NEWTON'S LAWS TEST REVIEW 7.7

What is the average speed of the toy car?

• 0.2 m/s

• 0.2 s/m

• 5 m/s

• 5 s/m

Tags

NGSS.MS-PS3-1

Kristina investigated the average speeds her father drove when he picked her up after school, took her to soccer practice, and then went home in kilometers per hour (km/hr). She constructed the data table to the left.

What are the average speeds Kristina calculated for each part of her trip? calculate the average for each and enter correctly in the space.

work to school​

school to practice​​

practice to home​​​ ​

• 15 km/hr

• School To practice

• 20 km/hr

• WORK TO SCHOOL

• 12 km/hr

• Practice to home

Chloe calculated the average speed she walked one afternoon. First, she walked 0.5 kilometer to a park, which took her 0.1 hour. Then, she walked to an ice cream shop 1.5 km from the park, which took her 0.4 hour. Then she walked 2.0 km back to her house in 0.5 hour.

What is Chloe’s average speed for the entire trip?

• 2.0 km/hr

• 3.8 km/hr

• 4.0 km/hr

• 5.0 km/hr

It takes one hour for an airplane to travel north for 750 kilometers (km).

What is the airplane’s average velocity?

• 750 km

• 750 km/hr

• 750 km north

• 750 km/hr north

Camila wants to investigate the average speed of a train in the Dallas Area Rapid Transit system as it travels from the beginning of a route to the end. What pieces of information does Camila need to collect AND how should she gather data to determine average speed along the route?

• Camila needs to collect the total distance of the route and the total time taken to travel from start to end. She should gather data by timing the journey and measuring the distance.

• Camila needs to collect the number of stops along the route and the time spent at each stop. She should gather data by counting stops and timing the duration at each.

• Camila needs to collect the speed of the train at various points along the route. She should gather data by using a speedometer.

• Camila needs to collect the number of passengers on the train and the time of day. She should gather data by counting passengers and noting the time.

Tags

NGSS.MS-PS3-1

Mr. Wilson drove 40 kilometers east in 1 hour and then 50 kilometers west during the next hour. How can Mr. Wilson’s motion be described? Write the letter of ONE correct answer on each line. The total distance Mr. Wilson traveled is ___________ km. His displacement is ___________ km. Mr. Wilson’s average speed is ___________ km/hr and the value of his average velocity is ___________ km/hr.

• The total distance Mr. Wilson traveled is 90 km. His displacement is 10 km west. Mr. Wilson’s average speed is 45 km/hr and the value of his average velocity is 5 km/hr west.

• The total distance Mr. Wilson traveled is 80 km. His displacement is 10 km east. Mr. Wilson’s average speed is 40 km/hr and the value of his average velocity is 5 km/hr east.

• The total distance Mr. Wilson traveled is 90 km. His displacement is 0 km. Mr. Wilson’s average speed is 45 km/hr and the value of his average velocity is 0 km/hr.

• The total distance Mr. Wilson traveled is 100 km. His displacement is 10 km west. Mr. Wilson’s average speed is 50 km/hr and the value of his average velocity is 10 km/hr west.

Amanda and James measure the speed of two cars on the same road. Car A is traveling north at 40 km/h and Car B is traveling south at 40 km/h. Which statement correctly compares the speed and velocity of the two cars?

• The velocities are different because the cars are moving in different directions but at the same speed.

• The velocities are different because the cars are moving in different directions and at different speeds.

• The velocities are the same because both cars have the same mass and are moving at the same speed.

• The velocities are the same because both cars are moving on the same road and with the same speed.

Marc and Ying rode in a car with Ying’s father from Ying’s house to the grocery store and then back to Ying’s house. They made a distance-time graph to measure the motion of the car.

How does the graph describe their motion?

Choose the correct option.

The graph shows that they drove to the store at a _________ speed and returned home at a ___________ speed. Time at the store is indicated by the ___________ part of the plot.

• A. They drove at a constant speed both ways.

• B. They drove to the store at a constant speed and returned home at a varied speed. Time at the store is indicated by the flat part of the plot.

• C. They drove to the store at a varied speed and returned home at a constant speed. Time at the store is indicated by the sloped part of the plot.

• D. They drove at a varied speed both ways.

Tags

NGSS.MS-PS3-1

Aria and Tyler go to school on the bus. They travel 2 kilometers in 4 minutes and then stop to pick up more students. They begin again traveling another 3 kilometers in 2 minutes. They stop one last time and then travel 3 more kilometers to school. Which distance-time graph BEST records the motion they took to school on the bus?

• A

• B

• C

• D

Jake and Dana analyze a graph and look for patterns to describe their trip. Which statements correctly describe the speed and motion of their trip? Click THREE correct answers.

• They were stopped along segment B.

• Their fastest speed was along segment C.

• Their slowest speed was along segment D.

• Their speed along segment B was 5 km/h.

• Their speed along segment A was 15 km/h.

Tags

NGSS.MS-PS3-1