Workbook pg. 82-83

A car traveling 50 km/hour slows to a stop, turns right, and then gradually resumes its original speed in 60 seconds. This could best be described as a change in —

• speed

• velocity

• acceleration

• all of the above

Two students were given the following warm-up instructions in physical education class.

At what point did the students’ velocities change due to direction?

• Point 1

• Point 2

• Point 3

• Point 4

An athlete goes for a run. The athlete runs 5 kilometers per hour, then makes a right-hand turn, and his speed changes to 8 kilometers per hour. Which statement best describes the athlete’s run?

• The athlete experienced a decrease in acceleration.

• The athlete experienced no acceleration.

• The athlete experienced an increase in acceleration.

• The athlete experienced an increase in speed but experienced no acceleration.

A student collects data while walking to school one morning. The student uses a timing device to time how long it takes to walk to school and a pedometer to measure the distance walked. With the data collected, the student can calculate —

• acceleration

• speed

• velocity

• not here

How can values for velocity and acceleration be distinguished?

• Velocity is change in position over time. Acceleration is change in speed over time.

• Velocity is change in speed over time. Acceleration is change in position over time.

• Velocity is change in speed divided by change in time. Acceleration is speed with direction

• Velocity is speed with direction. Acceleration is change in velocity over time.

Which statement best describes the acceleration of a tennis ball?

• The tennis ball rolls a distance of 4 meters in 1.5 seconds

• The tennis ball moves at an average speed of 2 m/s

• The tennis ball began at rest & rolls at a rate of 14.7 m/s after 1.5 seconds

• The tennis ball rolls to the right at an average speed of 2 m/s

The student creates an illustration to model the difference between speed and velocity.

Which statement describes an advantage of this model?

• The model illustrates that speed and velocity are two words with the same meaning.

• The model illustrates the similarities and differences between speed and velocity.

• The model illustrates that velocity is the same as acceleration.

• The model illustrates how speed and velocity are related to acceleration.

A group of students investigates the speed of a cart traveling down a ramp and records data.

Which graph best represents the data collected during the investigation?

• 
• 
• 
• 

A runner records workout information on a cell phone. The screenshots provide two different representations of the same run.

Which screenshot is more accurate when calculating the runner’s speed each minute?

• Screenshot 1- Graph

• Screenshot 2- Map

• Both would be equally accurate

• None of the above

A man drives 50 km/h east. He sees rocks in the road and decreases his velocity to 20 km/h east.

How does his change in speed affect his acceleration?

• He accelerates, because he changed velocity.

• He did not accelerate, because he kept moving in the same direction

• He accelerates, because he changed direction.

• He did not accelerate, because slowing down is the opposite of acceleration