Speed and Velocity

The rate at which an object changes its location.

• speed

• velocity

• vector

• scalar

Tags

NGSS.MS-PS3-1

Like distance, speed is a _____________ because it has a magnitude but not a direction.

Its speed at a specific instant in time, however, is its _______________. A car's speedometer describes its ________________.

• instantaneous speed

• instantaneous velocity

• scalar

• vector

Brayden throws a baseball from the pitcher’s mound to home plate in 0.46 s. The distance is 18.4 m. What was the average speed of the baseball?

• 40 m/s

• -40 m/s

• .03 m/s

• 8.5 m/s

Kayla walked to her friend’s house with an average speed of 1.40 m/s. The distance between the houses is 205 m. Approximately, how long did the trip take her?

• 146 s

• 2.5 min

• 287 s

• .01 s

The vector version of speed is ____________.

If you consider infinitesimally small intervals, you can define ______________, which is the velocity at a specific instant in time.

• instantaneous velocity

• instantaneous speed

• displacement

• distance

Instantaneous velocity and average velocity are _______ if the velocity is constant.

• equal

• different

• greater

• less

________________describes the speed and direction of an object.

• Speed

• Velocity

• Magnitude

• Scalar

A bird flies with an average velocity of 7.5 m/s east from one branch to another in 2.4 s. It then pauses before flying with an average velocity of 6.8 m/s east for 3.5 s to another branch. What is the bird’s total displacement from its starting point?

• 42 m west

• 6 m west

• 6 m east

• 42 m east