Physics 1230 Test 1 Fall 2023

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Questions and Answers

When did the car change direction based on the provided information?

At 2.5 s

Only at 1 s

At no point

At both 1 s and 4 s (correct)

Which of the following options describes where the car might have changed direction?

Between 2.5 s and 5 s (correct)

Between 0 s and 1 s

Between 5 s and 6 s

Between 1 s and 2.5 s

Which component label indicates a negative value for the average velocity?

Both components in option (e) (correct)

vav,y in option (d)

vav,y in option (b)

vav,x in option (a)

In which scenario did Felipe and Samara move in the same direction according to the options provided?

At both points #3 and #4 Signup and view all the answers

Which label indicates both velocity components are zero?

Option (c) Signup and view all the answers

Which of the following motion diagrams shows a car accelerating while moving in the positive direction?

Diagram (b) Signup and view all the answers

What does the negative sign in vav,x or vav,y represent?

Motion in the negative direction Signup and view all the answers

At which points were Felipe and Samara identified to have conflicting directions?

At points #3 and #4 Signup and view all the answers

In a position-versus-time graph, how is negative velocity represented?

The graph slopes downwards Signup and view all the answers

If the velocity of a car is constant, what can be inferred about the acceleration?

Acceleration is zero Signup and view all the answers

Which option correctly describes both components as positive?

Option (a) Signup and view all the answers

During which segment of the velocity-versus-time graph does the car experience uniform motion?

From 2.5 to 5 seconds Signup and view all the answers

What conclusion can be drawn if the velocity graph shows a negative slope?

The object is slowing down Signup and view all the answers

Which of the following best describes the motion of the car if the velocity graph shows a horizontal line?

The car is moving at a constant speed Signup and view all the answers

If a car changed direction at 2.5 seconds on the velocity graph, what would this imply?

The velocity crossed zero at that instant Signup and view all the answers

Which type of graph best illustrates the relationship between position and time in uniformly accelerated motion?

A parabolic curve Signup and view all the answers

What is the train's velocity at 5 seconds based on the provided graph?

v = +16 m/s Signup and view all the answers

What is the minimum constant deceleration required for the airplane to stop on a 2500-meter runway, assuming it lands at 140 m/s?

a = −35.7 m/s² Signup and view all the answers

Which of the following best describes the relationship between position and time in the graph provided for the train at 5 seconds?

The graph indicates a constant speed. Signup and view all the answers

What would happen to the airplane's stopping distance if the deceleration was reduced?

The stopping distance would increase. Signup and view all the answers

In the context of the car's curved trajectory, what does the displacement vector represent?

The difference between the initial and final position vectors. Signup and view all the answers

What factor contributes most significantly to the average velocity being less than the constant speed of the cat in its path from A to B?

Change in direction Signup and view all the answers

If the train were to continue moving at the same velocity after 5 seconds, how would its position be determined?

By using the initial position and adding the velocity multiplied by time. Signup and view all the answers

Study Notes

Test Instructions

Test consists of 10 questions.
First 8 questions are multiple choice (10 points each).
Questions 9 and 10 require written responses (total of 20 points).
Use provided equation sheet; no other notes allowed.
Incorrect multiple-choice answers receive zero points; partial credit for written responses is awarded based on work shown and correctness.

Motion Diagrams

Determine motion based on given velocity and acceleration values with standard sign conventions.
Identify correct position-versus-time graphs for provided motion diagrams.

Velocity and Time

Analyze velocity-versus-time graphs to assess changes in direction.
Recognize the time intervals when a car may change direction based on velocity readings.

Average Velocity Components

Analyze vectors using standard conventions to label average velocity components as positive, negative, or zero.

Direction of Motion

Identify points where two individuals (Felipe and Samara) are moving in the same direction.
Understand relationships between trajectories and directions at specific points.

Velocity from Position-Time Graphs

Interpret position versus time graphs to calculate instantaneous velocity at a given time.

Deceleration Calculations

For an airplane landing on a 2500-meter runway at 140 m/s, determine the minimum constant deceleration needed to stop safely.
Use applicable equations to calculate the required deceleration values.

Average Velocity of a Walking Cat

For a cat walking from point A to B at a constant speed of 7 m/s, find the magnitude of its average velocity based on its trajectory.

Vector Representation

For questions involving vectors, sketch and label the initial position vector, final position vector, and the displacement vector in a given coordinate system. Ensure arrowheads are clearly visible for each vector.

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Description

Prepare for your Physics 1230 Test 1 with this quiz designed for Fall 2023. Answer the questions based on your understanding of the material covered in class, using your equation sheet as needed. Make sure to check your answers before submitting your exam in full for evaluation.