Question 1

A force accelerates a body of mass M.A second body requires twice as much force to produce the same acceleration.What is the mass of the second body?

Accepted Answer

A) M 
B) 2M 
C) M/2 
D) 4M 
E) M/4 
A) M 
B) 2M 
C) M/2 
D) 4M 
E) M/4

Question 2

A net force is exerted on an object toward the north.The object

Accepted Answer

A) is moving toward the north. 
B) is moving toward the east. 
C) is moving toward the west. 
D) is moving toward the south. 
E) may be moving in any direction. 
A) is moving toward the north. 
B) is moving toward the east. 
C) is moving toward the west. 
D) is moving toward the south. 
E) may be moving in any direction.

Question 3

You want to elope by sliding down a nylon rope made by tying stockings together.The rope will withstand a maximum tension of 300 N without breaking.Your mass is 61.2 kg.The magnitude of the smallest acceleration a with which you can slide down the rope is

Accepted Answer

A) 9.81 m/s2  
B) 4.91 m/s2  
C) zero 
D) 2.40 m/s2  
E) 19.6 m/s2  
A) 9.81 m/s2  
B) 4.91 m/s2  
C) zero 
D) 2.40 m/s2  
E) 19.6 m/s2

Question 4

The weight of an object is

Accepted Answer

A) the same as the mass of the object. 
B) the quantity of matter in the object. 
C) the mass of the object multiplied by the acceleration due to gravity at sea level,regardless of where the object is located. 
D) the result of the gravitational force acting on the object. 
E) the reading on a spring scale attached to the object. 
A) the same as the mass of the object. 
B) the quantity of matter in the object. 
C) the mass of the object multiplied by the acceleration due to gravity at sea level,regardless of where the object is located. 
D) the result of the gravitational force acting on the object. 
E) the reading on a spring scale attached to the object.

Question 5

Which of the following statements includes all the essential elements of Newton's first law?

Accepted Answer

A) A body at rest persists in its state of rest unless acted on by a non-zero net external force. 
B) A body persists in its state of rest or of uniform motion in a straight line as long as the net external force remains constant. 
C) For every action there is an equal and opposite reaction. 
D) A body persists in its state of rest or of uniform motion in a straight line unless acted on by a non-zero net external force. 
E) The acceleration of a body is proportional to the net external force acting on it and to the mass of the body. 
A) A body at rest persists in its state of rest unless acted on by a non-zero net external force. 
B) A body persists in its state of rest or of uniform motion in a straight line as long as the net external force remains constant. 
C) For every action there is an equal and opposite reaction. 
D) A body persists in its state of rest or of uniform motion in a straight line unless acted on by a non-zero net external force. 
E) The acceleration of a body is proportional to the net external force acting on it and to the mass of the body.

Question 6

A force of F = 90 N is exerted on mass m1 as shown.Both m1 and m2 accelerate to the right at 3 m/s2 along the frictionless surface.The force F makes an angle of 25 degrees to the horizontal.Calculate the force that the horizontal surface exerts on mass m1.(m2 = 10 kg)

Accepted Answer

A) 2.5 $\times$ 102 N 
B) 1.5 $\times$ 102 N 
C) 82 N 
D) 3.5 $\times$ 102 N 
E) 2.1 $\times$ 102 N 
A) 2.5 $\times$ 102 N 
B) 1.5 $\times$ 102 N 
C) 82 N 
D) 3.5 $\times$ 102 N 
E) 2.1 $\times$ 102 N

Question 7

A person of weight w is in an upward-moving elevator when the cable suddenly breaks.What is the person's apparent weight immediately after the elevator starts to fall?

Accepted Answer

A) w 
B) greater than w 
C) less than w 
D) 9.81w 
E) zero 
A) w 
B) greater than w 
C) less than w 
D) 9.81w 
E) zero

Question 8

A horse-drawn coach is decelerating at 3.0 m/s2 while moving in a straight line horizontally.A 350-g mass is hanging on a string 1.6 m long from the ceiling of the coach.The angle that the string makes with the vertical is

Accepted Answer

A) 9.3º toward the front of the coach. 
B) 17º toward the front of the coach. 
C) 9.3º toward the back of the coach. 
D) 2.5º toward the front of the coach. 
E) 0º,or straight down. 
A) 9.3º toward the front of the coach. 
B) 17º toward the front of the coach. 
C) 9.3º toward the back of the coach. 
D) 2.5º toward the front of the coach. 
E) 0º,or straight down.

Question 9

The diagrams below show the application of a force F on a block of mass m.   Which diagram(s)produces the largest acceleration on the block in the horizontal direction?

Accepted Answer

A) (1)and (3) 
B) (2) 
C) (3) 
D) (2)and (4) 
E) The acceleration is the same for all four. 
A) (1)and (3) 
B) (2) 
C) (3) 
D) (2)and (4) 
E) The acceleration is the same for all four.

Question 10

According to Newton's law of inertia,

Accepted Answer

A) objects moving with an initial speed relative to a given frame of reference eventually come to rest relative to the reference frame. 
B) whether an object is at rest or is moving with constant velocity depends on the inertial reference frame in which the object is observed. 
C) rest is the most natural state of motion. 
D) an object at rest in a given frame of reference eventually finds itself in motion relative to the frame of reference. 
E) forces always exist in pairs. 
A) objects moving with an initial speed relative to a given frame of reference eventually come to rest relative to the reference frame. 
B) whether an object is at rest or is moving with constant velocity depends on the inertial reference frame in which the object is observed. 
C) rest is the most natural state of motion. 
D) an object at rest in a given frame of reference eventually finds itself in motion relative to the frame of reference. 
E) forces always exist in pairs.

Question 11

Which of the following is not a unit of mass?

Accepted Answer

A) pound 
B) kilogram 
C) gram 
D) slug 
E) milligram 
A) pound 
B) kilogram 
C) gram 
D) slug 
E) milligram

Question 12

If two metal blocks of different masses slide freely down the same frictionless incline,which one of the following is true?

Accepted Answer

A) They have equal accelerations 
B) They have unequal accelerations,but the forces acting on them are equal. 
C) The more massive block reaches the bottom first. 
D) The less massive block reaches the bottom first. 
E) None of these is correct. 
A) They have equal accelerations 
B) They have unequal accelerations,but the forces acting on them are equal. 
C) The more massive block reaches the bottom first. 
D) The less massive block reaches the bottom first. 
E) None of these is correct.

Question 13

A frictionless pulley of negligible mass is hung from the ceiling using a rope,also of negligible mass.Two masses,m1 and m2 (m1 2)are connected to the rope over the pulley.The masses are free to drop.The magnitude of the tension Ttop is ____ the sum of the weights W1 = m1g and W2 = m2g.

Accepted Answer

A) less than 
B) equal to 
C) greater than 
D) unable to tell 
E) depends on T1 and T2. 
A) less than 
B) equal to 
C) greater than 
D) unable to tell 
E) depends on T1 and T2.

Question 14

A lamp of mass m hangs from a spring scale which is attached to the ceiling of an elevator.When the elevator is stopped at the fortieth floor,the scale reads mg.What does it read as the elevator slows down to stop at the ground floor?

Accepted Answer

A) more than mg 
B) less than mg 
C) mg 
D) zero 
E) One cannot tell without knowing how fast the elevator is stopping. 
A) more than mg 
B) less than mg 
C) mg 
D) zero 
E) One cannot tell without knowing how fast the elevator is stopping.

Question 15

The figure below shows two forces,FS1U1B11 and FS1U1B12,acting on an object.   Use the vector diagrams to answer the question.  
-A third force is applied on the object so that the net force on the object is zero.Which force vector best represents the third force?

Accepted Answer

A) (1) 
B) (2) 
C) (3) 
D) (4) 
E) none of the vectors 
A) (1) 
B) (2) 
C) (3) 
D) (4) 
E) none of the vectors

Question 16

A lamp with a mass m is suspended from the ceiling by two cords as shown.The ratio of the magnitude of the vertical component of the tension in   2 to that in   3 is

Accepted Answer

A) 1:1 
B) 1:2 
C)    
D) 3:2 
E) 3:1 
A) 1:1 
B) 1:2 
C)    
D) 3:2 
E) 3:1

Question 17

A physical quantity that is sometimes described as the measure of the resistance of a body to a change in motion is

Accepted Answer

A) force 
B) mass 
C) acceleration 
D) weight 
E) friction 
A) force 
B) mass 
C) acceleration 
D) weight 
E) friction

Question 18

A frictionless pulley of negligible mass is hung from the ceiling using a rope,also of negligible mass.Two masses,m1 and m2 (m1 2)are connected to the rope over the pulley.The masses are free to drop.The magnitude of the tension Ttop is ____ the sum of the tensions T1 and T2.

Accepted Answer

A) less than 
B) equal to 
C) greater than 
D) unable to tell 
E) depends on Ttop 
A) less than 
B) equal to 
C) greater than 
D) unable to tell 
E) depends on Ttop

Question 19

The force needed to accelerate "Opportunity" (Opportunity is a Mars rover)on Mars at 1 m/s2 in the horizontal direction is ____ the force needed to accelerate the rover while it was undergoing testing on Earth.

Accepted Answer

A) less than 
B) equal to 
C) greater than 
D) unable to tell 
E) depends on what g is on Mars 
A) less than 
B) equal to 
C) greater than 
D) unable to tell 
E) depends on what g is on Mars

Question 20

Two groups of five men each are engaged in a tug-of-war,each man pulling with a force of 900 N.If the rope does not move,the tension in it is

Accepted Answer

A) 18 kN 
B) 9.0 kN 
C) 44 kN 
D) 4.5 kN 
E) 0.46 kN 
A) 18 kN 
B) 9.0 kN 
C) 44 kN 
D) 4.5 kN 
E) 0.46 kN

Exam 4: Newtons Laws

A force accelerates a body of mass M.A second body requires twice as much force to produce the same acceleration.What is the mass of the second body?

A net force is exerted on an object toward the north.The object

You want to elope by sliding down a nylon rope made by tying stockings together.The rope will withstand a maximum tension of 300 N without breaking.Your mass is 61.2 kg.The magnitude of the smallest acceleration a with which you can slide down the rope is

The weight of an object is

Which of the following statements includes all the essential elements of Newton's first law?

A force of F = 90 N is exerted on mass m1 as shown.Both m1 and m2 accelerate to the right at 3 m/s2 along the frictionless surface.The force F makes an angle of 25 degrees to the horizontal.Calculate the force that the horizontal surface exerts on mass m1.(m2 = 10 kg)

A person of weight w is in an upward-moving elevator when the cable suddenly breaks.What is the person's apparent weight immediately after the elevator starts to fall?

A horse-drawn coach is decelerating at 3.0 m/s2 while moving in a straight line horizontally.A 350-g mass is hanging on a string 1.6 m long from the ceiling of the coach.The angle that the string makes with the vertical is

The diagrams below show the application of a force F on a block of mass m. Which diagram(s)produces the largest acceleration on the block in the horizontal direction?

According to Newton's law of inertia,

Which of the following is not a unit of mass?

If two metal blocks of different masses slide freely down the same frictionless incline,which one of the following is true?

A frictionless pulley of negligible mass is hung from the ceiling using a rope,also of negligible mass.Two masses,m1 and m2 (m1 < m2)are connected to the rope over the pulley.The masses are free to drop.The magnitude of the tension Ttop is ____ the sum of the weights W1 = m1g and W2 = m2g.

A lamp of mass m hangs from a spring scale which is attached to the ceiling of an elevator.When the elevator is stopped at the fortieth floor,the scale reads mg.What does it read as the elevator slows down to stop at the ground floor?

The figure below shows two forces,F1< / sub> and F2< / sub>,acting on an object. Use the vector diagrams to answer the question. -A third force is applied on the object so that the net force on the object is zero.Which force vector best represents the third force?

A lamp with a mass m is suspended from the ceiling by two cords as shown.The ratio of the magnitude of the vertical component of the tension in 2 to that in 3 is

A physical quantity that is sometimes described as the measure of the resistance of a body to a change in motion is

A frictionless pulley of negligible mass is hung from the ceiling using a rope,also of negligible mass.Two masses,m1 and m2 (m1 < m2)are connected to the rope over the pulley.The masses are free to drop.The magnitude of the tension Ttop is ____ the sum of the tensions T1 and T2.

The force needed to accelerate "Opportunity" (Opportunity is a Mars rover)on Mars at 1 m/s2 in the horizontal direction is ____ the force needed to accelerate the rover while it was undergoing testing on Earth.

Two groups of five men each are engaged in a tug-of-war,each man pulling with a force of 900 N.If the rope does not move,the tension in it is

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Applications of Newtons Laws

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A force of F = 90 N is exerted on mass m₁ as shown.Both m₁ and m₂ accelerate to the right at 3 m/s² along the frictionless surface.The force F makes an angle of 25 degrees to the horizontal.Calculate the force that the horizontal surface exerts on mass m₁.(m₂ = 10 kg)

A horse-drawn coach is decelerating at 3.0 m/s² while moving in a straight line horizontally.A 350-g mass is hanging on a string 1.6 m long from the ceiling of the coach.The angle that the string makes with the vertical is

The figure below shows two forces,F_{1< / sub> and F_{2< / sub>,acting on an object. Use the vector diagrams to answer the question.
-A third force is applied on the object so that the net force on the object is zero.Which force vector best represents the third force?}}

A lamp with a mass m is suspended from the ceiling by two cords as shown.The ratio of the magnitude of the vertical component of the tension in ₂ to that in ₃ is

A frictionless pulley of negligible mass is hung from the ceiling using a rope,also of negligible mass.Two masses,m₁ and m₂ (m₁ < m₂)are connected to the rope over the pulley.The masses are free to drop.The magnitude of the tension T_top is ____ the sum of the tensions T₁ and T₂.

The force needed to accelerate "Opportunity" (Opportunity is a Mars rover)on Mars at 1 m/s² in the horizontal direction is ____ the force needed to accelerate the rover while it was undergoing testing on Earth.