Relative Velocity

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

What is the walker's speed with respect to the train?

• 30 mph

• 10 mph

• 40 mph

• 50 mph

Tags

NGSS.MS-PS2-1

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

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

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

A woman on a bicycle travels at 9 m/s S relative to the ground as she passes a little boy on a tricycle going in the opposite direction. If the boy is traveling at 1 m/s N relative to the ground, how fast does the boy appear to be moving relative to the woman?

• 10 m/s S

• 8 m/s N

• 0 m/s

• 10 m/s N

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?

• 1 m/s to the left

• 1 m/s to the right

• 5 m/s to the left

• 5 m/s to the right

In a car, a good frame of reference would be:

• The trees you are driving past in the car

• the tissue box sitting inside your car

• the old lady riding a unicycle beside your car in the same direction and at the same speed