Resultant Velocity and River Crossing

Resultant Velocity and River Crossing

Assessment

Interactive Video

Physics

9th - 10th Grade

Hard

Created by

Patricia Brown

FREE Resource

In this video, Mr. Post explains how to solve a riverboat problem involving a rowboat traveling westward at 2.5 m/s and a current moving southward at 6 m/s. The tutorial covers calculating the resultant velocity using the Pythagorean theorem, determining the angle of the resultant velocity, and finding the time it takes for the boat to cross a 40-meter-wide river. Additionally, it explains how to calculate the distance the boat travels downstream. The video emphasizes understanding vector components and applying trigonometry and physics equations to solve real-world problems.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the initial velocity of the rowboat as it travels westward?

2.5 m/s

3 m/s

6 m/s

4 m/s

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the velocity of the river's current?

4 m/s

6 m/s

3 m/s

2.5 m/s

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How is the resultant velocity of the boat calculated?

By adding the velocities directly

By subtracting the velocities

Using the average of the velocities

Using the Pythagorean theorem

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the angle of the resultant velocity with respect to the westward direction?

90 degrees

247 degrees

180 degrees

67.4 degrees

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the width of the river that the boat needs to cross?

80 meters

60 meters

40 meters

20 meters

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which velocity is used to calculate the time taken to cross the river?

The average velocity

The resultant velocity

The downstream velocity

The westward velocity

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How long does it take for the boat to cross the river?

10 seconds

16 seconds

25 seconds

20 seconds

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