All the Relative Motion

The president’s airplane, Air Force One, flies at 250 m/s to the east with respect to the air. The air is moving at 35 m/s to the north with respect to the ground. Find the velocity of Air Force One with respect to the ground.

• 252 m/s
• 222 m/s
• 435 m/s
• 125 m/s

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A motorboat, which has a speed of 5 m/s in still water, is crossing a river (from west to east) The river's current is flowing south at 3.3 m/s. What is the magnitude of the boat’s resultant velocity with respect to the starting point?

• 3.3 m/s

• 5.0 m/s

• 6.0 m/s

• 8.3 m/s

A hiker walks 5 kilometers due north and then 7 kilometers due east. What is the hiker's resultant displacement?

• 2 km
• 8.6 km
• 12 km
• 12.6 km

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

Tags

CCSS.HSN.VM.A.1

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

• frame of reference

• relatives of motion

• projectile motions

• constant velocity

If a car passes you in the left lane going 90 km/hr north while you are driving 80 km/hr north, how fast is the car moving relative to your car?

• 170 km/hr

• 90 km/hr

• 80 km/hr

• 10 km/hr

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

A passenger at the rear of a train traveling at 15 m/s relative to the ground throws a baseball with a speed of 15 m/s in the direction opposite the motion of the train. What is the velocity of the baseball relative to the ground as it leaves the thrower’s hand? In other words: how fast does a person on the ground see the ball move?

• 30 m/s

• 15 m/s

• 0 m/s

• 20 m/s

A woman on a 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 train's speed with respect to the stationary observer?

• 40 mph

• 50 mph

• 10 mph

• 30 mph

Tags

NGSS.MS-PS3-1