Question 1

Batter up! Your bat hits the ball pitched to you with a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose magnitude is

Accepted Answer

A)  somewhat less than 1500 N. 
B)  somewhat greater than 1500 N. 
C)  essentially zero. 
D)  exactly equal to 1500 N. 
A)  somewhat less than 1500 N. 
B)  somewhat greater than 1500 N. 
C)  essentially zero. 
D)  exactly equal to 1500 N. D

Question 2

The moon pulls on the Earth with one-sixth of the force of the Earth exerts on the moon.

Accepted Answer

A) True 
 B)False  False

Question 3

If a force accelerates 4.5 kg at 40.m/ s2, that same force would accelerate 18. kg by how much?

Accepted Answer

A)  0.18 km/ s2 
B)  10. m/ s2 
C)  0.16 km/ s2 
D)  40. m/ s2 
E)  32. ft/ s2 
A)  0.18 km/ s2 
B)  10. m/ s2 
C)  0.16 km/ s2 
D)  40. m/ s2 
E)  32. ft/ s2 B

Question 4

A 42.0 kg block of ice slides down the plane incline 34.0° in Figure 4-12.
Figure 4-12
  
Assuming friction is negligible, what is the acceleration of the block down the incline?

Accepted Answer

A)  2.73 m/ s2 
B)  9.80 m/ s2 
C)  8.12 m/ s2 
D)  6.61 m/ s2 
E)  5.48 m/ s2 
A)  2.73 m/ s2 
B)  9.80 m/ s2 
C)  8.12 m/ s2 
D)  6.61 m/ s2 
E)  5.48 m/ s2

Question 5

If you exert a force F on an object, the force which the object exerts on you will

Accepted Answer

A)  depend on the relative masses of you and the object. 
B)  depend upon your direction of motion. 
C)  depend on whether or not the object is moving. 
D)  depend on whether or not you are moving. 
E)  be F in all cases. 
A)  depend on the relative masses of you and the object. 
B)  depend upon your direction of motion. 
C)  depend on whether or not the object is moving. 
D)  depend on whether or not you are moving. 
E)  be F in all cases.

Question 6

State Newton's 1st law in your own words.

Accepted Answer

In the absence of an unbalance

Question 7

A bulldozer drags a log weighing 500. N along a rough surface. The cable attached to the log makes an angle of 30.° with the ground. The coefficient of static friction between the log and the ground is 0.50. What minimum tension is required in the cable in order for the log to begin to move?

Accepted Answer

The answer of A bulldozer drags a log weighing 500....

Question 8

A 16-kg fish is weighed with two spring scales, each of negligible weight, as shown in Figure 4-2.
 
What will be the readings on the scales?

Accepted Answer

A)  Each scale will read 8 kg. 
B)  The sum of the two readings will be 32 kg. 
C)  The top scale will read 16 kg, and the bottom scale will read zero. 
D)  The bottom scale will read 16 kg, and the top scale will read zero. 
E)  Each scale will show a reading greater than zero and less than 16 kg, but the sum of the two readings will be 16 kg. 
A)  Each scale will read 8 kg. 
B)  The sum of the two readings will be 32 kg. 
C)  The top scale will read 16 kg, and the bottom scale will read zero. 
D)  The bottom scale will read 16 kg, and the top scale will read zero. 
E)  Each scale will show a reading greater than zero and less than 16 kg, but the sum of the two readings will be 16 kg.

Question 9

Florence, who weighs 120 lb, stands on a bathroom scale in an elevator. What will she see the scale read when the elevator is accelerating upward at 2.0 m/s2?

Accepted Answer

A)  1.2 × 102 lb 
B)  96 lb 
C)  1.6 × 102 lb 
D)  1.4 × 102 lb 
E)  86 lb 
A)  1.2 × 102 lb 
B)  96 lb 
C)  1.6 × 102 lb 
D)  1.4 × 102 lb 
E)  86 lb

Question 10

To push a piece of heavy furniture across the carpet usually takes more force to get it moving than it takes to keep is moving. This is because

Accepted Answer

A)  of Newton's first law. 
B)  of Newton's third law. 
C)  the static coefficient of friction is larger than the kinetic coefficient. 
D)  the kinetic coefficient of friction is larger than the static coefficient. 
E)  of Newton's second law. 
A)  of Newton's first law. 
B)  of Newton's third law. 
C)  the static coefficient of friction is larger than the kinetic coefficient. 
D)  the kinetic coefficient of friction is larger than the static coefficient. 
E)  of Newton's second law.

Question 11

Suppose several forces are acting upon a mass m. The   in   = m   refers to

Accepted Answer

A)  any particular one of the forces. 
B)  the arithmetic sum of all the forces. 
C)  the force of friction acting upon the mass. 
D)  the arithmetic mean of all the forces. 
E)  the vector sum of all the forces. 
A)  any particular one of the forces. 
B)  the arithmetic sum of all the forces. 
C)  the force of friction acting upon the mass. 
D)  the arithmetic mean of all the forces. 
E)  the vector sum of all the forces.

Question 12

Florence, who weighs 120. lbs, stands on a bathroom scale in an elevator. What will the scale read when the elevator is accelerating downward at 2.0 m/ s2?

Accepted Answer

A)  1.2 × 102 lb 
B)  96. lb 
C)  1.56 × 102 lb 
D)  86. lb 
E)  1.4 × 102 lb 
A)  1.2 × 102 lb 
B)  96. lb 
C)  1.56 × 102 lb 
D)  86. lb 
E)  1.4 × 102 lb

Question 13

An object is dropped from a helicopter. When it reaches terminal velocity

Accepted Answer

A)  the acceleration finally reaches g. 
B)  the acceleration of gravity, g, becomes 0. 
C)  gravity no longer acts upon it. 
D)  the total force is zero. 
E)  all of the upward forces add up to zero. 
A)  the acceleration finally reaches g. 
B)  the acceleration of gravity, g, becomes 0. 
C)  gravity no longer acts upon it. 
D)  the total force is zero. 
E)  all of the upward forces add up to zero.

Question 14

Two identical masses are attached by a light string that passes over a small pulley, as shown in Figure 4-3.
 
The table and the pulley are frictionless. The masses are moving

Accepted Answer

A)  with an acceleration greater than g. 
B)  with an acceleration less than g. 
C)  with an acceleration equal to g. 
D)  at constant speed. 
A)  with an acceleration greater than g. 
B)  with an acceleration less than g. 
C)  with an acceleration equal to g. 
D)  at constant speed.

Question 15

You are standing in a moving bus, and you suddenly fall backward. You can imply from this that the bus's

Accepted Answer

A)  speed remained the same, but it's turning to the right. 
B)  velocity decreased. 
C)  the bus stopped. 
D)  speed remained the same, but it's turning to the left. 
E)  velocity increased. 
A)  speed remained the same, but it's turning to the right. 
B)  velocity decreased. 
C)  the bus stopped. 
D)  speed remained the same, but it's turning to the left. 
E)  velocity increased.

Question 16

When you sit on a chair, the reaction to your weight is

Accepted Answer

A)  zero if in equilibrium. 
B)  the Earth being pulled up. 
C)  the floor pushing up on the chair. 
D)  the chair pushing on you. 
E)  your push down on the chair. 
A)  zero if in equilibrium. 
B)  the Earth being pulled up. 
C)  the floor pushing up on the chair. 
D)  the chair pushing on you. 
E)  your push down on the chair.

Question 17

An antitank weapon fires a 3.0 kg rocket which acquires a speed of 50. m/s after traveling 90. cm down a launching tube. Assuming the rocket was accelerated uniformly, what force acted on it?

Accepted Answer

A)  5.8 kN 
B)  3.6 kN 
C)  2.8 kN 
D)  2.0 kN 
E)  4.2 kN 
A)  5.8 kN 
B)  3.6 kN 
C)  2.8 kN 
D)  2.0 kN 
E)  4.2 kN

Question 18

A child's toy is suspended from the ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8 N. If this is the "action force," what is the "reaction force"?

Accepted Answer

A)  the string pulling downward on the ceiling with an 8-N force 
B)  the toy pushing downward on the Earth with an 8-N force 
C)  the ceiling pulling upward on the string with an 8-N force 
D)  the toy pulling upward on the Earth with an 8-N force 
E)  the string pulling upward on the toy with an 8-N force 
A)  the string pulling downward on the ceiling with an 8-N force 
B)  the toy pushing downward on the Earth with an 8-N force 
C)  the ceiling pulling upward on the string with an 8-N force 
D)  the toy pulling upward on the Earth with an 8-N force 
E)  the string pulling upward on the toy with an 8-N force

Question 19

The MKS unit of force is a ________, the CGS force unit is a ________, and the English unit for force is a ________.

Accepted Answer

The answer of The MKS unit of force is a...

Question 20

Three blocks are pulled by a force f of 16.5 Newtons along a frictionless surface, as shown in Figure 4-8.
 
 What is the acceleration of the system and the tension in the string between m2 and m3? (m1= 3.3 kg, m2= 1.1 kg, and = 2.2 kg)

Accepted Answer

2.5 m/ s<s

Exam 4: Force and Motion

Batter up! Your bat hits the ball pitched to you with a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose magnitude is

The moon pulls on the Earth with one-sixth of the force of the Earth exerts on the moon.

If a force accelerates 4.5 kg at 40.m/ s2, that same force would accelerate 18. kg by how much?

A 42.0 kg block of ice slides down the plane incline 34.0° in Figure 4-12. Figure 4-12 Assuming friction is negligible, what is the acceleration of the block down the incline?

If you exert a force F on an object, the force which the object exerts on you will

State Newton's 1st law in your own words.

A bulldozer drags a log weighing 500. N along a rough surface. The cable attached to the log makes an angle of 30.° with the ground. The coefficient of static friction between the log and the ground is 0.50. What minimum tension is required in the cable in order for the log to begin to move?

A 16-kg fish is weighed with two spring scales, each of negligible weight, as shown in Figure 4-2. What will be the readings on the scales?

Florence, who weighs 120 lb, stands on a bathroom scale in an elevator. What will she see the scale read when the elevator is accelerating upward at 2.0 m/s2?

To push a piece of heavy furniture across the carpet usually takes more force to get it moving than it takes to keep is moving. This is because

Suppose several forces are acting upon a mass m. The in 11eea3d1_0523_35d0_97f4_25e760fe0416_TB9720_11 = m refers to

Florence, who weighs 120. lbs, stands on a bathroom scale in an elevator. What will the scale read when the elevator is accelerating downward at 2.0 m/ s2?

An object is dropped from a helicopter. When it reaches terminal velocity

Two identical masses are attached by a light string that passes over a small pulley, as shown in Figure 4-3. The table and the pulley are frictionless. The masses are moving

You are standing in a moving bus, and you suddenly fall backward. You can imply from this that the bus's

When you sit on a chair, the reaction to your weight is

An antitank weapon fires a 3.0 kg rocket which acquires a speed of 50. m/s after traveling 90. cm down a launching tube. Assuming the rocket was accelerated uniformly, what force acted on it?

A child's toy is suspended from the ceiling by means of a string. The Earth pulls downward on the toy with its weight force of 8 N. If this is the "action force," what is the "reaction force"?

The MKS unit of force is a ________, the CGS force unit is a ________, and the English unit for force is a ________.

Three blocks are pulled by a force f of 16.5 Newtons along a frictionless surface, as shown in Figure 4-8. What is the acceleration of the system and the tension in the string between m2 and m3? (m1= 3.3 kg, m2= 1.1 kg, and = 2.2 kg)

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Filters

If a force accelerates 4.5 kg at 40.m/ s², that same force would accelerate 18. kg by how much?

Florence, who weighs 120 lb, stands on a bathroom scale in an elevator. What will she see the scale read when the elevator is accelerating upward at 2.0 m/s²?

Florence, who weighs 120. lbs, stands on a bathroom scale in an elevator. What will the scale read when the elevator is accelerating downward at 2.0 m/ s²?

The MKS unit of force is a , the CGS force unit is a , and the English unit for force is a .

Three blocks are pulled by a force f of 16.5 Newtons along a frictionless surface, as shown in Figure 4-8. What is the acceleration of the system and the tension in the string between m₂ and m₃? (m₁= 3.3 kg, m₂= 1.1 kg, and = 2.2 kg)