Frame of Reference and Motion

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

If a car passes you 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 N

• 170 km/hr S

• 10 km/hr S

• 10 km/hr N

The best reference points are stationary (not moving).

• true

• false

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

The SI (metric) unit for length or distance is

• foot (ft)

• inch (in)

• mile (mi)

• meter (m)

The speedometer on your car tells you

• compass direction

• density

• average speed

• instantaneous speed

Tags

NGSS.MS-PS3-1

The SI Metric) unit for time is

• second (s)

• minute (min)

• hour (hr)

• year (yr)

A distance vs. time graph shows an object's

• frame of reference
• speed
• acceleration
• favorite food

Tags

NGSS.MS-PS3-1

A quantity that is fixed, or unchanging is called

• constant

• variable

• initial velocity

• scalar

Tags

NGSS.MS-PS1-5

How do you calculate average speed?

• divide total time by total distance
• multiply total time by total distance
• divide total distance by total time
• subtract total time from total distance