Question 1

Which of the following best describes the motion of the car in the first image (film strip with car and tree)?

Accepted Answer

The car is accelerating.

Question 2

In the second image, the car's positions are shown at equal time intervals. What does this indicate about the car's motion?

Accepted Answer

The car is moving at a constant speed.

Question 3

In the third image (skateboarder), what type of motion is being depicted?

Accepted Answer

Uniform motion with constant speed.

Question 4

In the fourth image (sprinter), what is happening to the sprinter's speed?

Accepted Answer

The sprinter is speeding up.

Question 5

In the fifth image (red car), what can you infer about the car's motion?

Accepted Answer

The car is slowing down.

Question 6

Which of the following statements about the particle model is correct?

Accepted Answer

It treats the object as if all its mass is concentrated at a single point.

Question 7

Given the position vector $$\vec{r}_1$$ and $$\vec{r}_2$$, what is the formula for displacement $$\Delta \vec{r}$$?

Accepted Answer

$$\Delta \vec{r} = \vec{r}_2 - \vec{r}_1$$

Question 8

A ball is thrown straight up and caught at the same point. If the ball travels a total distance of 10 m, what is its displacement?

Accepted Answer

0 m

Question 9

Which of the following is a vector quantity?

Accepted Answer

Displacement

Question 10

If a car moves from position $$x_1 = 10$ m to x_2$ = -5 m in 3 $$seconds, what is its average velocity?

Accepted Answer

$$\frac{-5 - 10}{3} = -5 m/s$$

Question 11

Which of the following best describes the tip-to-tail method for vector addition?

Accepted Answer

Placing the tail of the second vector at the tip of the first vector.

Question 12

A cyclist riding at 20 mph comes to a stop in 4 s, then accelerates to 15 mph in 6 s. Which of the following best describes the motion diagram?

Accepted Answer

Dots get closer together, then farther apart.

Question 13

What is the average acceleration $$\vec{a}_{avg} if $$the velocity changes from $$\vec{v}_1 to$$ $$\vec{v}_2 in $$time $$\Delta t$$?

Accepted Answer

$$\vec{a}_{avg} = \frac{\vec{v}_2 - \vec{v}_1}{\Delta t}$$

Question 14

If the velocity and acceleration vectors point in the same direction, what happens to the object's speed?

Accepted Answer

The object speeds up.

Question 15

Which of the following is true about the displacement vector?

Accepted Answer

It depends only on the initial and final positions.

Question 16

A student walks 50 m east, then 100 m north. What is the magnitude of her displacement?

Accepted Answer

$$\sqrt{50^2$ + 100^2$} = 111.8 m$$

Question 17

Which of the following statements about vectors is correct?

Accepted Answer

Vectors have both magnitude and direction.

Question 18

A position-versus-time graph shows a straight line with a positive slope. What does this indicate about the object's motion?

Accepted Answer

The object is moving at a constant speed in the positive direction.

Question 19

If an object moves in a straight line and its position-versus-time graph is a horizontal line, what can you conclude?

Accepted Answer

The object is at rest.

Question 20

A rocket launches vertically upward. Which of the following best describes its motion diagram?

Accepted Answer

Dots get farther apart as the rocket speeds up.

Concepts of Motion and Kinematics: Structured Study Notes

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