Describing motion assessment 10 Q

Marisol is sitting in a bus that is passing by a traffic light. Which statement correctly describes Marisol’s motion?

• Marisol is moving relative to both the traffic light and the bus driver.

• Marisol is not moving relative to either the traffic light or the bus driver.

• Marisol is moving relative to the traffic light but not relative to the bus driver.

• Marisol is moving relative to the bus driver, but she is not moving relative to the traffic light.

Which of the following best represents the velocity of the moving bus?

• 40

• 40 miles per hour East

• 40 Miles per hour

• 40 Miles East

Which characteristic of motion could change without changing the velocity of an object?

• Speed

• Direction

• Position

• Acceleration

Which of the following shows a vehicle slowing down?

• Graph A

• Graph B

• Graph C

• Graph D

Which statement best describes the motion of the car over the 20 seconds.

• The car is initially at rest and then backs up for 10 seconds.

• The car moves 20m in the first 10 seconds and then stops.

• The car travels at a constant speed for 10 seconds and then slows down until it stops.

• The car travels the same distance in the first 10 seconds as it does in the last 10 seconds.

A person is sitting on a train that is moving at 100km/h. From which frame of reference is the person NOT moving?

• The ground.

• The train.

• A train moving in the opposite direction.

• A car stopped at a train crossing.

What is the average acceleration of the car during the first 5 seconds of motion?

• 15 m/s2 south

• 20 m/s2 south

• 5 m/s2 south

• 10 m/s2 south

Which statement best describes the car’s acceleration from 6.0 to 8.0 seconds?

• the car did not accelerate

• the car accelerated by increasing speed

• the car accelerated by decreasing speed

• the car accelerated by changing direction

Analyze the two graphs below and choose the answer that best describes them. Graph 1 compares position vs. time and Graph 2 compares velocity vs. time.

• Graph 1 and 2 both show positive acceleration

• Graph 1 shows no acceleration and Graph 2 shows increasing velocity

• Graph 1 and Graph 2 both show constant and positive velocity

• Graph 1 shows increasing velocity and Graph 2 shows constant velocity

Which statement is false?

• Velocity is speed and direction.

• Velocity is only how fast an object goes.

• Direction is only part of velocity

• A compass would be used to measure one part of velocity.