MCAS Review #1 - Motion and Forces

John runs one complete lap of a 400 m track, returning to the starting line. Which one of the following is true?

• John experienced a displacement of 400m.

• John ran a distance of 0m.

• John experienced a displacement of 0m.

• Not enough information was provided.

Jill drives from Newton to Boston. Her ending point is 5 miles east of her starting point but she had to drive 7 miles total since roads don’t go straight east. Which of the following best describes the displacement Jill experienced?

• Jill was displaced 7 miles.

• Jill was displaced 5 miles.

• Jill was displaced 7 miles east.

• Jill was displaced 5 miles east.

The diagram below shows the path of a jet from Washington, D.C. to Dallas, TX. The trip takes approximately 2 hours and covers approximately 1900 km. Which of the following best describes the speed and direction of the jet’s flight?

• 475 km/h southwest

• 950 km/h southwest

• 1900 km/h southwest

• 3800 km/h southwest

The illustration below shows a car slowing down. The car was initially traveling at 15 m/s. The car slows with a negative acceleration of 4.5 m/s². How long does it take the car to slow to a final velocity of 4.0 m/s?

• 0.89 s

• 2.4 s

• 11 s

• 60 s

The graph below illustrates the position and time for a dog that runs to catch a stick and then returns with it. The dog caught the stick after 2 s. What was the dog’s average speed as he returned with the stick?

• His average return speed was 0.7 m/s.

• His average return speed was 0.9 m/s.

• His average return speed was 2 m/s.

• His average return speed was 4 m/s.

The graph below shows a beetle’s movement along a plant stem. During which span of time was the beetle not moving?

• from 0 to 4 minutes

• from 4 to 6 minutes

• from 6 to 14 minutes

• from 14 to 16 minutes

The position-time graph below shows the motion of three people. Which person is accelerating?

• A. Person A is accelerating.

• B. Person B is accelerating.

• C. Person C is accelerating.

• D. None of the people are accelerating.

Which of the following cars is NOT accelerating?

• A car that is slowing down to a stop at a red light.

• A car that is traveling at a constant speed around a sharp curve.

• A car that is speeding up as it passes another car on the highway.

• None of the above. All of the cars described are accelerating.

Which of the following is certain to change as a ball accelerates?

• mass of the ball

• inertia of the ball

• velocity of the ball

• force acting on the ball

• acceleration

• velocity

• speed

• time