Distance, Motion, and Forces

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

• it is in motion.
   
• it is speeding
• it has a high velocity
• it is accelerating

Speed equals distance divided by

• time
• velocity
• size
• motion

You can show the motion of an object on a line graph in which you plot distance against

• velocity
• time
• speed 
• direction

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 steepness of a line on a graph is called the

• rise
• run
• slope
• vertical axis

Average speed is

• equivalent to velocity.
• the rate at which an object is moving at a given instant.
• the rate at which a slope changes.
• the total distance traveled divided by the total time.

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

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

On a graph showing distance versus time, a horizontal line represents an object that is

• moving at a constant speed.
• increasing its speed.
• decreasing its speed.
• not moving at all.

If you know the distance an object has traveled in a certain amount of time, you can determine

• the size of the object.
• the speed of the object.
• the location of the object.
• the acceleration of the object.

If a bicyclist travels 40 kilometers in two hours, her average speed is

• 30 km/h.
• 15 km/h.
• 20 km/h.
• 2 km/h.