8th_Assessment

An object’s position

• • describes an objects 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

Differentiating between positive and negative numbers can indicate

• • the distance between two or more objects.

• • the direction 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 used 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

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 while velocity describes an objects distance and direction.

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

Average velocity is calculated by dividing the _____________ by the time needed to travel __________.

• • speed; a certain distance

• • distance traveled; that distance

• • difference in speed; that direction

• • starting position; to the end position

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.