(Multiple Choice)

(1)

What effect does the velocity of an elevator have on the apparent weight of a person in the elevator?

(2)

 Suppose you are standing on a scale in descending elevator it comes to a stop on the ground floor. Will the scale’s report of your weight be high, low, or correct?

(3)

A person of weight w is in an elevator going up when the cable suddenly breaks. What is the person’s apparent weight immediately after the cable breaks? 

(a) w 

(b) Greater than w 

(c) Less than w 

(d) 9.8w 

(e) Zero

(4)

Two boxes of mass m1 and m2 connected together by a massless string are accelerated uniformly on a frictionless surface, as shown in Figure. The ratio of the tensions T₁/ T₂ is given by 

(a) m₁/m₂. 

(b) m₂/m₁. 

(c) (m₁+m₂) / m₂. 

(d) m₁ / (m₁ + m₂) 

(e) m₂ / (m₁ + m₂)

(5)

(a) If there are no forces acting on an object, it will not accelerate. 

(b) If an object is not accelerating, there must be no forces acting on it. 

(c) The motion of an object is always in the direction of the resultant force. 

(d) The mass of an object depends on its location.

(6)

A skydiver of weight w is descending near the surface of the earth. What is the magnitude of the force exerted by her body on the earth? 

(a) w 

(b) Greater than w 

(c) Less than w 

(d) 9.8w 

(e) 0 

(f) It depends on the air resistance.

(7)

The net force on a moving object is suddenly reduced to zero. As a consequence, the object 

(a) Stops abruptly. 

(b) Stops during a short time interval. 

(c) Changes direction. 

(d) Continues at constant velocity. 

(e) Changes velocity in an unknown manner.

T1 T2