Frame of Reference

A place or object used for comparison to determine if another object is in motion is called a

• comparison point
• reference point
• point of view
• motion detector

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

If a truck passes you going 90 km/hr north while you are driving 80 km/hr north, what is the truck's velocity relative to your car

• 170 km/hr N

• 170 km/hr S

• 10 km/hr S

• 10 km/hr N

A spy runs from the front to the back of a ship at a speed of 3.0 m/s. If the ship is moving forward at 18.0 m/s, how fast does the spy appear to

be running when viewed by someone watching from the shore?

• 14.5 km/hr

• 15.0 m/s

• 21.0 m/s

• 63 m/s

The best reference points are stationary (not moving).

• true

• false

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

What is the velocity of the hot air balloon in reference 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

A baseball pitcher is warming up as he travels to a game by plane. The plane is flying at 250 m/s North relative to the ground. The pitcher throws the ball at 50 m/s South relative to the airplane. What is the ball’s velocity relative to the ground?

• 200 m/s South

• 200 m/s North

• 250 m/s South

• 250 m/s North

What is the velocity of the runner in reference to the hitch hiker standing still?

• 4 m/s left

• 4 m/s right

• 30 m/s left

• 2 m/s left

What is the velocity of the hot air balloon in reference to the car?

• 27 m/s left

• 27 m/s right

• 33 m/s right

• 33 m/s left