# Physical Science

## Chapter 2: Motion

### Standardized Test Practice

 1. What is Bill's average running speed? (3.0K) A) 3.0 km/min B) 3.3 km/min C) 330 km/min D) 0.33 km/min 2. Which runner has the slowest average speed for this run? (3.0K) A) Jane B) Bill C) Daisy D) Joe 3. If an object has a constant velocity, then it _______. A) has a negative acceleration B) has an acceleration of zero C) has a positive acceleration D) is not moving 4. The speed of light in a vacuum is 300,000.0 km/s. How long does it take light to travel 150,000,000 km from the sun to Earth? A) 2100 seconds B) 8.3 minutes C) 4500 seconds D) 0.25 hour 5. A change in velocity means a change in _______. A) direction only B) speed only C) either speed or direction D) always both speed and direction 6. According to Newton's first law of motion, a moving object _______. A) gradually slows and then stops B) has a constant positive acceleration C) transfers energy to its environment D) continues moving at the same velocity unless a force acts on it 7. As you brake your bicycle, your speed changes from 20 m/s to 10 m/s in 5 seconds. What is your acceleration? A) -10 m/s2 B) 2 m/s2 C) 10 m/s2 D) -2 m/s2 8. What was Swimmer C's average speed? (10.0K) A) 4.8 km/h B) 2.4 km/h C) 2400 km/h D) 4800 km/h 9. What was Swimmer A's average speed during the period 10 min to 20 min? (10.0K) A) 40 m/min B) 0 m/min C) 400 m/min D) 4000 m/min 10. A piece of paper, motionless on top of your desk, experiences _______. A) balanced force B) no force C) positive net force D) unbalanced force