Speed and Acceleration

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

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

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

The moon accelerates because it is

• in a vacuum in space.
• continuously changing direction.
• a very large sphere.
• constantly increasing its speed of orbit.

If you know a car traveled 300 km in 3 hours, you can find its

• acceleration.
• direction.
• average speed.
• velocity.

If a train traveling at 30 m/s brakes to a stop in 1 minute, its acceleration is _________.

• 30 m/s²
• 0.5 m/s²
• -0.5 m/s²
• -30 m/s²