# Two-dimensional Kinematics

10 Questions | Total Attempts: 2417  Settings  You may take this quiz up to 3 times. The quiz is open through Sunday, September 11th. (Some questions are review questions, some are new!)

• 1.
Change in position is called ____________.
• A.

Velocity

• B.

Displacement

• C.

Rate

• 2.
The change of velocity over time is called ___________.
• A.

Acceleration

• B.

Speed

• C.

Distance

• 3.
An object in free-fall is undergoing __________ acceleration.
• A.

Constant

• B.

Average

• C.

Instantaneous

• 4.
The acceleration due to gravity at or near the earth's surface is ______ m/s2.
• A.

3.5

• B.

27

• C.

9.8

• 5.
Displacement in 2-dimensions is a ___________, because you must know both magnitude and direction.
• A.

Scalar

• B.

Vector

• C.

Number

• D.

Straight line

• 6.
A vector in 2-dimensions can be broken down into horizontal and vertical ___________ vectors.
• A.

Component

• B.

Scalar

• C.

Uneven

• D.

Equivalent

• 7.
What is the vertical component of velocity of an object moving at 5 m/s at an angle of 30 degrees above the ground?
• A.

5 sin 30 m/s

• B.

5 cos 30 m/s

• C.

30 cos 5 m/s

• D.

30 sin 5 m/s

• 8.
If we ignore air resistance, we usually say that the horizontal component of acceleration of a projectile is ___________.
• A.

Variable

• B.

Equal to the vertical component of acceleration

• C.

Constant

• D.

0

• 9.
If we ignore air resistance, the vertical component of acceleration of a projectile is _________________.
• A.

-9.8 m/s^2

• B.

0

• C.

Variable

• D.

Constantly increasing

• 10.
If your initial velocity does not change, which launch angle will result in the greatest horizontal displacement of a projectile?
• A.

0 degrees

• B.

30 degrees

• C.

45 degrees

• D.

90 degrees (straight up)

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