Motion

Which of these BEST describes acceleration?

• the sum of all the forces on an object

• the rate of change in the velocity of an object

• the increase in distance between two objects

• the rate of change in the position of an object

Which unit would be BEST when measuring the acceleration of a falling object?

• kilograms

• miles per hour

• grams per milliter

• meters per second per second

How does an object's speed differ from its velocity?

• Velocity can change, but speed is always constant.

• Velocity is a measure of the change in an object's speed.

• An object's velocity includes a direction, while speed does not.

• Speed must be measured in miles per hour, while velocity is measured in meters per second.

Speed can be found my calculating...

• acceleration/velocity
• friction/gravity
• momentum/time
• distance/time

When an object is getting faster, it is called....

• potential energy
• kinetic energy
• acceleration
• deceleration 

A car takes 3 hours to travel180 miles at a constant speed.  How fast is the car traveling?

• 30 mph
• 50 mph
• 60 mph
• 90 mph

Mary runs 1500 meters around the school track.  What does she need to know in order to find out her speed?

• her time from start to finish
• the number of steps she took
• her heart rate at the finish line
• the direction she began running

Velocity is-

• Tells us the objects speed and direction

• How far the object travels, regardless of direction

• Difference between starting and ending points

An object is _____ if its position changes relative to another object.

• in motion
• at reset
• a frame of refence
• magical

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