Speed, Acceleration

When an object’s distance from another object is changing,

• it is in motion.
• it is speeding. 
• it is accelerating.
• it is moving at a high velocity.

Speed equals distance divided by

• time
• velocity
• size
• motion

When you know both the speed and direction of an object's motion, you know the

• average speed of the object
• acceleration of the object
• distance the object has traveled
• velocity of the object

The rate at which velocity changes is called

• speed
• direction
• acceleration
• motion

Which of these is an example of negative acceleration (or deceleration)?

• a bird taking off for flight
• a baseball released by a pitcher
• a car approaching a red light
• an airplane following a straight flight path

A train that travels 100 kilometers in 4 hours is traveling at what average speed?

• 50 km/h
• 100 km/h
• 2 km/h
• 25 km/h

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

• a position
• a reference point
• a constant
• velocity

If the speed of an object does not change, the object is traveling at

• constant speed
• average speed
• increasing speed
• decreasing speed

Changing direction is an example of a kind of 

• acceleration
• speed
• velocity
• constant rate

If a bicyclist travels 30 km in 2 hours, her average speed is

• 30 km/h
• 60 km/h
• 15 km/h
• 2 km/h