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Physical Science, 5/e

Motion

# Essay Quiz

 1 What is the difference between speed and velocity? 2 What is acceleration? 3 An insect inside a bus flies from the back toward the front at 5.0 mi/hr. The bus is moving in a straight line at 50.0 mi/hr. What is the speed of the insect? 4 Explain what happens to the velocity and the acceleration of an object in free fall. 5 In the equation d = 1/2at2, if g is 9.8 m/s2 and t is in s, what is the unit for d? 6 What is inertia? 7 In the unit of acceleration 9.8 m/s2, what is the meaning of a "square second"? 8 Disregarding air friction, describe all the forces acting on a bullet shot from a rifle into the air. 9 Can gravity act in a vacuum? Explain. 10 Does the force of gravity acting on a ball change as the ball is thrown straight up from near the surface of the earth? Explain. 11 How does the velocity of a ball thrown straight up compare to the velocity the ball has when it falls to the same place on the way down? Explain. 12 Are there any unbalanced forces acting on an object that falls a short distance? Explain.