Physics 101 Exam 1
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Final exam
- 1.Science is a body of knowledge that
- A.
Condenses knowledge into testable laws
- B.
Describes order in nature
- C.
Is an ongoing activity of humans
- D.
All of the above choices are correct
- E.
None of the above choices are correct
- 2.As an object freely falls downward, its
- A.
Acceleration increases
- B.
Velocity increases
- C.
Both of these
- D.
None of these
- 3.
- A.
The milk carton has inertia
- B.
The milk carton has no acceleration
- C.
There is an action-reaction pair of forces
- D.
Gravity tends to hold the milk carton secure
- E.
None of these
- 4.The gain in speed each second for a freely-falling object is about
- A.
0
- B.
20 m/s
- C.
5 m/s
- D.
10 m/s
- E.
Depends on the initial speed
- 5.A package falls of a truck that is moving at 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is
- A.
More than 30 m/s
- B.
Zero
- C.
Less than 30 m/s but larger than zero
- D.
About 30 m/s
- E.
More information is needed for an estimate
- 6.According to Newton's law of inertia, a rail road train in motion should continue going forever even if its engine is turned off. We never observe this because railroad trains.
- A.
Are much too heavy
- B.
Move too slowly
- C.
Must go up and down hills
- D.
Always have forces that oppose their motion
- 7.A scientific statement that can never be changed is a scientific
- A.
Principle
- B.
Theory
- C.
Hypothesis
- D.
Law
- E.
None of the above choices are correct
- 8.If no external forces are acting on a moving object it will
- A.
Continue moving at the same velocity
- B.
Move slower and slower until it finally stops
- C.
Continue moving at the same speed
- 9.Galileo's use of inclined planes allowed him to effectively
- A.
Eliminate the acceleration of free fall
- B.
Increase the acceleration beyond that of free fall
- C.
Slow down the acceleration of free fall
- D.
Eliminate friction
- 10.The two measurements necessary for calculating average speed are
- A.
Distance and acceleration
- B.
Velocity and distance
- C.
Acceleration and time
- D.
Velocity and time
- E.
Distance and time
- 11.A horse gallops a distance of 10 kilometers in a time of 30 minutes. It's average speed is
- A.
15 km/h
- B.
30 km/h
- C.
20 km/h
- D.
40 km/h
- 12.A car maintains a constant velocity of 100 km/hr for 10 seconds. During this interval it acceleration is
- A.
Zero
- B.
1000 km/hr
- C.
110 km/hr
- D.
10 km/hr
- 13.A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected the force required to keep the puck sliding at constant velocity is
- A.
Equal to its weight divided by its mass
- B.
Zero
- C.
Equal to the product of its mass times its weight
- D.
Equal to its weight
- 14.
- A.
50 m/s
- B.
100 m/s
- C.
10 m/s
- D.
More than 100 m/s
- 15.If an object moves with constant acceleration, its velocity must
- A.
Be constant also
- B.
Change by the same amount each second
- C.
Always decrease
- D.
Change b varying amounts depending on its speed
- 16.A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always
- A.
Opposite its velocity
- B.
Directed downward
- C.
In the direction of motion
- D.
Directed upward
- 17.If a car accelerates form rest at 2 meters per second per second, its speed 3 seconds later will be about
- A.
2 m/s
- B.
6 m/s
- C.
4 m/s
- D.
3 m/s
- 18.At on instant an object in free fall is moving downward at 50 meters per second. One second later is speed should be about
- A.
25 m/s
- B.
100 m/s
- C.
55 m/s
- D.
60 m/s
- E.
50 m/s
- 19.Starting from rest, the distance a freely-falling object will fall in 1.0 second is about
- A.
10 m
- B.
2.00 m
- C.
5.0 m
- D.
None of the above
- 20.An object falls freely from rest on a planet where the acceleration due to gravity is 20 meters per second squared. After 5 seconds, the object will have a speed of
- A.
20 m/s
- B.
10 m/s
- C.
50 m/s
- D.
5 m/s
- E.
100 m/s
- 21.
- A.
Greater than 9.8 meters per second per second
- B.
Less than 9.8 meters per second per second
- C.
9.8 meters per second per second
- 22.If a projectile is fired straight up at a speed of 10 m/s, the total time to return to its starting position is about
- A.
2 seconds
- B.
20 seconds
- C.
10 seconds
- D.
1 second
- E.
Not enough information to estimate
- 23.When a rock thrown straight upwards gets tot he exact top of its path, its
- A.
Velocity is zero and its acceleration is zero
- B.
Velocity is about 10 m/s and its acceleration is zero
- C.
Velocity is zero and its acceleration is about 10 meters per second per second
- D.
Velocity is about 10 m/s and its acceleration is about 10 meters per second per second
- E.
None of these
- 24.
- A.
About 80 m/s
- B.
About 60 m/s
- C.
About 110 m/s
- D.
About 100 m/s
- E.
About 50 m/s
- 25.Which has a greater mass?
- A.
An automobile battery
- B.
A king-size pillow
- C.
Neither- both have the same
- 26.Strange as it may seem, it is just as hard to accelerate a car on a level surface on the oon as it is here on the Earth. This is because
- A.
The weight of the car is independent of gravity
- B.
The mass of the car is independent of gravity
- C.
Nonsense! a car is much more easily accelerated on the moon than on the Earth
- 27.The newton is a unit of
- A.
Force
- B.
Inertia
- C.
Density
- D.
Mass
- 28.A rock weighs 30 N on Earth. A second rock weighs 30 N on the moon. Which of the two rocks has the greater mass? (gravity on the moon is one-sixth of that on Earth)
- A.
The one on the moon
- B.
The one on Earth
- C.
They have the same mass
- D.
Not enough information to say
- 29.A 10-kg brick and 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is
- A.
Zero
- B.
The same as the force on the 1-kg book
- C.
One-tenth as much
- D.
10 times as much
- 30.The force of friction on a sliding object is 10 newtons. The applied force needed to maintain a constant velocity is
- A.
Less than 10 N
- B.
More than 10 N
- C.
10 N
- 31.Whenever the net force on an object is zero, its acceleration
- A.
Is zero
- B.
May be less than zero
- C.
May be more than zero
- 32.A 1-kg mass at the earth's surface weighs
- A.
1 N
- B.
4.9 N
- C.
10.8 N
- D.
9.8 N
- E.
None of these
- 33.A 10-N falling object encounters 4 N of air resistance. The net force on the object is
- A.
4 N
- B.
10 N
- C.
6 N
- D.
0 N
- E.
None of these
- 34.An object is propelled along a straight-line path by a force. If the net force were doubled, the object's acceleration would be
- A.
Four times as much
- B.
Half as much
- C.
Twice as much
- D.
The same
- E.
None of these
- 35.An object is propelled along a straight-line path in space by a force. If the mass of the object somehow becomes twice as much, its acceleration
- A.
Halves
- B.
Doubles
- C.
Quadruples
- D.
Stays the same
- E.
None of these
- 36.Hang from a pair of gym rings and the upward support forces of the rings will always
- A.
Each be equal to your weight
- B.
Add up to equal your weight
- C.
Each be half your weight
- 37.A tow truck exerts a force of 3000 N on a car, accelerating it at 2 meters per second per second. What is the mass of the car?
- A.
1500 kg
- B.
500 kg
- C.
1000 kg
- D.
3000 kg
- E.
None of these
- 38.An object following a straight-line path at constant speed
- A.
Has zero acceleration
- B.
Has a net force acting upon it in the direction of motion
- C.
Has no forces acting on it
- D.
None of these
- 39.
- A.
Theoretically tends to accelerate toward the speed of light
- B.
Decelerates gradually to a halt
- C.
Is brought to a rapid halt
- D.
Continues at the speed it had when it encountered the second force
- E.
None of these
- 40.The brakes of a speeding truck are slammed on and it skids to a stop. If the truck were heavily loaded so that it had twice the total mass, the skidding distance would be
- A.
4 times as far
- B.
2 times as far
- C.
1/2 as far
- D.
1 1/2 times as far
- E.
The same
- 41.If you are driving at 20 m/s and slam on your brakes and skid at 0.5 g (5m/s/s) to a full stop, the skidding time in seconds is
- A.
About 5
- B.
About 6
- C.
About 4
- D.
About 3
- E.
More than 6
- 42.If more horizontal force is applied to a sliding object than is needed to maintain a constant velocity,
- A.
The friction force increases
- B.
The object accelerates opposite the direction of the applied force
- C.
The object accelerates in the direction of the applied force
- D.
Two of the above
- E.
None of the above
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