Velocity-Time Graph

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 B of the graph is from 25s to 35s. Which of these statements is true about Part B?

• 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

Part D of the graph is from 55s to 95s. During Part D, the velocity values are all negative. What does negative velocity mean?

• The object is slowing down.

• The object is moving in the opposite direction now.

Part E of the graph is from 95s to 105s. Which of these statements is true about Part E?

• The object's velocity values are negative.

• The object's velocity values are positive.

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.

You can calculate the slope of a velocity-time graph.

If you calculate the slope of the graph between two points, what would that tell you?

• The velocity of the object.

• The distance travelled by the object.

• The acceleration of the object.

• The mass of the object

During section A of the graph (between 0s and 25s), the object is accelerating.

Change in velocity in this time = 3 - 0 = 3m/s

Time taken = 25 - 0 = 25s

What is its acceleration?

• Acceleration = Change in velocity x time = 3 x 25 = 75m/s²

• Acceleration = Change in velocity / time = 3/25 = 0.12m/s²

Tags

NGSS.HS-PS2-1