Quiz: Relative Velocity and Vectors (Regular)

What is speed of the walker in respect to the observer?

• 40 mph

• 50 mph

• 10 mph

• 30 mph

The president’s airplane, Air Force One, flies at 250 m/s to the east (compared to the ground). The president visits the pilots in the cockpit. Then he walks to the back of the plane at 1 m/s. What is his speed relative to the ground?

• 249 m/s

• 251 m/s

• 253 m/s

• 248 m/s

Tags

NGSS.HS-PS2-1

A boat with a speed of 4 m/s will cross a 40 m wide river that has a current of 3 m/s. The boat aims directly across the river. How long will it take the boat to cross the river?

• 10 s

• 20 s

• 30 s

• 40 2

Tags

NGSS.MS-PS2-2

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

• frame of reference

• relatives of motion

• projectile motions

• constant velocity

What is the net force?

• 40 N left
• 0 N Balalnced
• 400 N right
• 40 N right

Tags

NGSS.HS-PS2-1

How fast does the plane appear to be moving to a person riding in the car?

• 520 m/s
• 460 m/s
• 30 m/s
• 490 m/s

Tags

NGSS.HS-PS2-1

A spy runs from the front to the back of an aircraft carrier at a velocity of 3.5 m/s. If the aircraft carrier is moving forward at 18.0 m/s, how fast does the spy appear to

be running when viewed by an observer on a nearby stationary submarine?

• 14.5 km/hr

• 14.5 m/s

• 21.5 m/s

• 63 m/s

A woman on a ten-speed bicycle travels at 9 m/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 relative to the ground, how fast does the boy appear to be moving relative to the woman?

• 9 m/s

• 8 m/s

• 0 m/s

• 10 m/s

What is the net force?
100 N        230 N
<------        --------->

• 30 N to the right
• 230 N to the right
• 130 N to the right
• This is a balanced force

Tags

NGSS.HS-PS2-1

Which statement describes a vector?

• It has magnitude but no direction
• It has direction but no magnitude
• It has both direction and magnitude
• It has constant magnitude but no
   direction