Measuring Motion

How are speed and velocity different?

• Velocity includes a reference direction, speed does not
• Speed includes a reference direction, where velocity does not
• They are not different
• Speed is not measured using metrics

The formula for speed is:

• (Final distance - starting distance)  ÷ time
• Distance × time
• Time ÷ distance
• Distance ÷ time

The formula for acceleration is:

• Distance ÷ time
• Final time × speed
• (Final  velocity - initial velocity) ÷ time it took to get there
• (Initial velocity - final velocity) ÷ time it took to get there

A skater is skating at 2 m/s and increases to 8 m/s in 4 seconds. What is her acceleration?

• 2 m/s²
• 1.5 m/s²
• 10 m/s²
• 2.5 m/s²

A change in position relative to a reference point is called ___________.

• motion
• acceleration
• velocity
• speed

The rate of velocity change over time is called ____________.

• velocity
• motion
• speed
• acceleration

The distance an object moved over the time in which the motion took place is called __________.

• velocity
• motion
• speed
• acceleration

Reference points used to measure speed usually do not move.

• True
• False

A bus travels 47 m/s E and you walk to the back at 3 m/s.  What is the resultant velocity?

• 44 m/s W
• 50 m/s E
• 50 m/s W
• 44 m/s E

The SI unit for speed is:

• km/hr
• m/s
• mi/hr
• ft/s