are the units of weight, in terms of fundamental units?
Newtons
kg
11. An object of mass 1 kg experiences two equal and opposite forces, each of 10 N. What is its acceleration?
20 m/s
^{2}
10 m/s
^{2}
0
12 N
12. A force of 3 N and a force of 4 N act together to produce a resultant force of 5 N. What must be the angle between them?
0
90
180
Not enough information
13. The net force from two distinct forces is at a maximum when the angle between them is
0
45
180
90
14. Three forces, each separated from one another by
120
^{o}
yield a net force of 0. What can be said about the magnitude of the forces?
They add to 0
The sum of the magnitude of two forces must equal the magnitude of the third force
They are all equal
Not enough information
15. An object is said to be at equilibrium if
It is moving at constant velocity
It is moving at constant acceleration
No forces act upon it
No net force acts upon it
16. A man pushes on a 10 kg crate with a force of 50 N. What force does the man experience?
50 N
500 N
5 N
0 N
17. What is constant for a freely falling object?
Velocity
Position
Speed
Acceleration
18. The acceleration due to gravity on the moon is 1/6 the value of that on earth. What is the weight of a 100 kg man on the moon?
163 N
100 N
17 N
238 N
19. Which of Newton's Laws relate the force of two mutually interacting bodies?
1st
2nd
3rd
4th
20. Which of Newton's Laws define the concept of inertia?
1st
2nd
3rd
4th
21. Two surfaces are in contact. The normal force between them always points
Vertically
Perpendicular to the plane of contact
Horizontally
Parallel to the plane of contact
22. A 10 kg mass rests on an inclined plane with angle of elevation of
θ
. What is the magnitude of the normal force?
98 N
10 N
98 sin
θ
N
98 cos
θ
N
23. The normal force is a direct consequence of which of Newton's Laws?
1st
2nd
3rd
4th
24. Frictional force is the result of what kind of fundamental force?
Gravitational Force
Nuclear Force
Normal Force
Electrical Force
25. Frictional force always acts in what direction relative to the motion of one body relative to the other?
In the opposite direction as the motion of the body it is being acted upon.
Perpendicular to the plane of motion
In the same direction as the motion of the body it is being acted upon.
Horizontally
26. A 10 kg block is at rest on a horizontal table. The coefficient of static friction between them is .5. What is the frictional force acting upon the block?
49 N
5 N
0 N
98 N
27. A 10 kg block lies at rest on a table, with a coefficient of static friction between them of .5. A horizontal force is then applied of magnitude 50 N. What is the frictional force acting upon the block after the force is applied?
48 N
0 N
98 N
Not enough information
28. The coefficient of static friction is related to the coefficient of kinetic friction in what way?
The coefficient of static friction is always less than the coefficient of kinetic friction
They are equal
The coefficient of static friction is always greater than the coefficient of kinetic friction
Not enough information
29. A block moves across a tabletop with a certain speed and experiences a kinetic frictional force. What happens to the frictional force when the speed of the block is doubled?
The force is doubled
The force is quadrupled
The force is halved
The force remains the same
30. A 10 kg block lies at rest on table. The coefficient of static friction and the coefficient of kinetic friction between the block and the table are .5 and .25 respectively. A 50 N force is applied horizontally to the block. What is the magnitude of the frictional force applied to the block?
24.5 N
49 N
50 N
0 N
31. See the above problem. What is the acceleration of the block while the force is being applied, in m/s
^{2}
?
.1
2.55
5
2.45
32. Kinetic frictional force is always directly proportional to what other force?
Electrical force
Gravitational Force
Tension Force
Normal Force
33. A 2 kg block is moving with constant velocity across a table with a coefficient of kinetic friction of .5. How much external force is being applied to the block?
9.8 N
O N
18 N
24.5 N
34. The net force on a massless rope is always
The vector sum of the tension on the rope.
9.8 N
0 N
Not enough information
35. A 10 kg block is held in equilibrium by a rope hanging vertically from the ceiling. What is the tension in the rope?
10 N
49 N
5 N
98 N
36. A man attaches a rope to a 20 kg block, pulling it across a floor with constant velocity. The coefficient of kinetic friction between the block and the floor is .5. What is the tension in the rope?
98 N
196 N
20 N
Not enough information
37. A cube has sides of area 2 cm
^{2}
, 3 cm
^{2}
and 4 cm
^{2}
. What side of the cube will experience the least friction when moved across a rough surface?
The 2 cm
^{2}
side
The 3 cm
^{2}
side
The 4 cm
^{2}
side
Each side experiences the same amount of friction.
38. A 10 kg block is placed on a floor, but attached to a rope via a pulley system. A person pulls on the rope until the tension in the rope is 90 N. What is the normal force exerted by the floor at this point?
0 N
98 N
8 N
106 N
39. If the normal force between two surfaces is doubled, the coefficient of static friction will
Double
Be halved
Remain the same
Quadruple
40. A 10 kg block is pushed horizontally against a vertical wall, with coefficient of static friction of .25 between the block and the wall. With what force must the block be pushed against the wall in order to keep the block from falling?
24.5 N
392 N
49 N
98 N
41. When traveling in uniform circular motion, all of the following stay constant EXCEPT
Speed
Acceleration
Radius
Velocity
42. When moving in uniform circular motion, the acceleration of a particle is always
Directed toward the center of the circle
Proportional to the velocity of the particle
Proportional to the radius of the circle
Directed away from the center of the circle
43. A particle is accelerated in uniform circular motion at a rate of 2 m/s
^{2}
, around a circle of radius of 18 m. What is the particle's speed, in m/s?
36
9
6
3
44. A 10 m rope has a maximum tension of 20 N. What is the most mass it can keep in uniform circular motion at a velocity of 10 m/s?
2 kg
20 kg
10 kg
100 kg
45. Centripetal force always points in what direction?
Tangential to the circle
Away from the center of the circle
Toward the center of the circle
Perpendicular to the plane of the circle
46. When a car goes around a curve, the centripetal force is provided by
The normal force
The kinetic frictional force
The gravitational force
The static frictional force
47. Which of the following is NOT an example of uniform circular motion?
A planet orbiting the sun
The earth rotating about its axis
A cylinder rolling down an incline
A car going around a curve at constant velocity
48. How much must the centripetal force change if the speed around a circle is doubled?
It must be doubled
It must be quadrupled
It must be halved
It must stay the same
49. How much must the centripetal force change if the radius of the circle is doubled?
It must be doubled
It must be quadrupled
It must be halved
It must stay the same
50. Which of Newton's Laws do NOT apply to uniform circular motion?
1st
2nd
3rd
None of the above
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