Question 1

A 90-kg man stands in an elevator that is moving up at a constant speed of 5.0 m/s. The force exerted by him on the floor is about:

Accepted Answer

A)  zero 
B)  90 N 
C)  880 N 
D)  450 N 
E)  49 N 
A)  zero 
B)  90 N 
C)  880 N 
D)  450 N 
E)  49 N

Question 2

A heavy wooden block is dragged by a force   along a rough steel plate, as shown below for two cases. The magnitude of the applied force   is the same for both cases. The normal force in (ii), as compared with the normal force in (i) is:

Accepted Answer

A)  the same 
B)  greater 
C)  less 
D)  less for some angles of the incline and greater for others 
E)  less or greater, depending on the magnitude of the applied force   
A)  the same 
B)  greater 
C)  less 
D)  less for some angles of the incline and greater for others 
E)  less or greater, depending on the magnitude of the applied force

Question 3

Three books (X, Y, and Z) rest on a table. The weight of each book is indicated. The net force acting on book Y is:

Accepted Answer

A)  4 N down 
B)  5 N up 
C)  9 N down 
D)  zero 
E)  none of these 
A)  4 N down 
B)  5 N up 
C)  9 N down 
D)  zero 
E)  none of these

Question 4

Two blocks weighing 250 N and 350 N respectively, are connected by a string that passes over a massless pulley as shown. The tension in the string is:

Accepted Answer

A)  210 N 
B)  290 N 
C)  410 N 
D)  500 N 
E)  4900 N 
A)  210 N 
B)  290 N 
C)  410 N 
D)  500 N 
E)  4900 N

Question 5

An object rests on a horizontal frictionless surface. A horizontal force of magnitude F is applied. This force produces an acceleration:

Accepted Answer

A)  only if F is larger than the weight of the object 
B)  only while the object suddenly changes from rest to motion 
C)  always 
D)  only if the inertia of the object decreases 
E)  only if F is increasing 
A)  only if F is larger than the weight of the object 
B)  only while the object suddenly changes from rest to motion 
C)  always 
D)  only if the inertia of the object decreases 
E)  only if F is increasing

Question 6

Three blocks (A,B,C), each having mass M, are connected by strings as shown. Block C is pulled to the right by a force   that causes the entire system to accelerate. Neglecting friction, the net force acting on block B is:

Accepted Answer

A)  zero 
B)    
C)    
D)    
E)    
A)  zero 
B)    
C)    
D)    
E)

Question 7

A 25-N crate is held at rest on a frictionless incline by a force that is parallel to the incline. If the incline is 25   above the horizontal the magnitude of the applied force is:

Accepted Answer

A)  4.1 N 
B)  4.6 N 
C)  8.9 N 
D)  11 N 
E)  23 N 
A)  4.1 N 
B)  4.6 N 
C)  8.9 N 
D)  11 N 
E)  23 N

Question 8

A 400-N steel ball is suspended by a light rope frome the ceiling.. The tension in the rope is:

Accepted Answer

A)  400 N 
B)  800 N 
C)  zero 
D)  200 N 
E)  560 N 
A)  400 N 
B)  800 N 
C)  zero 
D)  200 N 
E)  560 N

Exam 5: Force and Motion I

A 90-kg man stands in an elevator that is moving up at a constant speed of 5.0 m/s. The force exerted by him on the floor is about:

A heavy wooden block is dragged by a force along a rough steel plate, as shown below for two cases. The magnitude of the applied force is the same for both cases. The normal force in (ii), as compared with the normal force in (i) is:

Three books (X, Y, and Z) rest on a table. The weight of each book is indicated. The net force acting on book Y is:

Two blocks weighing 250 N and 350 N respectively, are connected by a string that passes over a massless pulley as shown. The tension in the string is:

An object rests on a horizontal frictionless surface. A horizontal force of magnitude F is applied. This force produces an acceleration:

Three blocks (A,B,C), each having mass M, are connected by strings as shown. Block C is pulled to the right by a force that causes the entire system to accelerate. Neglecting friction, the net force acting on block B is:

A 25-N crate is held at rest on a frictionless incline by a force that is parallel to the incline. If the incline is 25 above the horizontal the magnitude of the applied force is:

A 400-N steel ball is suspended by a light rope frome the ceiling.. The tension in the rope is:

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