Question 1

Suppose you're coasting in a car at 60 km/h and apply the brakes until you slow to 40 km/h. When you suddenly release the brake, the car tends to

Accepted Answer

A) momentarily regain its higher initial speed. 
B) continue moving at 40 km/h in the absence of forces. 
C) decrease in speed whether other forces act or not.

Question 2

A given net force propels an object along a straight-line path by a force. If the mass were doubled, its acceleration would

Accepted Answer

A) quadruple. 
B) double. 
C) stay the same. 
D) be half. 
E) none of the above

Question 3

How many forces act on an upwardly tossed coin when it gets to the top of its path?

Accepted Answer

A) one; the force due to gravity 
B) two; gravity and the force in the coin itself 
C) three; gravity, the coin's internal force, and a turnaround force 
D) none of the above

Question 4

A skydiver steps from a helicopter and falls for 5 s before reaching terminal velocity. During this 5-s interval, her acceleration

Accepted Answer

A) is constant. 
B) increases. 
C) decreases. 
D) is zero. 
E) none of the above

Question 5

Arnold Strongman and Suzie Small have a tug-of-war on a polished floor. Arnold wears socks and Suzie wears gym shoes. The likely winner is

Accepted Answer

A) Arnold. 
B) Suzie. 
C) neither, a tied score 
D) no basis for predicting

Question 6

A girl pulls on a 10-kg wagon with a constant force of 30 N. What is the wagon's acceleration?

Accepted Answer

A) 0.3 m/s2 
B) 3.0 m/s2 
C) 10 m/s2 
D) 30 m/s2 
E) 300 m/s2

Question 7

A push on a 1-kg brick accelerates the brick. Neglecting friction, to equally accelerate a 10-kg brick requires the force to be

Accepted Answer

A) just as much. 
B) 10 times as much. 
C) 100 times as much. 
D) one-tenth the amount. 
E) none of the above

Question 8

A 1-kg ball is thrown straight up at 10 m/s. Neglecting air resistance, the net force that acts on the ball when it is half way to the top of its path is

Accepted Answer

A) 1/2 N. 
B) 1 N. 
C) 5 N. 
D) 7.5 N. 
E) 10 N.

Question 9

A pair of tennis balls fall through the air from a tall building. One ball is regular and the other is filled with lead pellets. The ball to reach the ground first is the

Accepted Answer

A) regular ball. 
B) lead-filled ball. 
C) same for both

Exam 2: Newtons Laws of Motion