This lesson covers the concepts of speed and velocity. Speed is defined as a scalar quantity with magnitude and units, while velocity is a vector that includes direction. The lesson explains average and instantaneous speed, as well as average and instantaneous velocity. It also discusses how to use equations to calculate displacement and time, and highlights the difference between instantaneous and average velocity, especially when velocity is constant or changing.

What is the main focus of the previous lesson?

• Energy and work

• Distance and displacement

• Force and motion

• Speed and velocity

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS2-4

Which of the following is true about speed?

• It includes direction.

• It has no units.

• It is a vector quantity.

• It is a scalar quantity.

How is average speed calculated?

• Distance traveled divided by time of travel

• Final speed minus initial speed

• Total distance divided by total displacement

• Displacement divided by time of travel

What is instantaneous speed?

• The speed of an object in a specific direction

• The average speed of an object

• The speed of an object at a specific moment in time

• The speed of an object over a long period

What does velocity include that speed does not?

• Time

• Magnitude

• Direction

• Units

How is average velocity calculated?

• Final velocity minus initial velocity

• Displacement divided by time of travel

• Distance traveled divided by time of travel

• Total distance divided by total time

What is the equation for displacement over time?

• D = T subf - T sub0

• D = D subf - D sub0

• D = T sub0 - T subf

• D = D sub0 - D subf

When is instantaneous velocity equal to average velocity?

• When speed is constant

• When velocity is changing

• When velocity is constant

• When speed is changing

What happens to instantaneous velocity when velocity is changing?

• It remains constant

• It is no longer the same as average velocity

• It becomes equal to average velocity

• It becomes zero

What is the final time minus the initial time called?

• Displacement

• Instantaneous speed

• Average speed

• Change in time