The three activities in this Concept Builder are summarized as follows:

**Describing Free Fall**: Question Groups 1-6**Speedometer**: Question Groups 7-12**It's About Time**: Question Groups 13-18

The questions and graphs used in this Concept Builder are shown below. Teachers are encouraged to view the questions in order to judge which activity is most appropriate for their classes. For instance, teachers of honors classes may find that all questions are appropriate. On the other hand, teachers of lower level or middle school classes may find that the Know Your D, V, P, and T activity is a bit too difficult for the bulk of their students.

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Which of the dot diagrams best describe the motion of a free-falling object that is dropped from rest?

Diagram A

Diagram B

Diagram C

Which of the dot diagrams best describe the motion of a free-falling object that is dropped from rest?

Diagram A

Diagram B

Diagram C

Which of the dot diagrams best describe the motion of a free-falling object that is dropped from rest?

Diagram A

Diagram B

Diagram C

A paint brush is dropped from the top of a tall ladder and free falls to the ground. What changes, if any, would be observed of the velocity and the acceleration of the brush as it falls? Pick the two answers.

The velocity increases.

The velocity decreases.

The velocity remains a constant value.

The acceleration increases.

The acceleration decreases.

The acceleration remains a constant value.

A textbook is dropped from the second story stairs and free falls to the ground. What changes, if any, would be observed of the velocity and the acceleration of the textbook as it falls? Pick two answers.

The velocity increases.

The velocity decreases.

The velocity remains a constant value.

The acceleration increases.

The acceleration decreases.

The acceleration remains a constant value.

A tennis ball is hit straight upwards and undergoes a free fall motion as it rises towards its highest point. What changes, if any, would be observed of the velocity and the acceleration of the tennis ball as it rises towards its highest point? Pick two answers.

The velocity increases.

The velocity decreases.

The velocity remains a constant value.

The acceleration increases.

The acceleration decreases.

The acceleration remains a constant value.

A baseball is thrown straight upwards from the ground and undergoes a free fall motion as it rises towards its highest point. What changes, if any, would be observed of the velocity and the acceleration of the baseball as it rises towards its highest point? Pick two answers.

The velocity increases.

The velocity decreases.

The velocity remains a constant value.

The acceleration increases.

The acceleration decreases.

The acceleration remains a constant value.

A tennis ball is hit straight upwards and undergoes a free fall motion as it rises towards its highest point and then fall back downward to the ground. What changes, if any, would be observed of the velocity and the acceleration of the tennis ball as it falls downward from its highest point? Pick two answers.

The velocity increases.

The velocity decreases.

The velocity remains a constant value.

The acceleration increases.

The acceleration decreases.

The acceleration remains a constant value.

A baseball is thrown straight upwards from the ground and undergoes a free fall motion as it rises towards its highest point and then fall back downward to the ground. What changes, if any, would be observed of the velocity and the acceleration of the baseball as it falls downward from its highest point? Pick two answers.

The velocity increases.

The velocity decreases.

The velocity remains a constant value.

The acceleration increases.

The acceleration decreases.

The acceleration remains a constant value.

Velocity and acceleration are both vectors; they have a direction. What is the direction of the velocity and acceleration vectors of a tennis ball that is rising upward towards its highest point above the ground? Pick two answers.

The velocity vector is directed upward.

The velocity vector is directed downward.

The acceleration vector is directed upward.

The acceleration vector is directed downward.

Velocity and acceleration are both vectors; they have a direction. What is the direction of the velocity and acceleration vectors of a baseball that is rising upward towards its highest point above the ground? Pick two answers.

The velocity vector is directed upward.

The velocity vector is directed downward.

The acceleration vector is directed upward.

The acceleration vector is directed downward.

Velocity and acceleration are both vectors; they have a direction. What is the direction of the velocity and acceleration vectors of a tennis ball that is falling downward from its highest point towards the ground? Pick two answers.

The velocity vector is directed upward.

The velocity vector is directed downward.

The acceleration vector is directed upward.

The acceleration vector is directed downward.

Velocity and acceleration are both vectors; they have a direction. What is the direction of the velocity and acceleration vectors of a tennis ball that is falling downward from its highest point towards the ground? Pick two answers.

The velocity vector is directed upward.

The velocity vector is directed downward.

The acceleration vector is directed upward.

The acceleration vector is directed downward.

Three different graphics appear repeatedly in Activity 2. They are shown below. The left graphic is associated with all 30 m/s launch speeds. The middle graphic is associated with all 40 m/s launch speeds. And the right graphic is associated with all 50 m/s launch speeds.

A ball is projected upward with an initial speed of approximately 30 m/s. The diagram at the right represents its position at 1-second intervals of time. At what location will the ball have a speed of 0 m/s?

A ball is projected upward with an initial speed of approximately 40 m/s. The diagram at the right represents its position at 1-second intervals of time. At what location will the ball have a speed of 0 m/s?

A ball is projected upward with an initial speed of approximately 50 m/s. The diagram at the right represents its position at 1-second intervals of time. At what location will the ball have a speed of 0 m/s?

A ball is projected upward with an initial speed of approximately 30 m/s. The diagram at the right represents its position at 1-second intervals of time. At what location will the ball be moving upward with a speed of approximately 20 m/s?

A ball is projected upward with an initial speed of approximately 40 m/s. The diagram at the right represents its position at 1-second intervals of time. At what location will the ball be moving upward with a speed of approximately 30 m/s?

A ball is projected upward with an initial speed of approximately 50 m/s. The diagram at the right represents its position at 1-second intervals of time. At what location will the ball be moving upward with a speed of approximately 40 m/s?

A ball is projected upward with an initial speed of approximately 30 m/s. The diagram at the right represents its position at 1-second intervals of time. At what location will the ball be moving downward with a speed of approximately 10 m/s?

A ball is projected upward with an initial speed of approximately 40 m/s. The diagram at the right represents its position at 1-second intervals of time. At what location will the ball be moving downward with a speed of approximately 10 m/s?

A ball is projected upward with an initial speed of approximately 50 m/s. The diagram at the right represents its position at 1-second intervals of time. At what location will the ball be moving downward with a speed of approximately 10 m/s?

A ball is projected upward with an initial speed of approximately 30 m/s. The diagram at the right represents its position at 1-second intervals of time. At what location will the ball be moving downward with a speed of approximately 20 m/s?

A ball is projected upward with an initial speed of approximately 40 m/s. The diagram at the right represents its position at 1-second intervals of time. At what location will the ball be moving downward with a speed of approximately 20 m/s?

A ball is projected upward with an initial speed of approximately 50 m/s. The diagram at the right represents its position at 1-second intervals of time. At what location will the ball be moving downward with a speed of approximately 20 m/s?

A ball is projected upward with an initial speed of approximately 30 m/s. The diagram at the right represents its position at 1-second intervals of time. At what location will the ball be moving downward with a speed of approximately 30 m/s?

A ball is projected upward with an initial speed of approximately 40 m/s. The diagram at the right represents its position at 1-second intervals of time. At what location will the ball be moving downward with a speed of approximately 30 m/s?

A ball is projected upward with an initial speed of approximately 50 m/s. The diagram at the right represents its position at 1-second intervals of time. At what location will the ball be moving downward with a speed of approximately 30 m/s?

A ball is projected upward with an initial speed of approximately 30 m/s. The diagram at the right represents its position at 1-second intervals of time. At what location will the ball be moving upward with a speed of approximately 10 m/s?

A ball is projected upward with an initial speed of approximately 40 m/s. The diagram at the right represents its position at 1-second intervals of time. At what location will the ball be moving upward with a speed of approximately 10 m/s?

A ball is projected upward with an initial speed of approximately 50 m/s. The diagram at the right represents its position at 1-second intervals of time. At what location will the ball be moving upward with a speed of approximately 10 m/s?

A ball is thrown upward with a speed of 30 m/s. Approximately how much time goes it take the ball to travel from the release location (A) to its highest point (B)? Approximately how much total time is the ball in the air before it returns toback to its original height (C)?

A ball is thrown upward with a speed of 40 m/s. Approximately how much time goes it take the ball to travel from the release location (A) to its highest point (B)? Approximately how much total time is the ball in the air before it returns toback to its original height (C)?

A ball is equipped with a speedometer and launched straight upward. The speedometer reading two seconds after launch is shown at the right; the ball is moving upward. At what approximate times would the ball be moving downward and display the following speedometer readings?

A ball is equipped with a speedometer and launched straight upward. The speedometer reading three seconds after launch is shown at the right; the ball is moving upward. At what approximate times would the ball be moving downward and display the following speedometer readings?

A ball is equipped with a speedometer and launched straight upward. The speedometer reading two seconds after launch is shown at the right; the ball is moving upward. At what approximate times would the ball be moving downward and display the following speedometer readings?

A ball is equipped with a speedometer and launched straight upward. The speedometer reading three seconds after launch is shown at the right; the ball is moving upward. At what approximate times would the ball be moving downward and display the following speedometer readings?

A ball is equipped with a speedometer and launched straight upward. The speedometer reading four seconds after launch is shown at the right; the ball is moving downward. At what approximate times would the ball be moving upward and display the following speedometer readings?

A ball is equipped with a speedometer and launched straight upward. The speedometer reading five seconds after launch is shown at the right; the ball is moving downward. At what approximate times would the ball be moving upward and display the following speedometer readings?

A ball is equipped with a speedometer and launched straight upward. The speedometer reading two seconds after launch is shown at the right; the ball is moving upward. At what approximate times would the ball display the following speedometer readings?

A ball is equipped with a speedometer and launched straight upward. The speedometer reading three seconds after launch is shown at the right; the ball is moving upward. At what approximate times would the ball display the following speedometer readings?

A ball is equipped with a speedometer and launched straight upward. The speedometer reading three seconds after launch is shown at the right. At what approximate times would the ball be moving upward and display the following speedometer readings?

A ball is equipped with a speedometer and launched straight upward. The speedometer reading four seconds after launch is shown at the right. At what approximate times would the ball be moving upward and display the following speedometer readings?