Question 1

Two pieces of kryptonite, #1 and #2, have identical masses, but the net force applied to #1 is 400 N and to #2 is 20 N. The acceleration

Accepted Answer

A)  of #1 is larger. 
B)  of each piece of kryptonite is the same. 
C)  of #2 is larger. 
D)  depends on the weight of each piece of kryptonite. 
A)  of #1 is larger. 
B)  of each piece of kryptonite is the same. 
C)  of #2 is larger. 
D)  depends on the weight of each piece of kryptonite. A

Question 2

The surface gravity of Mars is 3.7 m/s2. If a person with mass of 100 kg were parachuting on Mars, what would be the force exerted by air resistance at terminal velocity?

Accepted Answer

A)  980 N 
B)  490 N 
C)  370 N 
D)  100 N 
A)  980 N 
B)  490 N 
C)  370 N 
D)  100 N C

Question 3

A 10-pound sack of potatoes falls from an airplane. As the velocity of the falling sack increases, so does the air resistance on it. When the air resistance equals 10 pounds, the acceleration of the sack will be

Accepted Answer

A)  100 ft/s2. 
B)  9.8 m/s. 
C)  9.8 m/s2. 
D)  zero. 
A)  100 ft/s2. 
B)  9.8 m/s. 
C)  9.8 m/s2. 
D)  zero. D

Question 4

You stand on a scale to measure your weight. The reaction to the force the Earth exerts on you is

Accepted Answer

A)  the force the scale exerts on you. 
B)  the force the Earth exerts on the scale. 
C)  the force you exert on the scale. 
D)  the force the scale exerts on the Earth. 
E)  the force you exert on the Earth. 
A)  the force the scale exerts on you. 
B)  the force the Earth exerts on the scale. 
C)  the force you exert on the scale. 
D)  the force the scale exerts on the Earth. 
E)  the force you exert on the Earth.

Question 5

A certain force causes a 50 kg person to accelerate at 1.0 m/s2. The same force applied to a 75-kg person would cause

Accepted Answer

A)  a greater acceleration. 
B)  the same acceleration. 
C)  a smaller acceleration. 
A)  a greater acceleration. 
B)  the same acceleration. 
C)  a smaller acceleration.

Question 6

The acceleration of gravity on the Moon's surface is about 1/6 of that on the Earth's surface. An object on the Earth is to be taken to the Moon. We can state that, compared to the Earth,

Accepted Answer

A)  the object's mass and weight will be the same on the Moon. 
B)  the object's mass will be the same but the weight will be less on the Moon. 
C)  the object's mass will be less but the weight will be the same on the Moon. 
D)  the object's mass and weight will be less on the Moon. 
A)  the object's mass and weight will be the same on the Moon. 
B)  the object's mass will be the same but the weight will be less on the Moon. 
C)  the object's mass will be less but the weight will be the same on the Moon. 
D)  the object's mass and weight will be less on the Moon.

Question 7

Three forces act on the object in the sketch. In what direction will the object move?

Accepted Answer

A)  Upward 
B)  To the left 
C)  To the left and up 
D)  To the right 
E)  To the right and up 
A)  Upward 
B)  To the left 
C)  To the left and up 
D)  To the right 
E)  To the right and up

Question 8

A body sliding on a table is observed to gradually slow down. The correct statement is that the body slows down because

Accepted Answer

A)  no force acts on the body. 
B)  no net force acts on the body. 
C)  it is the nature of the body to slow down by itself. 
D)  a net force acts on the body. 
A)  no force acts on the body. 
B)  no net force acts on the body. 
C)  it is the nature of the body to slow down by itself. 
D)  a net force acts on the body.

Question 9

A child, whose weight is 150 newtons, lifts a pumpkin from the ground with a force of 50 newtons. The force the pumpkin exerts on the child is

Accepted Answer

A)  more than 50 newtons. 
B)  50 newtons. 
C)  greater than zero but less than 50 newtons. 
D)  zero. 
A)  more than 50 newtons. 
B)  50 newtons. 
C)  greater than zero but less than 50 newtons. 
D)  zero.

Question 10

The net force acting on a body gives the direction of the ________________ of the body.

Accepted Answer

The answer of The net force acting on a body...

Question 11

A blob of green cheese at the Cheese Institute on the Earth has a mass of 8.1 kg. The same cheese blob in outer space will have a mass of ____________ kg.

Accepted Answer

The answer of A blob of green cheese at the...

Question 12

A parachutist jumping from an airplane reaches a terminal velocity when the force of air resistance is 980 N. The mass of the parachutist is

Accepted Answer

A)  220 lb. 
B)  980 lb. 
C)  980 kg. 
D)  100 lb. 
E)  100 kg. 
A)  220 lb. 
B)  980 lb. 
C)  980 kg. 
D)  100 lb. 
E)  100 kg.

Question 13

A father and his young daughter are on very clean ice, so there is very little friction (the father has more mass than the daughter). The father pushes his daughter forward and she slides away at a speed of 3 m/s. The father's velocity is

Accepted Answer

A)  smaller than 3 m/s in the opposite direction as his daughter. 
B)  zero. 
C)  smaller than 3 m/s in the same direction as his daughter. 
D)  3 m/s in the same direction as his daughter. 
E)  3 m/s in the opposite direction as his daughter.
  
A)  smaller than 3 m/s in the opposite direction as his daughter. 
B)  zero. 
C)  smaller than 3 m/s in the same direction as his daughter. 
D)  3 m/s in the same direction as his daughter. 
E)  3 m/s in the opposite direction as his daughter.

Question 14

Suppose one's hand exerts a force of 12 N upward on a book weighing 10 N. The reaction to the force of the hand on the book is a force of

Accepted Answer

A)  10 N exerted by the Earth on the book. 
B)  10 N exerted by the book on the Earth. 
C)  12 N exerted by the book on the hand. 
D)  10 N exerted by the book on the hand. 
E)  2 N exerted by the book on the hand. 
A)  10 N exerted by the Earth on the book. 
B)  10 N exerted by the book on the Earth. 
C)  12 N exerted by the book on the hand. 
D)  10 N exerted by the book on the hand. 
E)  2 N exerted by the book on the hand.

Question 15

The erroneous idea that an object needs a force on it to keep moving even at constant velocity was held by

Accepted Answer

A)  Aristotle. 
B)  Galileo. 
C)  Newton. 
A)  Aristotle. 
B)  Galileo. 
C)  Newton.

Question 16

A physics professor places a soda pop can on the table and asks a student to identify the forces acting upon the can and the directions of each force. The two forces acting on the soda pop can are

Accepted Answer

A)  the weight force downward and normal force from the table downward. 
B)  the weight force downward and normal force from the table upward. 
C)  the weight force upward and normal force from the table downward. 
D)  the weight force upward and normal force from the table upward. 
A)  the weight force downward and normal force from the table downward. 
B)  the weight force downward and normal force from the table upward. 
C)  the weight force upward and normal force from the table downward. 
D)  the weight force upward and normal force from the table upward.

Question 17

In the diagram below, a force acting on a block is shown by the arrow labeled F. The mass of the block is known, as is the size of the force, but the observed acceleration is larger than F/m and so another force must act on the block. In which direction (A, B, C, or D) is this force?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
A)  A 
B)  B 
C)  C 
D)  D

Question 18

All except one of the following require the application of a net force. Which one is the exception?

Accepted Answer

A)  Changing an object from a state of rest to a state of motion 
B)  Changing an object's speed without changing its direction of motion 
C)  Maintaining an object in motion at a constant velocity 
D)  Maintaining an object in uniform circular motion 
E)  Changing an object's direction of motion without changing its speed 
A)  Changing an object from a state of rest to a state of motion 
B)  Changing an object's speed without changing its direction of motion 
C)  Maintaining an object in motion at a constant velocity 
D)  Maintaining an object in uniform circular motion 
E)  Changing an object's direction of motion without changing its speed

Question 19

In the trajectory of a thrown object, like a baseball, the weight force is always downward. However, the force of air resistance is always

Accepted Answer

A)  upward. 
B)  horizontal. 
C)  tangent to the trajectory and in the direction opposite the velocity. 
D)  perpendicular to the trajectory.
Fill in the Blank Questions 
A)  upward. 
B)  horizontal. 
C)  tangent to the trajectory and in the direction opposite the velocity. 
D)  perpendicular to the trajectory.
Fill in the Blank Questions

Question 20

A light body and a heavy body are both given identical accelerations. The body acted upon by the larger force is the ________________ body.

Accepted Answer

The answer of A light body and a heavy body...

Exam 4: Newtons Laws: Explaining Motion

Two pieces of kryptonite, #1 and #2, have identical masses, but the net force applied to #1 is 400 N and to #2 is 20 N. The acceleration

The surface gravity of Mars is 3.7 m/s2. If a person with mass of 100 kg were parachuting on Mars, what would be the force exerted by air resistance at terminal velocity?

A 10-pound sack of potatoes falls from an airplane. As the velocity of the falling sack increases, so does the air resistance on it. When the air resistance equals 10 pounds, the acceleration of the sack will be

You stand on a scale to measure your weight. The reaction to the force the Earth exerts on you is

A certain force causes a 50 kg person to accelerate at 1.0 m/s2. The same force applied to a 75-kg person would cause

The acceleration of gravity on the Moon's surface is about 1/6 of that on the Earth's surface. An object on the Earth is to be taken to the Moon. We can state that, compared to the Earth,

Three forces act on the object in the sketch. In what direction will the object move?

A body sliding on a table is observed to gradually slow down. The correct statement is that the body slows down because

A child, whose weight is 150 newtons, lifts a pumpkin from the ground with a force of 50 newtons. The force the pumpkin exerts on the child is

The net force acting on a body gives the direction of the ________________ of the body.

A blob of green cheese at the Cheese Institute on the Earth has a mass of 8.1 kg. The same cheese blob in outer space will have a mass of ____________ kg.

A parachutist jumping from an airplane reaches a terminal velocity when the force of air resistance is 980 N. The mass of the parachutist is

A father and his young daughter are on very clean ice, so there is very little friction (the father has more mass than the daughter). The father pushes his daughter forward and she slides away at a speed of 3 m/s. The father's velocity is

Suppose one's hand exerts a force of 12 N upward on a book weighing 10 N. The reaction to the force of the hand on the book is a force of

The erroneous idea that an object needs a force on it to keep moving even at constant velocity was held by

A physics professor places a soda pop can on the table and asks a student to identify the forces acting upon the can and the directions of each force. The two forces acting on the soda pop can are

In the diagram below, a force acting on a block is shown by the arrow labeled F. The mass of the block is known, as is the size of the force, but the observed acceleration is larger than F/m and so another force must act on the block. In which direction (A, B, C, or D) is this force?

All except one of the following require the application of a net force. Which one is the exception?

In the trajectory of a thrown object, like a baseball, the weight force is always downward. However, the force of air resistance is always

A light body and a heavy body are both given identical accelerations. The body acted upon by the larger force is the ________________ body.

Physics, the Fundamental Science

Describing Motion

Falling Objects and Projectile Motion

Circular Motion, the Planets, and Gravity

Energy and Oscillations

Momentum and Impulse

Rotational Motion of Solid Objects

The Behavior of Fluids

Temperature and Heat

Heat Engines and the Second Law of Thermodynamics

Electrostatic Phenomena

Electric Circuits

Magnets and Electromagnetism

Making Waves

Light Waves and Color

Light and Image Formation

The Structure of the Atom

The Nucleus and Nuclear Energy

Relativity

Beyond Everyday Phenomena

Filters

The surface gravity of Mars is 3.7 m/s². If a person with mass of 100 kg were parachuting on Mars, what would be the force exerted by air resistance at terminal velocity?

A certain force causes a 50 kg person to accelerate at 1.0 m/s². The same force applied to a 75-kg person would cause