Question 1

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

Question 2

A man weighing 700 Nb is in an elevator that is accelerating upward at 4 m/s2. The force exerted on him by the elevator floor is:

Accepted Answer

A)  71 N 
B)  290 N 
C)  410 N 
D)  700 N 
E)  990 N 
A)  71 N 
B)  290 N 
C)  410 N 
D)  700 N 
E)  990 N

Question 3

A 9000-N automobile is pushed along a level road by four students who apply a total forward force of 500 N. Neglecting friction, the acceleration of the automobile is:

Accepted Answer

A)  0.055m/s2 
B)  0.54 m/s2 
C)  1.8 m/s2 
D)  9.8 m/s2 
E)  18 m/s2 
A)  0.055m/s2 
B)  0.54 m/s2 
C)  1.8 m/s2 
D)  9.8 m/s2 
E)  18 m/s2

Question 4

In SI units a force is numerically equal to the ______, when the force is applied to it.

Accepted Answer

A)  velocity of the standard kilogram 
B)  speed of the standard kilogram 
C)  velocity of any object 
D)  acceleration of the standard kilogram 
E)  acceleration of any object 
A)  velocity of the standard kilogram 
B)  speed of the standard kilogram 
C)  velocity of any object 
D)  acceleration of the standard kilogram 
E)  acceleration of any object

Question 5

Two forces are applied to a 5.0-kg crate; one is 6.0 N to the north and the other is 8.0 N to the west. The magnitude of the acceleration of the crate is:

Accepted Answer

A)  0.50 m/s2 
B)  2.0 m/s2 
C)  2.8 m/s2 
D)  10 m/s2 
E)  50 m/s2 
A)  0.50 m/s2 
B)  2.0 m/s2 
C)  2.8 m/s2 
D)  10 m/s2 
E)  50 m/s2

Question 6

A block slides down a frictionless plane that makes an angle of 30$\degree$ with the horizontal. The acceleration of the block (in cm/s2) is:

Accepted Answer

A)  980 
B)  566 
C)  849 
D)  zero 
E)  490 
A)  980 
B)  566 
C)  849 
D)  zero 
E)  490

Question 7

The standard 1-kg mass is attached to a compressed spring and the spring is released. If the mass initially has an acceleration of 5.6 m/s2, the force of the spring has a magnitude of:

Accepted Answer

A)  2.8 N 
B)  5.6 N 
C)  11.2 N 
D)  0 
E)  an undetermined amount 
A)  2.8 N 
B)  5.6 N 
C)  11.2 N 
D)  0 
E)  an undetermined amount

Question 8

A 13-N weight and a 12-N weight are connected by a massless string over a massless, frictionless pulley. The 13-N weight has a downward acceleration with magnitude equal to that of a freely falling body times:

Accepted Answer

A)  1 
B)  1/12 
C)  1/13 
D)  1/25 
E)  13/25 
A)  1 
B)  1/12 
C)  1/13 
D)  1/25 
E)  13/25

Question 9

A 1000-kg elevator is rising and its speed is increasing at 3 m/s2. The tension in the elevator cable is:

Accepted Answer

A)  6800 N 
B)  1000 N 
C)  3000 N 
D)  9800 N 
E)  12800 N 
A)  6800 N 
B)  1000 N 
C)  3000 N 
D)  9800 N 
E)  12800 N

Question 10

A 1-N pendulum bob is held at an angle $\theta$from the vertical by a 2-N horizontal force F as shown. The tension in the string supporting the pendulum bob (in newtons) is:

Accepted Answer

A)  cos $\theta$ 
B)  2/cos $\theta$ 
C)    
D)  1 
E)  none of these 
A)  cos $\theta$ 
B)  2/cos $\theta$ 
C)    
D)  1 
E)  none of these

Question 11

An example of an inertial reference frame is:

Accepted Answer

A)  any reference frame that is not accelerating 
B)  a frame attached to a particle on which there are no forces 
C)  any reference frame that is at rest 
D)  a reference frame attached to the center of the universe 
E)  a reference frame attached to the Earth 
A)  any reference frame that is not accelerating 
B)  a frame attached to a particle on which there are no forces 
C)  any reference frame that is at rest 
D)  a reference frame attached to the center of the universe 
E)  a reference frame attached to the Earth

Question 12

The block shown moves with constant velocity on a horizontal surface. Two of the forces on it are shown. A frictional force exerted by the surface is the only other horizontal force on the block. The frictional force is:

Accepted Answer

A)  0 
B)  2 N, leftward 
C)  2 N, rightward 
D)  slightly more than 2 N, leftward 
E)  slightly less than 2 N, leftward 
A)  0 
B)  2 N, leftward 
C)  2 N, rightward 
D)  slightly more than 2 N, leftward 
E)  slightly less than 2 N, leftward

Question 13

A 5-kg block is suspended by a rope from the ceiling of an elevator accelerates downward at 3.0 m/s2. The tension force of the rope on the block is:

Accepted Answer

A)  15 N, up 
B)  34 N, up 
C)  34 N, down 
D)  64 N, up 
E)  64 N, down 
A)  15 N, up 
B)  34 N, up 
C)  34 N, down 
D)  64 N, up 
E)  64 N, down

Question 14

The "reaction" force does not cancel the "action" force because:

Accepted Answer

A)  the action force is greater than the reaction force 
B)  they are on different bodies 
C)  they are in the same direction 
D)  the reaction force exists only after the action force is removed 
E)  the reaction force is greater than the action force 
A)  the action force is greater than the reaction force 
B)  they are on different bodies 
C)  they are in the same direction 
D)  the reaction force exists only after the action force is removed 
E)  the reaction force is greater than the action force

Question 15

A 6-kg object is moving south. A net force of 12 N north on it result in the object having an acceleration of:

Accepted Answer

A)  2 m/s2, north 
B)  2 m/s2, south 
C)  6 m/s2, north 
D)  18 m/s2, north 
E)  18 m/s2, south 
A)  2 m/s2, north 
B)  2 m/s2, south 
C)  6 m/s2, north 
D)  18 m/s2, north 
E)  18 m/s2, south

Question 16

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 17

Two forces, one with a magnitude of 3 N and the other with a magnitude of 5 N, are applied to an object. For which orientations of the forces shown in the diagrams is the magnitude of the acceleration of the object the least?

Accepted Answer

A)  I 
B)  II 
C)  III 
D)  IV 
E)  V 
A)  I 
B)  II 
C)  III 
D)  IV 
E)  V

Question 18

A lead block is suspended from your hand by a string. The reaction to the force of gravity on the block is the force exerted by the:

Accepted Answer

A)  string on the block 
B)  block on the string 
C)  string on the hand 
D)  hand on the string 
E)  block on the Earth 
A)  string on the block 
B)  block on the string 
C)  string on the hand 
D)  hand on the string 
E)  block on the Earth

Question 19

A circus performer of weight W is walking along a "high wire" as shown. The tension in the wire is:

Accepted Answer

A)  approximately W 
B)  approximately W/2 
C)  much less than W 
D)  much more than W 
E)  depends on whether he stands on one or two feet 
A)  approximately W 
B)  approximately W/2 
C)  much less than W 
D)  much more than W 
E)  depends on whether he stands on one or two feet

Question 20

Two objects, one having three times the mass of the other, are dropped from the same height in a vacuum. At the end of their fall, their velocities are equal because:

Accepted Answer

A)  anything falling in vacuum has constant velocity 
B)  all objects reach the same terminal velocity 
C)  the acceleration of the larger object is three times greater than that of the smaller object 
D)  the force of gravity is the same for both objects 
E)  none of the above 
A)  anything falling in vacuum has constant velocity 
B)  all objects reach the same terminal velocity 
C)  the acceleration of the larger object is three times greater than that of the smaller object 
D)  the force of gravity is the same for both objects 
E)  none of the above

Exam 5: Force and Motion I

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

A man weighing 700 Nb is in an elevator that is accelerating upward at 4 m/s2. The force exerted on him by the elevator floor is:

A 9000-N automobile is pushed along a level road by four students who apply a total forward force of 500 N. Neglecting friction, the acceleration of the automobile is:

In SI units a force is numerically equal to the ______, when the force is applied to it.

Two forces are applied to a 5.0-kg crate; one is 6.0 N to the north and the other is 8.0 N to the west. The magnitude of the acceleration of the crate is:

A block slides down a frictionless plane that makes an angle of 30 °\degree° with the horizontal. The acceleration of the block (in cm/s2) is:

The standard 1-kg mass is attached to a compressed spring and the spring is released. If the mass initially has an acceleration of 5.6 m/s2, the force of the spring has a magnitude of:

A 13-N weight and a 12-N weight are connected by a massless string over a massless, frictionless pulley. The 13-N weight has a downward acceleration with magnitude equal to that of a freely falling body times:

A 1000-kg elevator is rising and its speed is increasing at 3 m/s2. The tension in the elevator cable is:

A 1-N pendulum bob is held at an angle θ\thetaθ from the vertical by a 2-N horizontal force F as shown. The tension in the string supporting the pendulum bob (in newtons) is:

An example of an inertial reference frame is:

The block shown moves with constant velocity on a horizontal surface. Two of the forces on it are shown. A frictional force exerted by the surface is the only other horizontal force on the block. The frictional force is:

A 5-kg block is suspended by a rope from the ceiling of an elevator accelerates downward at 3.0 m/s2. The tension force of the rope on the block is:

The "reaction" force does not cancel the "action" force because:

A 6-kg object is moving south. A net force of 12 N north on it result in the object having an acceleration of:

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:

Two forces, one with a magnitude of 3 N and the other with a magnitude of 5 N, are applied to an object. For which orientations of the forces shown in the diagrams is the magnitude of the acceleration of the object the least?

A lead block is suspended from your hand by a string. The reaction to the force of gravity on the block is the force exerted by the:

A circus performer of weight W is walking along a "high wire" as shown. The tension in the wire is:

Two objects, one having three times the mass of the other, are dropped from the same height in a vacuum. At the end of their fall, their velocities are equal because:

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A man weighing 700 Nb is in an elevator that is accelerating upward at 4 m/s². The force exerted on him by the elevator floor is:

A block slides down a frictionless plane that makes an angle of 30 $\degree$ with the horizontal. The acceleration of the block (in cm/s²) is:

The standard 1-kg mass is attached to a compressed spring and the spring is released. If the mass initially has an acceleration of 5.6 m/s², the force of the spring has a magnitude of:

A 1000-kg elevator is rising and its speed is increasing at 3 m/s². The tension in the elevator cable is:

A 5-kg block is suspended by a rope from the ceiling of an elevator accelerates downward at 3.0 m/s². The tension force of the rope on the block is: