TEST: Describing Motion

Calculate the average speed of a car that travels 150 kilometers in 3 hours.

For this question: only enter the numerical answer.

Mathematical Equivalence

ON

A runner completes a 400-meter lap in 50 seconds. What is the runner's average speed?

• 6 m/s

• 7 m/s

• 8 m/s

• 9 m/s

Tags

DOK Level 1: Recall

TEKS.SCI.7.7A

Explain how you would distinguish between speed and velocity when describing the motion of a car moving in a straight line.

• Speed is the rate of change of distance, while velocity includes direction.

• Speed includes direction, while velocity is only the rate of change of distance.

• Speed and velocity are the same in linear motion.

• Speed is a vector quantity, while velocity is a scalar quantity.

Tags

DOK Level 2: Skill/Concept

TEKS.SCI.7.7B

Given a distance-time graph, how would you determine the speed of an object?

• By finding the area under the graph.

• By calculating the slope of the graph.

• By measuring the height of the graph.

• By counting the number of data points.

Tags

TEKS.SCI.7.7C

DOK Level 2: Skill/Concept

Interpret the motion of an object that has a distance-time graph with a constant positive slope.

• The object is at rest.

• The object is moving at a constant speed.

• The object is accelerating.

• The object is decelerating.

Tags

TEKS.SCI.7.7C

DOK Level 2: Skill/Concept

A car travels 100 km east and then 100 km west. What is the car's total displacement?

• 200 km

• 100 km

• 0 km

• 50 km

Tags

DOK Level 1: Recall

TEKS.SCI.7.7B

A student records the motion of a toy car on a distance-time graph. The graph shows a curve that becomes steeper over time. What does this indicate about the toy car's motion?

• The toy car is moving at a constant speed.

• The toy car is accelerating.

• The toy car is decelerating.

• The toy car is at rest.

Tags

TEKS.SCI.7.7C

DOK Level 3: Strategic Thinking

Plan an experiment to measure the average speed of a remote-controlled car over a 10-meter track. What steps would you include?

• Measure the time taken for the car to travel 10 meters and calculate speed using the formula: speed = distance/time.

• Record the car's speed at different points and average them.

• Use a stopwatch to time the car and divide the total time by the distance.

• Measure the car's speed using a speedometer.

Tags

DOK Level 3: Strategic Thinking

TEKS.SCI.7.7A

A distance-time graph shows a horizontal line. What does this indicate about the object's motion?

• The object is moving at a constant speed.

• The object is accelerating.

• The object is decelerating.

• The object is at rest.

Tags

TEKS.SCI.7.7C

DOK Level 1: Recall

Which of the following would you need to design a method to distinguish between speed and velocity using a toy car and a straight track.

• Measure the time taken for the car to travel the track and calculate speed.

• Record the direction of the car's motion and calculate velocity.

• Use a stopwatch to time the car and note the direction to determine velocity.

• All of the above.

Tags

DOK Level 3: Strategic Thinking

TEKS.SCI.7.7B