Describing Motion

A pencil’s ____ might be described as 3 centimeters left of the stapler.

• direction

• position

• reference point

• displacement

Why is a car accelerating when it is circling at a constant speed? ?

• It is changing its destination.

• It is changing its direction.

• It is changing its distance.

• It is changing its total mass.

Tags

NGSS.MS-PS2-2

The initial speed of a dropped ball is 0 m/s. After two seconds, the ball travels at a speed of 20 m/s. What is the acceleration of the ball?

• 5 m/s squared

• 10 m/s squared

• 20 m/s squared

• 40 m/s squared

In the phrase “two miles southeast of the mall,” what is the mall?

• a dimension

• a final destination

• a position

• a reference point

If an object is traveling at a constant speed, what is it doing?

• not speeding up or slowing down

• speeding up

• slowing down

• speeding up or slowing down

Radar tells an air traffic controller that a jet is slowing as it nears the airport. Which might represent the jet’s speed?

• 700 h

• 700 h/km

• 700 km

• 700 km/h

Tags

NGSS.MS-PS3-1

What describes motion in which the person or object is accelerating?

• A bird flies straight from a tree to the ground without changing speed.

• A dog walks at a constant speed along a straight sidewalk.

• A girl runs a long a straight path the same distance each second.

• A truck moves around a curve without changing speed.

Tags

NGSS.MS-PS2-2

What is the distance an object moves per unit of time?

• acceleration

• velocity

• position

• speed

Which has the greatest average speed?

• a boat sailing 80 km in 2 hours

• a car driving 90 km in 3 hours

• a train traveling 120 km in 3 hours

• a truck moving 50 km in 1 hour

An airplane rolls down the runway. Compared to which reference point is the airplane in motion?

• the cargo the plane carries

• the control tower

• the pilot flying the plane

• the plane’s wing