4. 2D Kinematics

Intro to Relative Velocity

4. 2D Kinematics

# Intro to Relative Velocity - Video Tutorials & Practice Problems

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concept

## Intro to Relative Motion (Relative Velocity)

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2

concept

## Solving Relative Velocity Problems in 1D

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3

Problem

ProblemA boat on a river is traveling from a pier to a point 500 m upstream (against the river's current)**.** The current flows at 4 m/s**.** If the boat makes the trip in 250 s, what is the speed of the boat relative to the water?

A

2 m/s

B

0 m/s

C

6 m/s

D

12 m/s

4

example

## Flying in the Wind

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PRACTICE PROBLEMS AND ACTIVITIES (23)

- A railroad flatcar is traveling to the right at a speed of 13.0 m/s relative to an observer standing on the gr...
- Two piers, A and B, are located on a river; B is 1500 m downstream from A (Fig. E3.32). Two friends must make ...
- The nose of an ultralight plane is pointed due south, and its airspeed indicator shows 35 m/s. The plane is in...
- A 'moving sidewalk' in an airport terminal moves at 1.0 m/s and is 35.0 m long. If a woman steps on at one end...
- A 'moving sidewalk' in an airport terminal moves at 1.0 m/s and is 35.0 m long. If a woman steps on at one end...
- A river flows due south with a speed of 2.0 m/s. You steer a motorboat across the river; your velocity relativ...
- A river flows due south with a speed of 2.0 m/s. You steer a motorboat across the river; your velocity relativ...
- A canoe has a velocity of 0.40 m/s southeast relative to the earth. The canoe is on a river that is flowing 0....
- An airplane pilot wishes to fly due west. A wind of 80.0 km/h (about 50 mi/h) is blowing toward the south. (a)...
- The nose of an ultralight plane is pointed due south, and its airspeed indicator shows 35 m/s. The plane is in...
- An airplane pilot wishes to fly due west. A wind of 80.0 km/h (about 50 mi/h) is blowing toward the south. (b)...
- (II) In what direction should the pilot aim the plane in Problem 67 so that it will fly due south?
- (II) A swimmer is capable of swimming 0.60 m/s in still water. (a) If she aims her body directly across a 55-m...
- Susan, driving north at 60 mph, and Trent, driving east at 45 mph, are approaching an intersection. What is Tr...
- A kayaker needs to paddle north across a 100-m-wide harbor. The tide is going out, creating a tidal current th...
- Ships A and B leave port together. For the next two hours, ship A travels at 20 mph in a direction 30° west of...
- While driving north at 25 m/s during a rainstorm you notice that the rain makes an angle of 38° with the verti...
- A child, who is 45 m from the bank of a river, is being carried helplessly downstream by the river's swift cur...
- (II) Two cars approach a street corner at right angles to each other (Fig. 3–57). Car 1 travels at a speed rel...
- (II) Raindrops make an angle θ with the vertical when viewed through a moving train window (Fig. 3–55). If the...
- (II) (a) At what upstream angle must the swimmer in Problem 71 aim, if she is to arrive at a point directly ac...
- (II) An airplane is heading due south at a speed of 688 km/h. If a wind begins blowing from the southwest at a...
- (II) A motorboat whose speed in still water is 4.30 m/s must aim upstream at an angle of 23.5° (with respect t...