Choose the correct answer

1			The rate at which an object travels a certain distance is known as
			A)	velocity.
			B)	speed.
			C)	momentum.
			D)	acceleration.
2			While driving between Pittsburgh and Chicago, the driver of the car looks at the car's speedometer and notes a speed of 50 miles/hour. The speedometer is indicating the car's
			A)	average speed.
			B)	velocity.
			C)	terminal speed.
			D)	instantaneous speed.
3			Which one of the following represents a vector quantity?
			A)	750 miles/h
			B)	60 cycles/second
			C)	220 volts
			D)	55 km/h toward the north
4			The acceleration due to gravity at the earth's surface is
			A)	32 m/s2.
			B)	9.8 m/s2.
			C)	1.6 m/s2.
			D)	5.4 m/s2.
5			Newton's first law of motion deals with
			A)	force.
			B)	acceleration.
			C)	weight.
			D)	inertia.
6			A tennis player hits a tennis ball with a tennis racquet. If the force supplied by the racquet to the ball is the action force, what would be the reaction force?
			A)	The force transmitted from the racquet to the tennis player's arm.
			B)	The resistance of air molecules on the tennis ball.
			C)	The force exerted by the tennis ball on the racquet.
			D)	The force exerted by the tennis ball on the opposing player's racquet.
7			A bowling ball and a marble are dropped at the same time in a vacuum chamber. Which one of the following statements correctly describes the results?
			A)	The bowling ball will land first.
			B)	The acceleration of the bowling ball is greater than that of the marble.
			C)	Both have the same speed upon landing.
			D)	The force of impact will be the same for both the bowling ball and the marble.

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0077263960/649625/chapter2_2.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (35.0K)</a>

Refer to the above drawing to answer questions 8 and 9. A ball is thrown upward and is shown at several positions along its trajectory.

8			The speed of the ball at point C is
			A)	greater than at point A.
			B)	at its maximum.
			C)	zero.
			D)	9.8 m/s.
9			The time interval between each change in position of the ball is
			A)	greatest between points F and G.
			B)	at a minimum between points B and C and points C and D.
			C)	shortest between points F and G.
			D)	approximately equal.

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0077263960/649625/Chapter2_1.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (38.0K)</a>

Refer to the above drawing to answer questions 10–12.

10			Given that Fc = centripetal force, v = speed, m = mass, and r = radius, doubling the value of m would
			A)	reduce the value of Fc by 1/2
			B)	double the value of Fc
			C)	quadruple the value for Fc
			D)	have no effect on the value of Fc
11			Doubling the value of v would
			A)	reduce the value of Fc by 1/2.
			B)	quadruple the value of Fc.
			C)	double the value of Fc.
			D)	have no effect on the value of Fc.
12			Doubling the value of r would
			A)	double the value of Fc.
			B)	reduce the value of Fc by 1/2.
			C)	quadruple the value of Fc.
			D)	have no effect on the value of Fc.

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0077263960/649625/chapter2_3.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (35.0K)</a>

Refer to the above drawing to answer questions 13 and 14.

13			The string
			A)	provides gravitational force.
			B)	represents the force of inertia.
			C)	represents the center of mass.
			D)	provides centripetal force.
14			The centripetal force vector Fc is always
			A)	tangent to the circle.
			B)	directed toward the center of the circle.
			C)	directed vertically toward the earth.
			D)	directed away from the center of the circle.

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0077263960/649625/chapter2_4.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (35.0K)</a>

Refer to the above drawing to answer question 15. The car was originally at rest.

15			The best explanation for the position of the passengers within the car is
			A)	the car's sudden start throws the passengers back into their seats.
			B)	the passenger's inertia tends to keep them in their original positions as the car (and the seats) move forward.
			C)	the car's forward acceleration is balanced by the opposing force of the passengers moving backward in their seats.
			D)	the car's seats broke at the moment of acceleration.