Jeff is in a stationary (still; not moving) school bus. Which is the best reference point for him to use to determine when the bus starts to move?

• the front entrance of the school
• the car next to him
• the bus next to him
• a student walking on the sidewalk

Velocity is

• speed and acceleration
• constant speed
• a frame of reference
• speed in a given direction

Speed =

• distance / time
• time / distance
• distance * time

Tags

NGSS.MS-PS3-1

A horizontal line on a distance vs. time graph means the object's speed is

• increasing
• decreasing
• zero

Acceleration is

• increasing speed
• decreasing speed
• changing direction
• all of the above

Tags

NGSS.MS-PS2-2

A ceiling fan rotating in a circle at a constant speed of 1 m/s is accelerating. True or False?

• True
• False

A car driving 100 miles per hour hits the brakes and slows to 50 miles per hour. This is an example of negative acceleration. True or False?

• True
• False

A student jogging at 2 m/s picks up the pace until she is jogging at 4 m/s. This is an example of acceleration. True or False?

• True
• False

Change in speed over a given period of time is

• velocity
• motion
• speed
• acceleration

Does the speedometer of a car read average speed or instantaneous speed?

• average speed
• instantaneous speed