Dynamics Physics

In the velocity-time graph shown above, the positive direction is up.

Is the acceleration after point A…

• Positive

• Negative

• Zero

Tags

NGSS.HS-PS2-1

The above graph shows velocity as a function of time for an object moving along a straight line. During which time interval is the object moving in the negative direction, and what about the graph indicates this

• From 0 to 2 seconds, shown by the negative slope of the line

• From 1 to 2 seconds, shown by the negative slope of the line, paired with negative values on the y-axis.

• From 1 to 4 seconds, shown by the negative values on the y-axis

• From 1 to 4 seconds, shown by the negative values on the x-axis

The graph above shows velocity as a function of time for an object moving along a straight line.

Which graph below correctly shows acceleration as a function of time for the same object during the same time interval?

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• 
• 

Tags

NGSS.HS-PS2-1

The graph above shows velocity as a function of time for an object moving along a straight line.

Which graph below correctly shows position as a function of time for the same object during the same time interval?

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• 
• 

The above graph shows velocity as a function of time for an object moving along a straight line. Which one of the following best describes the object’s motion during the time interval from 2 to 3 seconds?

• Speeding up while moving in the positive direction.

• Speeding up while moving in the negative direction

• Slowing down while moving in the positive direction

• Slowing down while moving in the negative direction

Let us define East as the positive direction. For the following question, determine the signs of acceleration and velocity for a car moving west while slowing down

• acceleration negative

  velocity negative

• acceleration negative

  velocity positive

• acceleration positive

  velocity negative

• acceleration positive

  velocity positive

Tags

NGSS.HS-PS2-1

Refer to the velocity-time graph above. The positive direction is up. During what time interval(s) was the object moving downward?

• 15-40 min

• 30-40 min

• 0-10 min and 40-55 min

• 0-30 min

• 30-55 min

Refer to the velocity-time graph above. The positive direction is up. During what time interval(s) was the object slowing down?

• 30-40 min

• 30-55 min

• 15-40 min

• 15-30 min and 40-55 min

• 15-30 min

At time t = 0, car X traveling with speed v0 passes car Y which is just starting to move. Both cars then travel on two parallel lanes of the same straight road. The graphs of speed v versus time t for both cars are shown below

Which of the following is true at time t = 20 seconds?

• Car Y is behind car X.

• Car Y is passing car X.

• Car Y is in front of car X

• Car X is accelerating faster than car Y.

At time t = 0, car X traveling with speed v0 passes car Y which is just starting to move. Both cars then travel on two parallel lanes of the same straight road. The graphs of speed v versus time t for both cars are shown below

From time t = 0 to time t = 40 seconds, the areas under both curves are equal. Therefore, which of the following is true at time t = 40 seconds?

• Car Y is behind car X.

• Car Y is passing car X.

• Car Y is in front of car X

• Car X is accelerating faster than car Y.

Tags

NGSS.HS-PS2-1