Newton's 2nd Law
Newton's 3rd Law
Unbalanced Forces
Potential and Kinetic Energy
Law Conservation of Energy
100
If you hold an apple in your hand straight out from your body, your hand and the apple stay still. THis is due to the weight of the apple pushing down on your hand. What else must also be true? a) the weight of your hand pushes up on the apple b) the force on the apple from your hand pushes up on the apple c) the force on the apple from your hand pulls down on the apple d) there are no forces on the apple
b) the force on the apple from your hand pushes up on the apple
100
Which statement explains why a book resting on a table is in equilibrium? a) There is a net force acting downward on the book. b) The weight of the book equals the weight of the table. c) The acceleration due to gravity is 9.8 m/s2 for both the book and the table. d) The weight of the book and the table’s upward force on the book are equal in magnitude, but opposite in direction.
d) The weight of the book and the table’s upward force on the book are equal in magnitude, but opposite in direction.
100
When you draw free body diagrams (using force arrows,) what vector quantities must you include on the object the force is applied? a) Size (strength) and picture b) Size (strength) and direction c) Direction and picture d) Picture and dot on the object the force is applied
b) Size (strength) and direction
100
Which os the following has the most potential energy? a) a car on a straight path b) a car at the top of a hill c) a car at the bottom of a hill d) a car speeding down a hill
b) a car at the top of a hill
100
48. Which of the following statements correctly analyzes the Law of Conservation of Energy? a) Energy transformations can allow the total amount of energy to change. b) Energy transformations do not allow the total amount of energy to change. c) The total amount of energy is always increasing. d) The total amount of energy is always decreasing.
b) Energy transformations do not allow the total amount of energy to change.
200
In the Investigate lab you conducted in class, when you apply a constant force on any object, what is the result? a) the object will always speed up b) the object will always slow down c) the object will speed up and then slow down d) the object does not move
a) the object will always speed up
200
A man standing on a chair weighs 800 N. In order for the chair to support the man, the chair must exert an upward force of
800 N
200
40. When referring to weight, why do we say it is down (a negative vector quantity)? a) Weight is the amount of space an object takes up, so when it falls through air, it is pushed up due to air resistance on it. b) Weight and mass are the same, so the amount of mass is the amount of weight of the object. c) Weight is the pull of Earth on every mass toward the center (for us, that is down.) d) Weight is the amount of matter inside an object and all objects are made up of matter.
c) Weight is the pull of Earth on every mass toward the center (for us, that is down.)
200
Which is an example of kinetic energy? a) a ball stuck in a tree b) a Frisbee flying through the air c) a car at the bottom of a hill d) a car on a straight road
b) a Frisbee flying through the air
200
A ball is thrown vertically upward. As the ball rises, the ball’s total energy a) Decreases b) Increases c) Remains the same
c) Remains the same
300
The force required to accelerate a 2-kg mass at 4 m/s2 is
8 N
300
A book that is resting on a shelf 1.5 m above the floor has a weight of 12 N. The force the shelf exerts upon the book must be
12 N
300
A skateboarder is traveling to the right with a force of 20 N. All of a sudden a strong wind begins to blow against his motion with a force of 15 N. What is the skateboarder's net force, (include the direction.)
5 N to the right
300
Which of the following is an example of work? a) Ramiro holding a 50-kg mass above his head b) Vinny pushing his broken down car off the road and into the grass c) Leo standing on the top of his chair d) Kanitra pushing her feet against the wall
b) Vinny pushing his broken down car off the road and into the grass
300
When you measured your jump in class during the lab, when you reached your peak height, what form of energy was at its maximum? (Be specific)
Gravitational Potential Energy
400
On the planet Gamma a 4.0-kg mass experiences a gravitational force of 24 N. What is the acceleration due to gravity on Gamma?
6 m/s2
400
While closing a door of mass 10 kg, a student pushes on it with a force of 25 N. As the door is accelerating to close, what force does the door exert on the student?
25 N
400
What would the free body diagram look like for the following situation: A rock is falling straight down through the air. The rock has a weight of 5 N and is traveling at a constant speed.
There would be an arrow pointing upward, (labled: 5 N) and an arrow pointing downward, (labled: -5 N, must be NEGATIVE!)
400
In the golf ball lab you conducted, what relationship did you analyze between potential and kinetic energy? a) As the potential energy of an object increases, the kinetic energy of the same object increases. b) As the potential energy of an object increases, the kinetic energy of the same object decreases. c) As the potential energy of an object increases, the kinetic energy of the same object stays the same. d) As the potential energy of an object increases, the kinetic energy of the same object increases.
b) As the potential energy of an object increases, the kinetic energy of the same object decreases.
400
John is preparing to jump. If his total energy is 250 J, how much elastic potential energy does he have in his muscles when he bends his knees?
250 J
500
If the acceleration of an object is 4 m/s2 and the force is 2 N, what is the mass of the object?
0.5 kg
500
A man is attempting to push a chair across the floor with constant speed by exerting a force of 50 N. When will the chair exert a force of 50 N on the man?
In all cases, the chair will exert an equal and opposite force.
500
What would the free body diagram look like for the following situation: A skateboarder is traveling to the right with a force of 20 N. All of a sudden a strong wind begins to blow against his motion with a force of 15 N.
There would be a longer arrow pointing to the right, (labled: 20 N,) and a shorter arrow pointing toward the left(labeled: 15 N.)
500
When you throw a baseball straight up into the air, analyze the baseball’s potential and kinetic energy as it is travelling up (not coming down.) a) The baseball’s potential energy and kinetic energy never change as it goes up. b) The baseball’s potential energy decreases as it goes up, but its kinetic energy increases. c) The baseball’s potential energy and kinetic energy decrease as it goes up. d) The baseball’s potential energy increases as it goes up, but its kinetic energy decreases.
d) The baseball’s potential energy increases as it goes up, but its kinetic energy decreases.
500
If Marie has 200 J of elastic potential energy stored in her leg muscles before she jumps, how much GPE (gravitational potential energy) will she have at her peak (maximum height)?
200 J
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