# Physics 101 Exam 1

42 Questions

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.

• E.

• 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 ball is thrown upwards. Neglecting air resistance, what initial upward speed does the ball need to remain in the air for a total time of 10 seconds?
• A.

• B.

• C.

• D.

• E.

• 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.

• 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.

• C.

• 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.

• 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.

• B.

• C.

• D.

• 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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