Velocity

What is the walker's speed from the observer's perspective?

• 30 mph right

• 50 mph right

• 50 mph left

• 30 mph left

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-PS3-1

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

• frame of reference

• relatives of motion

• projectile motions

• constant velocity

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

How fast does the hot air balloon appear to be moving to the person in the canoe?

• m/s to the left

• m/s to the right

• 5 m/s to the left

• 5 m/s to the right

The stationary observer starts walking 10 mph to the right. What is the walker on the train's speed with respect to the now moving observer outside of the train?

• 0 mph

• 10 mph right

• 40 mph left

• 40 mph right

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

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

How fast an object is traveling in a certain direction is the definition of __________.

• speed

• velocity

• acceleration

• position

Tags

NGSS.MS-PS3-1

A high speed power tool known as a floor burnisher is used to give floors a nice luster (soft glow). This tool contains an abrasive pad that rotates at 2000 rpm clockwise, which is an example of a ___________.

• distance

• acceleration

• speed

• velocity

Which section shows an object getting faster?

• A only

• B only

• A and C

• D

• C and D

Tags

NGSS.MS-PS3-1