Velocity and Acceleration

1. Which of the following statements about speed and velocity is correct?

• Velocity only describes an object’s rate of motion.
• Speed describes how an object is changing its velocity.
• Speed and velocity both describe how an object is speeding up.
• Only velocity includes the direction an object is traveling.

Acceleration describes how an object’s velocity is changing.  Which of the following scenarios provides the best example of an accelerating object?

• A car driving at a constant speed
• A book sitting on top of a high shelf
• A toy train traveling in a circle
• A toy boat floating in a bathtub

What is the formula to calculate speed?

• S = t/d
• S = d/t
• S = d x t
• S = t x d

Tags

CCSS.6.EE.B.7

Sharis decides to be brave and go skydiving. If she accelerates at 9.81 m/s² (m/s² = m/s/s) for 4.9 s, what would her speed be at that time?

• 48.1 m/s

• 0.6 m/s

• 0.0015 m/s

• 7.1 m/s

Tags

NGSS.HS-PS2-1

Select the description of motion from A - B.

• Slowing down away from the origin

• Speeding up away from the origin

• Constant velocity away from the origin

• Constant velocity towards the origin

Tags

NGSS.HS-PS2-1

Part A of the graph is from 0s to 25s. Which of these statements is true about Part A?

• The object is at rest.

• The object is accelerating (its velocity is increasing)

• The object is decelerating (its velocity is decreasing)

• The object is moving at a constant velocity.

Tags

NGSS.HS-PS2-1

Part C of the graph is from 35s to 55s. Which of these statements is true about Part C?

• The object is at rest.

• The object is accelerating (its velocity is increasing)

• The object is decelerating (its velocity is decreasing)

• The object is moving at a constant velocity.

Tags

NGSS.HS-PS2-1

What does a flat (horizontal) line on a velocity-time graph mean?

[Example section B on this graph]

• The object is not moving.

• The object is moving, but at a constant velocity.

• The object is accelerating, and its acceleration is positive.

• The object is accelerating, and its acceleration is negative.

What does a line with a positive slope mean on a velocity-time graph?

[Example sections A, E on this graph]

• The object is not moving.

• The object is moving, but at a constant velocity.

• The object is accelerating, and its acceleration is positive.

• The object is accelerating, and its acceleration is negative.

What does a line with a negative slope mean on a velocity-time graph?

[Example sections C, D on this graph]

• The object is not moving.

• The object is moving, but at a constant velocity.

• The object is accelerating, and its acceleration is positive.

• The object is accelerating, and its acceleration is negative.