Force and Motion Review

Randy is sledding down a hill away from his sister, Leslie, who is standing at the top of the hill. At first, Randy moves at a constant speed down a nearly flat part of the hill. Then, suddenly, the hill becomes much steeper, and Randy almost immediately starts moving at a much faster speed. Which graph shows Randy's position as he moves away from his sister?

• W

• X

• Y

• Z

Megan is waiting for the school bus. She first sees it stopped down the street at one of her neighbors houses. Which graph shows the position of the bus relative to Megan from the moment she first saw it?

• W

• X

• Y

• Z

What two variables determine how an object will accelerate?

• Force and Mass

• Force and Velocity

• Velocity and Mass

• Mass and Time

Erma is flying a spacecraft through outer space. It's position over a 40-second time period is charted below. Which of the following graphs could be the position vs time graph for Erma's spacecraft?

• W

• X

• Y

• Z

_______ measures an object's change in position per unit time and its direction of motion.

• Speed

• Velocity

• Acceleration

• Distance

Starting from his house, Madoc rode his bike 300 m to the east, then 100 m to the north. Which of the following vector diagrams shows Madoc's path? (Note: The height and width of each square in the grids is 100 m.)

• W

• X

• Y

• Z

Before a race, an athlete warms up by jogging around the track shown below at a constant rate of 2.3 m/s. What statement best describes his motion as he jogs around the curved part of the track?

• His speed and velocity both stay the same.

• His speed and velocity both change.

• His speed stays the same, but his velocity changes.

• His speed changes, but his velocity stays the same.

Which of these best explains how velocity is different from speed?

• Speed includes a distance and velocity does not.

• Speed includes a direction and velocity does not.

• Velocity includes a direction and speed does not.

• Velocity includes a distance and speed does not.

The graph shows how the position of an object changes over time. Assuming that the motion of the object remains the same, where will the object be positioned when it has traveled for a total of 5 s?

• 1 m

• 4 m

• 5 m

• 6 m

The position vs. time graph can be used to describe Jim's motion as he rides his motorcycle. Which of the following is true?

• Jim and his motorcycle are standing still.

• Jim is riding his motorcycle at a speed of five meters per second.

• Jim and his motorcycle are slowing down.

• Jim is riding the motorcycle in a straight line.