Calculating Velocity and Acceleration

The correct equation to calculate speed is

• distance/time
• time/distance
• distance x time
• distance/time²

Which formula is used to find average velocity?

• V_avg = (r_final - r_initial)/(t_final - t_initial)
• V_avg = (r_initial - r_final)/(t_initial - t_final)
• V_avg = (a_final - a_initial)/(t_final - t_initial)
• V_avg = (a_initial - a_final)/(t_initial - t_final)

What is the formula for calculating speed?

•  $speed\ =\ \frac{dis\tan ce}{time}$  

•  $speed\ =\ \frac{time}{dis\tan ce}$  

•  $speed=dis\tan ce\ \times\ time$  

•  $speed\ =\ dis\tan ce\ +\ time$  

Pick all of the following that are velocities.

• 4 km/s west

• 5 cm/h south

• 2 mph

• 8 cycles/year

• 5 m/s up

 $a=\frac{v_{final}-v_{initial}}{time}$  

Mark slams on the brakes after traveling 25 m/s. It takes him 3 seconds to come to a complete stop. What is his acceleration?

• 8.33 m/s²

• -8.33 m/s²

• 75 m/s²

• -75 m/s²

Tags

NGSS.HS-PS2-1

Total distance divided by total time, for an object shows:

• acceleration

• average acceleration

• absolute speed

• average speed

A plane flying 300 mph west toward California is an example of...

• Speed

• Velocity

• Acceleration

• Direction

If you slow down on your bicycle, you accelerate.

• TRUE
• FALSE

Changing the speed and changing the direction of your bicycle are both examples of acceleration.

• TRUE
• FALSE

Tags

NGSS.MS-PS2-2

You are riding your bike at 9 km/h. Ten minutes later, your speed is 6 km/h.

• Acceleration occurred because speed increased.
• Acceleration occurred because speed decreased.
• Acceleration occurred because you changed directions.