Physical Science Unit 4 Review

1) What was the hiker's average velocity during part A of the hike?

• a) 0.10 km/h north

• b) 4.0 km/h south

• c) 6 km/h east

• d) 10 km/h southwest

2) Which statement provides the most complete description of an object's motion?

• a) The hiker followed the south trail a distance of five kilometers in 45 minutes.

• b) The cheetah ran 45 km per hour to catch its prey.

• c) A car travels 60 miles.

• d) A ball rolled 20 meters to the left.

3) Which of the following information is necessary to describe an object's motion?

• a) position

• b) direction

• c) speed

• d) position, direction, and speed

4) A cyclist rode at an average speed of 15 mph for 60 miles. How long was the ride?

• a) 4 hours

• b) 2 hours

• c) 1 hour

• d) 3 hours

5) A car traveled at an average speed of 65 mph for 10 hours. How far did it travel?

* Remember D = rt

• a) 10

• b) 65

• c) 650

• d) 6500

6) John gets up from his seat on a train to move closer to the front. Just as he begins to walk forward, the train stops at a station.

What is the best explanation of what happens to John?

• a) While John is walking, his body is in motion. When the train stops, because he's not buckled in, John continues to move forward due to inertia.

• b) While John is walking, his body is in motion. When the train stops, an unbalanced force accelerates his body backward.

• c) While John is walking, his body is in motion, but as the train stops, it exerts a force on John opposite to the direction he is walking, causing him to stop as well.

• d) While John is walking, he is in motion due to the force of repulsion. When the train stops, he is catapulted forward due to the train's stronger force of attraction.

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7) Which characteristic does inertia describe?

• a) How large an object is.

• b )How long an object is.

• c) How difficult it is to change an object's motion.

• a)How fast an object is moving.

8) Which statement best describes how velocity and acceleration are related?

• a) Acceleration is another word for velocity.

• b) Velocity is the rate of change in acceleration.

• c) Acceleration is always negative, and velocity is always positive.

• d) Acceleration is the rate of change of velocity.

• a) 0.31 m/s

• b) 3.3 m/s

• c) 9.8 m/s

• d) 29.4 m/s

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10) An ant traveled 30 seconds at a speed of .5 ft./s.

How far did the ant travel?

• a) 1.5 feet

• b) 60 feet

• c) 15 feet

• d) 20 feet