In the relative velocity equation, v_B/A  is

• the relative velocity of B with respect to A
• due to the rotational motion
•   ω× r_B/A
• All 

A dog and a cat are about to fight, running towards each other, both at 12 m/s. What are their velocities relative to each other?

• 12 m/s

• 24 m/s

• 0 m/s

• 6 m/s

Tags

NGSS.MS-PS2-1

A train is moving at a velocity of 15 m/s East. A passenger at the back of a train throws a baseball with a speed of 15 m/s West. What is the velocity of the baseball relative to the ground? (In other words: how fast does a person on the ground see the ball move?)

• 30 m/s East

• 15 m/s West

• 0 m/s

• 30 m/s West

Tags

NGSS.MS-PS3-5

Which of the following is the closest match to the definition of motion?

• An objects change in position relative to a reference point
• The change in position of an object
• Constant speed

The Cheerios Nascar is racing around the track at 220 m/s, the Coke A Cola Nascar is speeding at 320 m/s. What is the magnitude of velocity of the Coke A Cola Nascar relative to the Cheerios Nascar?

• 100 m/s

• 320 m/s

• 540 m/s

• 0 m/s

Earth is rotating counter clock-wise (the Sun rises in the East and sets in the West). If you are travelling from Cleveland, Ohio to San Diego, California will your flight be longer on your trip to California or home to Ohio?

• Flight to California

• Flight to Ohio

Tags

NGSS.MS-ESS2-6

Assume that there is a current of 2.0 m/s directed south in the river, and that the ferry’s velocity of 7.0 m/s north is relative to the water. What is the ferry’s velocity relative to the shore? What is your velocity relative to the shore?

• 5.0 m/s N

• 5.0 m/s S

• 9.0 m/s N

• 9.0 m/s S

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

• frame of reference

• relatives of motion

• projectile motions

• constant velocity

How fast does the hot air balloon appear to be moving compared to the runner's frame of reference?

• 1 m/s to the left

• 1 m/s to the right

• 7 m/s to the left

• 7 m/s to the right

Tags

NGSS.MS-PS2-2

Velocity is speed with __________________________.

• a unicycle helmet

• direction

• fight

Tags

NGSS.MS-PS3-1