Download True or False - Hauserphysics

Review – semester 1
Matching – match each term in column 2 with a description in column 1.
_____ . Amount of matter in an object
_____ SI unit of time
_____ Prefix meaning 1000
_____ Basic SI unit of length
_____ Basic SI unit of mass
_____ System of measurement used worldwide
_____ . The amount of space occupied by an object
a.
b.
c.
d.
e.
f.
g.
SI
kilogram
mass
kilo
second
volume
meter
True or False
1. An object can have a constant speed and a changing velocity.
2. An object can have a constant velocity and a changing speed.
3. An object can have a constant speed and be accelerating.
4. As a ball falls freely the distance it falls each second is the same.
5. If an object slows down in the positive direction it has a negative acceleration.
6. Speed and Velocity are vector quantities while distance and displacement are
scalar quantities.
7. The graph of an object that is undergoing constant acceleration is a parabolic
curve
8. The graph of an object that is undergoing constant velocity is a parabolic
curve.
9. An object can have zero velocity and still be accelerating.
10. An object can have a negative velocity and a positive acceleration.
Multiple Choice
11. Acceleration is defined as the
a. change of position divided by the time needed to make that change
b. change in velocity divided by the time needed to make that change
c. time it takes to move from one speed to another speed
d. time it takes to move from one place to another place
12. Suppose you are in a car that is going around a curve. The speedometer
reads a constant 30 miles per hour. Which of the following is not true?
a. You and the car are accelerating
b. Your speed is constant
c. Your velocity is constant
13. Suppose you go on a trip that covers 240 km in 4 hours. Your average speed
would be.
a. 480 km/hr
b. 240 km/hr
c. 120 km/hr
d. 60 km/hr
14. A car is driven 30 mi east and then 40 mi north. The total distance the car
has traveled is
a. 70 mi
b. 50 mi
c. 50 mi northeast
15. Which of the following is not true about the car in # 14
a. The magnitude of the displacement is 70 mi
b. The displacements direction is to the northeast
c. The magnitude of the displacement is something less that 70 mi
16. Suppose a car is moving in a straight line and its speed is increasing at a
constant rate. If the car moves from 35 km/hr to 40 km/hr in one second and
from 40 km/hr to 45 km/hr in the next second, what is the cars acceleration?
17. Explain why a projectile launched horizontally will hit the ground in the same amount
of time as an object that is dropped from the same height.
18. Are there any horizontal forces acting on a projectile after it is in the air? If so, what
force?
19. Are there any vertical forces acting on a projectile after it is in the air? If so, what
force?
20. What is the direction of a centripetal acceleration when an object is undergoing
circular motion?
21. True or False – a change in direction or a change of an objects speed is called inertia.
22. True or False – velocity is a vector quantity.
23. What is the shape of the curved path that a projectile takes when in flight?
a. hyperbola b. straight line
c. parabola d. principal axis
25. What is Newton’s 1st law?
26. What is Newton’s 2nd law?
27. What is Newton’s 3rd law?
28. Which has more mass, a kilogram of feathers or a kilogram of iron
d. the feathers
e. the iron
f. neither, the masses are equal
29. How much inertia would a 2kg mass have compared to 1kg of iron?
d. four times as much
e. twice as much
f. the same amount
30. A 10 N force and a 30 N force act in the same direction on an object. What is the net
force on the object?
a. 40 N b. 30 N
c. 20 N
d. 10 N
31. A 10 N force and a 30 N force act in opposite directions on an object. What is the net
force on the object?
a. 40 N b. 30 N
c. 20 N
d. 10 N
32. If the force acting on a cart is doubled, but the mass of the cart remains the same,
what happens to the cart’s acceleration?
a. it doubles
b. it stays the same c. it is cut in half
d. it is quartered
e. Forces always occur
a. when velocities are constant b. as single quantities c. in pairs
True or False
33._____The amount of matter in an object is called the weight of the object.
34. _____The letter “g” is the symbol for the acceleration due to gravity.
35. _____The Metric unit of force is the kilogram.
36. _____If a hockey puck slides on a perfectly frictionless surface, it will eventually
slow down because of its inertia.
37. _____Inertia is the resistance any material object has to a change in its state of
motion.
38. _____Gravitational force acting between two objects is directly proportional to
how much mass those objects have.
39. _____The Law of Inertia applies to objects that are not moving, but not to objects
that are moving.
40. _____The farther two objects are away from each other, the less gravitational
force they will exert on each other.
41. _____An object with a mass of 2 kg will have the same amount of inertia as one
with a mass of 3 kg.
42. _____Mass is the amount of space an object occupies.
43. Kinetic Energy is the energy of _____________
44. Potential Energy is energy that is __________ because of its position
45. Work requires that a force is exerted on an object and consequently the object
____________
46. The law of conservation of energy states that the total energy in a system
________________________________________________________________________
_______________________________________________________________________
47. A roller coaster car starts from rest on the top of the first hill. At the top the car has
__________ energy, but as it accelerates down the hill it gains___________energy and
loses___________energy. When it gets the the lowest point of the ride it has only
__________energy.
48. If the track was frictionless, how much energy would the car have at the bottom of
the hill as compared to how much it had at the top of the hill?
Same
More than at top
Less than at top
Problems
49. Motion - A car starts from rest and speeds up in the positive direction for 6.0 s with
a uniform acceleration of 1.5 m/s/s. The driver then applies the brakes and slows down
for 2.5 seconds in the positive direction with an acceleration of - 2.0 m/s/s.
a. How fast is the car going at the end of the braking period?
b.
How far has the car gone from its start?
c. What was the average velocity of the car for the whole trip?
50. Projectile motion - A box of supplies is dropped from an airplane which is located a
vertical distance of 340 m above a lake. If the plane has a horizontal velocity of 70 m/s,
what horizontal distance will the box travel before striking the water?
51. A 20kg box is pulled by a rope horizontally at a constant velocity with 100N of
force. What is the coefficient of friction between the box and the floor?
52. A. What is the net force on an object that has the following individual forces
acting on it?
 6N East
 20N North
 12N South
B. What is the acceleration of the object if its mass is 2.0kg?
Position vs. Time
60
50
40
P
o
si
ti 30
o
n
(
m
20
)
10
0
0
5
10
15
20
25
Time (s)
Based upon the graph shown above, answer the following questions. Place the letter of
the best answer on the line provided. (Questions 12-17)
Choose from the following answers:
(A) constant speed in positive direction
(B) constant acceleration in positive direction
(C) object is at rest
(D) constant speed in negative direction
(E) constant acceleration in negative direction
53. What type of motion is occurring between t = 0s and t = 5s?
54. What type of motion is occurring between t = 5s and t = 10s?
55. What type of motion is occurring between t = 10s and t = 15s?
56. What type of motion is occurring between t = 15s and t = 20s?