U4 - Basic Motion Reviewed

U4 - Basic Motion Reviewed

by Mike Martz

​Key Terms

• Relative​

• Distance

• ​Displacement

• ​Speed

• ​Velocity

• ​Average

• ​Instantaneous

​Distance vs Displacement

Multiple Choice

A child is riding a bike back and forth along a sidewalk.  They start at the green and end at the red.  What is the child's displacement?

• 5 m

• 10 m

• -4 m

• 1 m

Multiple Choice

A child is riding a bike back and forth along a sidewalk.  They start at the green and end at the red.  What is the child's total distance?

• 10 m

• 5 m

• 15 m

• -4 m

Did you miss one of those Q​uestions?

​ASK FOR HELP - you need to understand distance & displacement to go on

​Speed vs Velocity

Multiple Choice

A truck is making a long road trip from Idaho to Texas.  During one long portion, the trucker is able to go 210 miles in 3 hours.  The speed of the truck is...

• 70 mi/hr

• 0.14 mi/hr

• 21 mi/hr

• 3 hrs

Multiple Choice

A truck is making a long road trip from Idaho to Texas.  During one long portion, the trucker is able to go 210 miles in 3 hours.  What do we know about the speed and velocity of the truck?

• Nothing, we can't solve for either.

• We can find velocity, but not speed.

• We can find speed, but not velocity since we don't know the truck's displacement.

• Speed and velocity are equal because distance and displacement are the same in those 3 hours.

Multiple Choice

Let's say the child rides this route (from green to red) in 5 seconds. The child's speed would be...

• 2 m/s

• 0.8 m/s

• 3 m/s

• 1 m/s

Multiple Choice

Let's say the child rides this route (from green to red) in 5 seconds. The child's velocity would be...

• 2 m/s

• 0.8 m/s

• 3 m/s

• 1 m/s

​Average vs Instantaneous

​Both terms can apply to speed and/or velocity...

• Instantaneous (speed or velocity) is the rate of the object in a specific moment. For example... "what is the speed at 3.5 s into the trip?"​

• Average (speed or velocity) is the rate of an object over a span of time. For example... "what is the velocity of the object from 2 - 5 seconds?"

• ​SOMETIMES the two are the same value.

• ​ANYTIME you use the s = d/t or v = x/t equations you get an average over the time span entered for "t."

Multiple Choice

What does the speedometer in a car show the driver?

• Instantaneous speed

• Instantaneous velocity

• Average speed

• Average velocity

Multiple Choice

A student walks the 1.2 miles from school to their house in 0.25 hours (15 min). Since s = d/t we know s = 4.8 mi/hr. What is this "4.8 mi/hr?"

• Instantaneous speed

• average speed

• instantaneous velocity

• average velocity

Multiple Choice

Using data... Note how much time it took this object to get from 2m to 6m. What is the object's velocity in this time?

• 2 m/s

• 6 m/s

• 4 m/s

• Not enough info

Multiple Choice

Using data... Note where the object starts at t = 0 and where it ends at t = 6 s. What is the object's ave velocity in this time?

• 3 m/s

• 0.33 m/s

• 0 m/s

• Not enough info

Multiple Choice

Using data... Note where the object starts at t = 0 and where it ends at t = 6 s. What is the object's ave speed in this time?

• 3 m/s

• 1.33 m/s

• 0 m/s

• Not enough info

Did You Get Most Correct? Or Mostly Incorrect​

Ask for extra help to clarify concepts if you missed more than 2​