Download Physics Final Exam Review

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Physics Final Exam Review
1.______ Speed measurements are given in units of:
a. Distance/time
b. Distance/ time2
c. Time2/distance
d. Time/distance
2.______
a.
b.
c.
d.
Measurements of acceleration are given in units of:
Distance/time
Distance/ time2
Time2/distance
Time/distance
3.______
a.
b.
c.
d.
An airplane that moves 180,000 meters in one hour has a speed of:
500 m/s
1800 m/s
50 m/s
5,000 m/hr
4.______ A car traveling at 25 m/s speeds up to 40m/s over a period of 15 seconds. The average
acceleration of the car is:
a. 1m/s2
b. 1m/s
c. 15 m/s
d. 15 m/s2
5.______
a.
b.
c.
d.
It can be important to know the velocity of an object, not just its speed, because:
Velocity also tells acceleration
Speed is always an average
Velocity also tells direction
Speed is only useful for fast-moving objects
6.______ A runner starts a 5-km race at 10:15 am and finishes at 10:35 am. Given this information you
can calculate the runner’s:
a. velocity
b. average speed
c. acceleration
d. more than one of these
7.______
a.
b.
c.
d.
The velocity of an object includes
Speed only
Distance only
speed and direction
acceleration
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True or False
8.______
9.______
An object cannot be accelerating if it has a constant speed.
If you know the speed of an object you also know the direction of movement.
10.______ Instantaneous speed is the total distance traveled divided by the total time of travel.
11.______ It is possible to have a negative acceleration.
Essay
12.______ Explain a situation in which you can accelerate even though your speed doesn’t change.
13.______ A jogger runs at a constant velocity of 3m/s for 5 seconds. She then slows to a speed of 1m/s in
the same direction for a time of 5 seconds. She sprints the last leg of the jog at 6 m/s for 5 seconds.
Find the total displacement.
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14.______
a.
b.
c.
d.
Which of the following relationships is correct?
1 N = 1 kg
1 N= 1kgm
1 N= 1kgm/s
1 N= 1kgm/s2
15.______
a.
b.
c.
d.
When a pair of balanced forces acts on an object, the net force that results is:
Greater in size than both forces combined
Greater in size than one of the forces
Equal is size to one of the forces
Equal to zero
16.______
a.
b.
c.
d.
As you push a box across a table, the friction acting on the box:
Acts in the direction of the motion
Equals the weight of the box
Acts in the direction opposite to the motion
None of these
17.______
a.
b.
c.
d.
An open parachute increase air resistance of a falling sky diver by:
Decreasing the weight of the diver
Increasing surface area
Increasing terminal velocity
Reducing friction
18.______ The acceleration due to gravity on the surface of Mars is about 1/3 the acceleration due to
gravity on Earth’s surface. The weight of a space probe on the surface of Mars is about:
a. 9 times greater than its weight on Earth’s surface
b. 3 times greater than its weight on Earth’s surface
c. 1/3 its weight on Earth’s surface
d. The same as its weight on Earth’s surface
19.______
a.
b.
c.
d.
In which of the following are action reaction forces involved:
When a bat strikes a ball
When stepping from a curb
When rowing a boat
All of these
20.______
a.
b.
c.
d.
When an unbalanced force acts on an object:
The object’s motion does not change
The object accelerates
The weight of the object decreases
The weight of the object increases
21.______
a.
b.
c.
d.
The property of matter that resists change in its motion is:
acceleration
gravity
inertia
weight
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22.______ According to Newton’s 2nd law of motion, the acceleration of an object equals the net force
acting on the object divided by the object’s:
a. mass
b. momentum
c. velocity
d. weight
23.______
a.
b.
c.
d.
Your weight equals your:
mass
mass times acceleration due to gravity
mass divided by the net force acting on you
mass times speed
24.______
a.
b.
c.
d.
Newton’s 3rd law of motion describes:
Action reaction forces
Inertia
Centripetal forces
Net force
25.______
a.
b.
c.
d.
The product of an object’s mass and velocity is it’s:
Frictional force
Momentum
Net force
Weight
26.______
a.
b.
c.
d.
What is conserved when 2 objects collide in a closed system?
acceleration
momentum
speed
velocity
27.______
a.
b.
c.
d.
As an astronaut travels far away from earth her weight:
Decreases because gravity decreases
Decreases because her mass decreases
Increases because gravity increases
Remains the same because her mass remains the same
28.______ How can arrows be used to represent the size and direction of a force? Give an example:
29.______ In terms of Newton’s 2nd law, explain why you should wear your seat belt.
30.______ A billiard ball with a momentum of 20kgm/s strikes a 2nd ball at rest. What is the change in
momentum of the 2nd ball?
31.______ Explain terminal velocity.
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32.______
a.
b.
c.
d.
A force acting on an object does no work if
A machine is used to move the object
The force is not in the direction of the object’s motion
The force is greater than the force of friction
The object accelerates
33.______
a.
b.
c.
d.
In which of the following is no work done
Climbing stairs
Lifting a book
Pushing a shopping cart
Work is done is all of these examples
34.______
a.
b.
c.
d.
What is the unit of work?
Joule
Newton/ joule
Watt
All of these
35.______
a.
b.
c.
d.
What is the unit of power?
Joule
Newton
Newton-meter
Watt
36.______
a.
b.
c.
d.
Energy in the form of motion:
Kinetic Energy
Potential Energy
Thermal Energy
Atomic Energy
37.______
a.
b.
c.
d.
According to the law of conservation of energy:
Energy can neither be created nor destroyed
Energy can be converted from one form to another
Kinetic Energy can be changed into sound and heat
More than one of these
38.______
a.
b.
c.
d.
A rock sitting at the edge of a cliff has_____ because of its position.
Kinetic Energy
Potential Energy
Thermal Energy
Atomic Energy
39.______
a.
b.
c.
d.
When you put on the brakes on your bike friction causes kinetic energy to be converted into:
Heat
Sound
Potential Energy
More than one of these
40.______
a.
b.
c.
d.
The kinetic energy of an object increases as ___ increases.
Acceleration due to gravity
velocity
height
volume
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41.______
a.
b.
c.
d.
An object’s potential energy is directly related to all of the following except:
Its height
Its mass
Its speed
Its acceleration due to gravity
42.______ A 4 kg cat is resting on top of a bookshelf that is 2 meters high. What is the cat’s potential
energy?
a. 6J
b. 8J
c. 20J
d. 78J
43.______
a.
b.
c.
d.
The energy stored in a spring is:
Chemical Potential Energy
Gravitational Potential Energy
Kinetic Energy
Elastic Potential Energy
44.______ Why is the potential energy of an object 1 m above the moon’s surface less than its potential
energy 1 m above earth’s surface?
a. Its mass is less on the moon
b. It’s weight is more on the moon
c. Acceleration due to gravity is greater on the moon
d. Acceleration due to gravity is smaller on the moon
45.______
a.
b.
c.
d.
If no friction acts on a diver during a dive, which of the following statements is true?
The potential energy at the beginning is equal to the kinetic energy at the end
Some energy is converted to heat
Some energy is converted to sound
More than one of these
46.______
a.
b.
c.
d.
If friction does act on a diver during a dive, which of the following statements is true?
The potential energy at the beginning is equal to the kinetic energy at the end
Some energy is converted to heat
Some energy is converted to sound
More than one of these
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Use the diagram to answer the following questions:
47.______
a.
b.
c.
d.
Potential energy is the greatest at:
A and E
C
D
B
48.______
a.
b.
c.
d.
Kinetic energy is the greatest at point:
A
B
C
D