Speed Velocity and Acceleration

Which of the following distinguishes the speed of an object from its velocity?

• Calculating speed requires knowing distance; calculating velocity does not require knowing distance.

• Velocity includes the direction of the motion of an object; speed does not include direction of motion.

• Speed includes the time it took the object to travel; velocity does not include travel time.

• Speed includes the direction of the motion of an object; velocity does not include direction of motion.

Which of the following is a complete description of the velocity of an object in motion?

• A train travels due west at 90 km/h.

• A 7 kg bowling ball rolls a distance of 20 m in 3 s.

• A runner jogs 6 km/h for 10 minutes.

• Birds fly 600 km south for the winter.

When an object accelerates, what about its motion changes?

• Speed must change, but not velocity.

• Both speed and velocity must change.

• Velocity must change, but not speed.

• Neither speed or velocity can change.

An image of a cue ball striking the surface of a pool table is shown. All of the following describe the acceleration of the cue ball EXCEPT (click the image to enlarge it)-

• the ball changed direction when it hit the side of the table.

• the ball traveled at 30 cm/s while it was moving.

• the ball was at rest until it was struck by the pool cue.

• the ball eventually came to a stop due to friction.

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Which of following gives the best description of speed?

• A school bus travels 40 km in an hour.

• An airplane flies south for a time of 2 h.

• A freight train travels 500 km in a day.

• A hot air balloon travels at 35 km/h from Albuquerque to Santa Fe.

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NGSS.MS-PS3-1

Which of the following describes the speed, but not the velocity of an object?

• 60 miles per hour

• 60 miles per hour south

• 30 miles north

• 30 miles per hour south

In order to describe the velocity of an object, which three pieces of data are needed?

• -The mass of the object in grams - The speed at which the object traveled - The pull of gravity on the object

• -The distance traveled by the object - The time taken to travel - The direction of travel

• -The mass of the object in grams - The time taken to travel - The acceleration of the object

• -The distance traveled by the object - The force the object had on another object - The mass of the object in grams