# Physics Semester Exam 1

16 Questions | Total Attempts: 714  Settings  Physics. It’s the study of matter, motion and behaviour through space and time, with elements related to energy and force. It’s a vital realm of science as an overall study, and we’ll be looking at it in this quiz.

• 1.
One possible unit of speed is
• A.

Miles per hour.

• B.

Light years per century.

• C.

Kilometers per hour.

• D.

All of the above.

• E.

None of the above

• 2.
Acceleration is defined as the CHANGE in
• A.

Time it takes to move from one place to another place

• B.

Velocity of an object.

• C.

Distance divided by the time interval.

• D.

Velocity divided by the time interval.

• E.

.time it takes to move from one speed to another speed.

• 3.
A car starts from rest and after 7 seconds it is moving at 42 m/s. What is the car’s average acceleration?
• A.

0.17 m/s2

• B.

1.67 m/s2

• C.

6 m/s2

• D.

7 m/s2

• E.

None of the above

• 4.
In the absence of air resistance, objects fall at constant
• A.

Speed.

• B.

Velocity.

• C.

Acceleration.

• D.

Distances each successive second.

• E.

All of the above

• 5.
Suppose an object is in free fall. Each second the object falls
• A.

The same distance as in the second before.

• B.

A larger distance than in the second before.

• C.

With the same instantaneous speed.

• D.

With the same average speed.

• E.

None of the above

• 6.
Consider drops of water leaking from a water faucet. As the drops fall they
• A.

Remain at a relatively fixed distance from each other.

• B.

Get farther apart.

• C.

Get closer together.

• 7.
When a basketball player jumps to make a shot, once the feet are off the floor, the jumper's acceleration
• A.

Varies with body orientation

• B.

Depends on launch speed.

• C.

Is usually greater for taller players (but not always).

• D.

Depends on all the above.

• E.

Is g; no more, no less.

• 8.
Suppose a car is moving in a straight line and steadily increases its speed. It moves from 35 km/h to 40 km/h the first second and from 40 km/h to 45 km/h the next second. What is the car's acceleration?
• A.

5 km/h•s

• B.

10 km/h•s

• C.

35 km/h•s

• D.

40 km/h•s

• E.

45 km/h•s

• 9.
A ball is thrown straight up. At the top of its path its instantaneous speed is
• A.

0 m/s.

• B.

• C.

• D.

• E.

• 10.
When something falls to the ground, it accelerates. This acceleration is called the acceleration due to gravity and is symbolized by the letter g. What is the value of g on Earth's surface?
• A.

0 m/s2

• B.

• C.

• D.

• E.

• 11.
If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by
• A.

• B.

• C.

• D.

A variable amount.

• E.

A rate that depends on its initial speed.

• 12.
A freely falling object starts from rest. After falling for 6 seconds, it will have a speed of about
• A.

6 m/s.

• B.

30 m/s.

• C.

60 m/s.

• D.

300 m/s.

• E.

More than 300 m/s.

• 13.
A pencil lies on your desk. If the Earth is moving around the sun at a speed of 30 km/s, how fast is the pencil moving relative to the desk? How fast is the pencil moving relative to the sun?
• A.

0 km/s; 0 km/s

• B.

0 km/s; 30 km/s

• C.

30 km/s; 30 km/s

• D.

There is not enough information to answer these questions.

• 14.
A 15-N force and a 45-N force act on an object in opposite directions. What is the net force on the object?
• A.

15 N

• B.

30 N

• C.

45 N

• D.

60 N

• E.

None of the above

• 15.
Equilibrium occurs when
• A.

All the forces acting on an object are balanced.

• B.

The sum of the +x forces on an object equals the sum of the –x forces.

• C.

The net force on the object is zero.

• D.

The sum of the upward forces equals the sum of the downward forces.

• E.

All of the above

• 16.
The weight of a person can be represented by a vector that acts
• A.

In a direction that depends on where the person is standing.

• B.

Perpendicular to the ground underneath the person.

• C.

Parallel to the ground.

• D.

Straight down, even if the person is standing on a hill.

• E.

All of the above

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