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Relative Motion

Authored by Shucha Zhang

Physics

7th - 10th Grade

Used 13+ times

Relative Motion
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14 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Observers using different ___________________ may measure different velocities for an object in motion

frame of reference

relatives of motion

projectile motions

constant velocity

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

What is the relative speed of the guy walking on the belt to the girl standing still on the walkway.

0 m/s

2 m/s

4 m/s

1 m/s

Answer explanation

Media Image

The belt is moving at a rate of 2 m/s. The guys is walking on the belt moving at 2 m/s ON TOP OF the already moving 2 m/s. So these two speeds add together. 2+2 = 4 m/s

3.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A boat heading north crosses a wide river with a velocity of 10.00 km/h relative to the water. The river has a uniform velocity of 5.00 km/h due east. What formula would you used to Determine the boat’s speed with respect to an observer on shore.

subtraction (10-5)

addition (10+5)

division (10/5)

Pythagorean Theorem (A2 + B2 = C2)

Multiplication (10*5)

Answer explanation

Media Image

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Increasing the River Speed _____________ the time required for the boat to cross the river.

increases

decreases

doesn't change

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

What is the relative velocity of the rabbit to the boat people?

(Reference West as negative, and East as Positive). W-E

10 m/s West

10 m/s East

0 m/s

-10 m/s

Answer explanation

The boat people are approaching the bunny at 10 m/s west. That means that the bunny looks like it is approaching them from left to right at 10 m/s.

6.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

A boat heading north crosses a wide river with a velocity of 10.00 km/h relative to the water. The river has a uniform velocity of 5.00 km/h due east. Determine the boat’s speed with respect to an observer on shore.

11.18 km/hr

15 km/hr

5 km/hr

30 km/hr

Answer explanation

Media Image

Use the Pythag. Theorem to solve for the velocity. the numbers in the example are NOT from the problem above.

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Q What is the correct formula for relative velocity of a body A with respect to B?

(a) vR = vB - vA

vR = vA - vB

vR = vB + vA

vR = vB x vA

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