Describing Motion

An object's position

• describes an object's exact location on a map.

• is only used to describe the motion of a car on the road.

• is usually described using centimeters as a unit of length.

• is its current distance and direction from a reference point.

The red car is six car lengths behind the black car. In this scenario, the black car is called a(n)

• lead car.

• imaginary point.

• reference point.

• position point.

When working with distances, positive and negative numbers can indicate

• the distance between two or more objects.

• the direction (forward or backward) an object is heading when describing its position.

• the distance an object has traveled when describing its position.

• the direction an object is traveling regardless of position or distance.

A number line can be useful to describe

• the color of an object.

• how many times an object has moved.

• an object's speed as it changes direction.

• an object's distance from a reference point.

Which of these is an example of rate?

• A car traveling 10 km

• A person eating 5 sandwiches.

• A person running 2 km in 10 minutes.

• Two cars arriving at a location ten minutes apart.

Speed is a rate that describes

• the distance an object moves over time.

• an object’s changes in direction over time.

• the difference in distance between two objects.

• the distance and direction in which an object moves.

Which of the following describes the difference between speed and velocity?

• Speed describes an object’s distance and direction while velocity describes an object’s distance.

• Speed describes an object’s direction while velocity describes an object’s distance and direction.

• Speed describes an object’s distance over time while velocity describes an objects distance over time and direction.

• Speed describes and object’s distance and direction while velocity describes an objects direction.

A reference frame is a

• tool used to describe the relative velocity of a reference point.

• term used to describe a reference point that is not in motion.

• tool used to measure speed and velocity of an object in motion.

• point of view on the speed and direction that objects are moving relative to a reference point.

A reference frame

• can depend on an individual’s point of view.

• can only be established by an object in motion.

• cannot be used to describe multiple objects in motion.

• is always the same no matter the location of the object’s being described.

You are playing catch with a friend when they pass you the ball. From your reference frame

• you move toward the ball.

• your friend moves away from the ball.

• the ball moves toward you and away from your friend.

• your friend moves away from the ball as you move toward it.

Tags

NGSS.MS-PS2-1