Question 1

A crane operator lowers a 16,000 N steel ball with a downward acceleration of 3 m/s2. The tension in the cable is:

Accepted Answer

A)  4900 N 
B)  11,000 N 
C)  16,000 N 
D)  21,000 N 
E)  48,000 N 
A)  4900 N 
B)  11,000 N 
C)  16,000 N 
D)  21,000 N 
E)  48,000 N B

Question 2

When a certain force is applied to the 1-kg standard mass its acceleration is 5.0 m/s2. When the same force is applied to another object its acceleration is one-fifth as much. The mass of the object is:

Accepted Answer

A)  0.2 kg 
B)  0.5 kg 
C)  1.0 kg 
D)  5.0 kg 
E)  10 kg 
A)  0.2 kg 
B)  0.5 kg 
C)  1.0 kg 
D)  5.0 kg 
E)  10 kg D

Question 3

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$\degree$ above the horizontal the magnitude of the normal force of the incline on the crate 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 E

Question 4

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 5

A short 10-g string is used to pull a 50-g toy across a frictionless horizontal surface. If a 3.0 *10-2 N force is applied horizontally to the free end of the string, the force of the string on the toy, at the other end, is:

Accepted Answer

A)  0.15 N 
B)  6.0 * 10-3 N 
C)  2.5*10-2 N 
D)  3.0 * 10-2 N 
E)  3.5 *10-2 N 
A)  0.15 N 
B)  6.0 * 10-3 N 
C)  2.5*10-2 N 
D)  3.0 * 10-2 N 
E)  3.5 *10-2 N

Question 6

A 90-kg man stands in an elevator that has a downward acceleration of 1.4 m/s2. The force exerted by him on the floor is about:

Accepted Answer

A)  0 N 
B)  90 N 
C)  760 N 
D)  880 N 
E)  1010 N 
A)  0 N 
B)  90 N 
C)  760 N 
D)  880 N 
E)  1010 N

Question 7

The mass of a body:

Accepted Answer

A)  is slightly different at different places on the Earth 
B)  is a vector 
C)  is independent of the acceleration due to gravity 
D)  is the same for all bodies of the same volume 
E)  can be measured most accurately on a spring scale 
A)  is slightly different at different places on the Earth 
B)  is a vector 
C)  is independent of the acceleration due to gravity 
D)  is the same for all bodies of the same volume 
E)  can be measured most accurately on a spring scale

Question 8

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 9

A car drives in a straight line on a level road with a constant acceleration of 3 m/s2. A ball is suspended by a string from the ceiling of the car; the ball does not swing, being at rest with respect to the car. What angle does the string make with the vertical?

Accepted Answer

A)  17$\degree$ 
B)  35$\degree$ 
C)  52$\degree$ 
D)  73$\degree$ 
E)  Cannot be found without knowing the length of the string 
A)  17$\degree$ 
B)  35$\degree$ 
C)  52$\degree$ 
D)  73$\degree$ 
E)  Cannot be found without knowing the length of the string

Question 10

When a 25-kg crate is pushed across a frictionless horizontal floor with a force of 200 N, directed 20$\degree$ below the horizontal, the magnitude of the normal force of the floor on the crate is:

Accepted Answer

A)  25 N 
B)  68 N 
C)  180 N 
D)  250 N 
E)  310 N 
A)  25 N 
B)  68 N 
C)  180 N 
D)  250 N 
E)  310 N

Question 11

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 12

A 25-kg crate is pushed across a frictionless horizontal floor with a force of 20 N, directed 20$\degree$ below the horizontal. The acceleration of the crate is:

Accepted Answer

A)  0.27 m/s2 
B)  0.75 m/s2 
C)  0.80 m/s2 
D)  170 m/s2 
E)  470 m/s2 
A)  0.27 m/s2 
B)  0.75 m/s2 
C)  0.80 m/s2 
D)  170 m/s2 
E)  470 m/s2

Question 13

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 14

Mass differs from weight in that:

Accepted Answer

A)  all objects have weight but some lack mass 
B)  weight is a force and mass is not 
C)  the mass of an object is always more than its weight 
D)  mass can only be expressed in the metric system 
E)  there is no difference 
A)  all objects have weight but some lack mass 
B)  weight is a force and mass is not 
C)  the mass of an object is always more than its weight 
D)  mass can only be expressed in the metric system 
E)  there is no difference

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 1100-kg elevator is rising and its speed is increasing at 3.0 m/s2. The tension in the elevator cable is:

Accepted Answer

A)  7500 N 
B)  1100 N 
C)  3300 N 
D)  11000 N 
E)  14000 N 
A)  7500 N 
B)  1100 N 
C)  3300 N 
D)  11000 N 
E)  14000 N

Question 17

A box is on a scale. In which of these situations will the scale reading NOT equal the weight of the box?

Accepted Answer

A)  The scale and box are in an airplane flying at constant speed. 
B)  The scale and box are in an elevator rising at constant speed. 
C)  The scale and box are in a hot air balloon in level flight. 
D)  The scale and box are on a steep slope, held in place by friction. 
E)  The scale and box are on Mars. 
A)  The scale and box are in an airplane flying at constant speed. 
B)  The scale and box are in an elevator rising at constant speed. 
C)  The scale and box are in a hot air balloon in level flight. 
D)  The scale and box are on a steep slope, held in place by friction. 
E)  The scale and box are on Mars.

Question 18

A man weighing 700 N 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 19

In general, any surface exerts two forces on objects that are in contact with it. One force is parallel to the surface and the other is perpendicular to the surface. What are these forces called?

Accepted Answer

A)  The parallel force is surface tension and the perpendicular force is friction. 
B)  The parallel force is the normal force and the perpendicular force is friction. 
C)  The parallel force is friction and the perpendicular force is surface tension. 
D)  The parallel force is friction and the perpendicular force is the normal force. 
E)  The parallel force is static friction and the perpendicular force is kinetic friction. 
A)  The parallel force is surface tension and the perpendicular force is friction. 
B)  The parallel force is the normal force and the perpendicular force is friction. 
C)  The parallel force is friction and the perpendicular force is surface tension. 
D)  The parallel force is friction and the perpendicular force is the normal force. 
E)  The parallel force is static friction and the perpendicular force is kinetic friction.

Question 20

A 25-N crate slides down a frictionless incline that is 25$\degree$ above the horizontal. The magnitude of the normal force of the incline on the crate is:

Accepted Answer

A)  11 N 
B)  23 N 
C)  25 N 
D)  100 N 
E)  220 N 
A)  11 N 
B)  23 N 
C)  25 N 
D)  100 N 
E)  220 N

Exam 5: Force and Motion I

A crane operator lowers a 16,000 N steel ball with a downward acceleration of 3 m/s2. The tension in the cable is:

When a certain force is applied to the 1-kg standard mass its acceleration is 5.0 m/s2. When the same force is applied to another object its acceleration is one-fifth as much. The mass of the object 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 °\degree° above the horizontal the magnitude of the normal force of the incline on the crate 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:

A short 10-g string is used to pull a 50-g toy across a frictionless horizontal surface. If a 3.0 *10-2 N force is applied horizontally to the free end of the string, the force of the string on the toy, at the other end, is:

A 90-kg man stands in an elevator that has a downward acceleration of 1.4 m/s2. The force exerted by him on the floor is about:

The mass of a body:

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:

A car drives in a straight line on a level road with a constant acceleration of 3 m/s2. A ball is suspended by a string from the ceiling of the car; the ball does not swing, being at rest with respect to the car. What angle does the string make with the vertical?

When a 25-kg crate is pushed across a frictionless horizontal floor with a force of 200 N, directed 20 °\degree° below the horizontal, the magnitude of the normal force of the floor on the crate is:

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

A 25-kg crate is pushed across a frictionless horizontal floor with a force of 20 N, directed 20 °\degree° below the horizontal. The acceleration of the crate is:

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:

Mass differs from weight in that:

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 1100-kg elevator is rising and its speed is increasing at 3.0 m/s2. The tension in the elevator cable is:

A box is on a scale. In which of these situations will the scale reading NOT equal the weight of the box?

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

In general, any surface exerts two forces on objects that are in contact with it. One force is parallel to the surface and the other is perpendicular to the surface. What are these forces called?

A 25-N crate slides down a frictionless incline that is 25 °\degree° above the horizontal. The magnitude of the normal force of the incline on the crate is:

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A crane operator lowers a 16,000 N steel ball with a downward acceleration of 3 m/s². The tension in the cable is:

When a certain force is applied to the 1-kg standard mass its acceleration is 5.0 m/s². When the same force is applied to another object its acceleration is one-fifth as much. The mass of the object 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 $\degree$ above the horizontal the magnitude of the normal force of the incline on the crate is:

A short 10-g string is used to pull a 50-g toy across a frictionless horizontal surface. If a 3.0 *10^-2 N force is applied horizontally to the free end of the string, the force of the string on the toy, at the other end, is:

A 90-kg man stands in an elevator that has a downward acceleration of 1.4 m/s². The force exerted by him on the floor is about:

A car drives in a straight line on a level road with a constant acceleration of 3 m/s². A ball is suspended by a string from the ceiling of the car; the ball does not swing, being at rest with respect to the car. What angle does the string make with the vertical?

When a 25-kg crate is pushed across a frictionless horizontal floor with a force of 200 N, directed 20 $\degree$ below the horizontal, the magnitude of the normal force of the floor on the crate is:

A 25-kg crate is pushed across a frictionless horizontal floor with a force of 20 N, directed 20 $\degree$ below the horizontal. The acceleration of the crate is:

A 1100-kg elevator is rising and its speed is increasing at 3.0 m/s². The tension in the elevator cable is:

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

A 25-N crate slides down a frictionless incline that is 25 $\degree$ above the horizontal. The magnitude of the normal force of the incline on the crate is: