Question 1

A position–time graph of a person walking steadily away from a motion sensor is a straight line with a positive slope. What does the slope of this line represent?

Accepted Answer

The velocity of the person

Question 2

If a velocity–time graph is a horizontal line below the time axis, what does this indicate about the motion of the object?

Accepted Answer

The object is moving with a constant negative velocity

Question 3

Given the following velocity values measured at equal time intervals: $$2, 6, 3, 8, 10 m/s$$, what is the average velocity?

Accepted Answer

$$5.8 m/s$$

Question 4

A position–time graph is a curve that gets steeper as time increases. What does this indicate about the object's motion?

Accepted Answer

The object is accelerating

Question 5

Which of the following best describes the difference between a vector and a scalar quantity?

Accepted Answer

A scalar has magnitude only, while a vector has both magnitude and direction

Question 6

Three forces of $$10\ \mathrm{N}$$ each act at a point at angles $$0^\circ$$, $$60^\circ$$, and $$120^\circ. $$What is the sum of all the x-components $$\Sigma F_x of $$the three forces?

Accepted Answer

$$0\ \mathrm{N}$$

Question 7

A cart is pushed with a constant force along a frictionless track. Which of the following best describes the acceleration–time graph for this motion?

Accepted Answer

A horizontal line above zero

Question 8

If the velocity–time graph of an object is a straight line with a positive slope, what can you say about the object's acceleration?

Accepted Answer

The object has constant positive acceleration

Question 9

A student walks away from a motion detector slowly and steadily, then stands still for 5 seconds, and finally walks toward the detector at twice the original speed. Which of the following best describes the velocity–time graph for this motion?

Accepted Answer

A positive constant value, then zero, then a negative constant value with greater magnitude

Question 10

Which equation correctly relates position, initial velocity, acceleration, and time for uniformly accelerated motion?

Accepted Answer

$$x = x_0$ + v_0$ t + \frac{1}{2} a t^2$

Question 11

If an object moves with constant velocity, what is the shape of its position–time graph?

Accepted Answer

A straight line

Question 12

During an experiment, you find that the average velocity calculated from the position–time graph is different from the average velocity calculated from the velocity–time graph. Which of the following is the most likely explanation?

Accepted Answer

There was experimental error or measurement uncertainty

Question 13

A position–time graph is a horizontal line. What does this indicate about the motion of the object?

Accepted Answer

The object is at rest

Question 14

Which of the following statements about acceleration is correct?

Accepted Answer

Acceleration is the rate of change of velocity with respect to time

Question 15

If the acceleration–time graph of an object is a horizontal line at zero, what does this indicate about the object's motion?

Accepted Answer

The object is moving at constant velocity

Question 16

A car starts from rest and accelerates uniformly at $$2\ \mathrm{m/s^2$}$$ for $$5$$ seconds. What is its final velocity?

Accepted Answer

$$10\ \mathrm{m/s}$$

Question 17

Which of the following best describes the resultant of three forces of equal magnitude $$F$$ acting at $$0^\circ$$, $$120^\circ$$, and $$240^\circ$$?

Accepted Answer

The resultant is $$0$$

Question 18

A student walks toward a motion detector at a constant speed. Which of the following best describes the velocity–time graph?

Accepted Answer

A horizontal line below the time axis

Question 19

Which of the following is a correct unit for acceleration?

Accepted Answer

$$\mathrm{m/s^2$}$$

Question 20

If an object starts from rest and moves with a constant acceleration $$a$$, which equation gives the distance traveled after time $$t$$?

Accepted Answer

$$x = \frac{1}{2} a t^2$

Introduction to Motion and Vectors: Structured Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard