Question 1

When someone throws a football, what should the launch angle be (ignoring air resistance) so that it travels a maximum distance?

Accepted Answer

Without air resistan

Question 2

Is it possible for the magnitude of an object's average velocity to be greater than its average speed? How about average speed being greater than the magnitude of the average velocity? Please explain.

Accepted Answer

The magnitude of the average velocity fo

Question 3

Suppose you do 1000 J of work on a 5 kg object, and all the work went into lifting it above the ground. How high above the ground will the object be when all the work has been done?

Accepted Answer

A)  100 m 
B)  5 m 
C)  20 m 
D)  1 m 
A)  100 m 
B)  5 m 
C)  20 m 
D)  1 m

Question 4

What is the potential energy of a 40 kg box that is 6m above the ground?

Accepted Answer

A)  240 J 
B)  2400 J 
C)  6 J 
D)  60 J 
A)  240 J 
B)  2400 J 
C)  6 J 
D)  60 J

Question 5

Suppose you go from the earth to a planet where the acceleration of gravity is 3 m/s2. On the new planet your mass will

Accepted Answer

A)  be 1/3 its value on Earth 
B)  be 9 times its value on Earth 
C)  be 3/10 its value on Earth 
D)  not change 
A)  be 1/3 its value on Earth 
B)  be 9 times its value on Earth 
C)  be 3/10 its value on Earth 
D)  not change

Question 6

In physics we often make approximations. We say, for example that when you push against a stationary wall, no work is done. Thinking about details of the system is this true? Please explain.

Accepted Answer

No this is not strictly true. The human

Question 7

You are in your car at a stop light and start off really quickly. As you accelerate several items fall off the dashboard and on to the floor. Please explain why your car is a non - inertial reference frame.

Accepted Answer

An inertial reference frame is one where

Question 8

A car starts from rest and accelerates at 4 m/s2. How much time will it take the car to reach a speed of 20 m/s?

Accepted Answer

A)  5 s 
B)  10 s 
C)  4 s 
D)  8 s 
A)  5 s 
B)  10 s 
C)  4 s 
D)  8 s

Question 9

If you are backing up but slowing down, your acceleration is directed

Accepted Answer

A)  backwards 
B)  nowhere 
C)  forwards 
D)  to the left 
A)  backwards 
B)  nowhere 
C)  forwards 
D)  to the left

Question 10

Under what conditions are the values of average speed and the magnitude of the average velocity equal?

Accepted Answer

A)  When moving in a straight line 
B)  When moving in a straight line and not turning around 
C)  When moving in a circular path 
D)  When walking around the perimeter of a rectangle 
A)  When moving in a straight line 
B)  When moving in a straight line and not turning around 
C)  When moving in a circular path 
D)  When walking around the perimeter of a rectangle

Question 11

Suppose your instructor staggers into class after an all - night physics textbook sampling party and states Newton's second law as "If an object experiences a force then it will accelerate. If there are no forces acting on it then it will stand still." Please give three examples (from class, real life or made up) which expose mistakes on his part and briefly explain how they show his inaccuracies.

Accepted Answer

(Answers will vary):
1) An object has to

Question 12

Suppose you are on another planet and you want to measure its acceleration of gravity so you drop an object from rest. It hits the ground, traveling a distance of 0.8 m in 0.5 second and then bounces back up and stops exactly where it started from.
-With what speed did the ball hit the ground?

Accepted Answer

v = gt = 6

Question 13

The maximum height above the ground for a the gymnast jumping straight upward with an initial speed of 10 m/s is

Accepted Answer

A)  5 m 
B)  10 m 
C)  2 m 
D)  15 m 
A)  5 m 
B)  10 m 
C)  2 m 
D)  15 m

Question 14

In order to do a negative amount of work you must

Accepted Answer

A)  exert a force and move in the direction of the force 
B)  exert a force and move opposite to the direction of the force. 
C)  exert a force or move 
D)  change an object's position 
A)  exert a force and move in the direction of the force 
B)  exert a force and move opposite to the direction of the force. 
C)  exert a force or move 
D)  change an object's position

Question 15

Suppose you push horizontally on the wall of a building. For you to do work on the wall, which of the following need to happen?

Accepted Answer

A)  the wall moves away from you 
B)  the wall lifts up 
C)  the wall moves sideways 
D)  b and c 
A)  the wall moves away from you 
B)  the wall lifts up 
C)  the wall moves sideways 
D)  b and c

Question 16

Your friend and you are at the mall shopping. She stops, grabs your arm and exclaims that she is worried about her physics test she took last Friday because she ignored the work done by (or against) the normal force when a person is being lifted in an elevator. What would you (correctly) reply to her?

Accepted Answer

I would say (correctly) that the normal

Question 17

Suppose you go from the earth to a planet where the acceleration of gravity is 2.5 m/s2. On the new planet your weight will be about

Accepted Answer

A)  be ¼ its value on Earth 
B)  quadruple 
C)  double 
D)  the sane as 
A)  be ¼ its value on Earth 
B)  quadruple 
C)  double 
D)  the sane as

Question 18

Suppose you are at a stop light and realize that an important antique physics textbook sale ends in five minutes. Naturally, you start off very rapidly. To you, some papers on the dashboard fly straight backwards. To an observer on the ground they

Accepted Answer

A)  remained where they were. 
B)  moved forward rapidly. 
C)  moved backwards rapidly. 
D)  fell straight down. 
A)  remained where they were. 
B)  moved forward rapidly. 
C)  moved backwards rapidly. 
D)  fell straight down.

Question 19

Suppose Larissa throws a ball up in the air and it comes back down to the same place she threw it from. Ignoring times when the ball is in contact with her hand, and ignoring air resistance (friction with the air), identify the point(s) of
-Maximum and minimum potential energy.

Accepted Answer

Here the points of maximum and minimum h

Question 20

Your weight and mass are different in that

Accepted Answer

A)  your weight is measured in kg but not your mass 
B)  your mass depends upon local gravity but your weight does not. 
C)  your weight depends upon local gravity but your mass does not. 
D)  being weightless means that you have to lose mass. 
A)  your weight is measured in kg but not your mass 
B)  your mass depends upon local gravity but your weight does not. 
C)  your weight depends upon local gravity but your mass does not. 
D)  being weightless means that you have to lose mass.

When someone throws a football, what should the launch angle be (ignoring air resistance) so that it travels a maximum distance?

Is it possible for the magnitude of an object's average velocity to be greater than its average speed? How about average speed being greater than the magnitude of the average velocity? Please explain.

Suppose you do 1000 J of work on a 5 kg object, and all the work went into lifting it above the ground. How high above the ground will the object be when all the work has been done?

What is the potential energy of a 40 kg box that is 6m above the ground?

Suppose you go from the earth to a planet where the acceleration of gravity is 3 m/s². On the new planet your mass will

In physics we often make approximations. We say, for example that when you push against a stationary wall, no work is done. Thinking about details of the system is this true? Please explain.

You are in your car at a stop light and start off really quickly. As you accelerate several items fall off the dashboard and on to the floor. Please explain why your car is a non - inertial reference frame.

A car starts from rest and accelerates at 4 m/s². How much time will it take the car to reach a speed of 20 m/s?

If you are backing up but slowing down, your acceleration is directed

Under what conditions are the values of average speed and the magnitude of the average velocity equal?

Suppose you are on another planet and you want to measure its acceleration of gravity so you drop an object from rest. It hits the ground, traveling a distance of 0.8 m in 0.5 second and then bounces back up and stops exactly where it started from. -With what speed did the ball hit the ground?

The maximum height above the ground for a the gymnast jumping straight upward with an initial speed of 10 m/s is

In order to do a negative amount of work you must

Suppose you push horizontally on the wall of a building. For you to do work on the wall, which of the following need to happen?

Suppose you go from the earth to a planet where the acceleration of gravity is 2.5 m/s². On the new planet your weight will be about

Suppose you are at a stop light and realize that an important antique physics textbook sale ends in five minutes. Naturally, you start off very rapidly. To you, some papers on the dashboard fly straight backwards. To an observer on the ground they

Suppose Larissa throws a ball up in the air and it comes back down to the same place she threw it from. Ignoring times when the ball is in contact with her hand, and ignoring air resistance (friction with the air), identify the point(s) of -Maximum and minimum potential energy.

Your weight and mass are different in that

The Laws of Motion, Part 2

Mechanical Objects, Part 1

Mechanical Objects, Part 2

Fluids

Fluids and Motion

Heat and Phase Transitions

Thermodynamics

Resonance and Mechanical Waves

Electricity

Magnetism and Electrodynamics

Electromagnetic Waves

Light

Optics and Electronics

Modern Physics

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Exam 1: The Laws of Motion, Part 1

When someone throws a football, what should the launch angle be (ignoring air resistance) so that it travels a maximum distance?

Is it possible for the magnitude of an object's average velocity to be greater than its average speed? How about average speed being greater than the magnitude of the average velocity? Please explain.

Suppose you do 1000 J of work on a 5 kg object, and all the work went into lifting it above the ground. How high above the ground will the object be when all the work has been done?

What is the potential energy of a 40 kg box that is 6m above the ground?

Suppose you go from the earth to a planet where the acceleration of gravity is 3 m/s2. On the new planet your mass will

In physics we often make approximations. We say, for example that when you push against a stationary wall, no work is done. Thinking about details of the system is this true? Please explain.

You are in your car at a stop light and start off really quickly. As you accelerate several items fall off the dashboard and on to the floor. Please explain why your car is a non - inertial reference frame.

A car starts from rest and accelerates at 4 m/s2. How much time will it take the car to reach a speed of 20 m/s?

If you are backing up but slowing down, your acceleration is directed

Under what conditions are the values of average speed and the magnitude of the average velocity equal?

Suppose you are on another planet and you want to measure its acceleration of gravity so you drop an object from rest. It hits the ground, traveling a distance of 0.8 m in 0.5 second and then bounces back up and stops exactly where it started from. -With what speed did the ball hit the ground?

The maximum height above the ground for a the gymnast jumping straight upward with an initial speed of 10 m/s is

In order to do a negative amount of work you must

Suppose you push horizontally on the wall of a building. For you to do work on the wall, which of the following need to happen?

Suppose you go from the earth to a planet where the acceleration of gravity is 2.5 m/s2. On the new planet your weight will be about

Suppose you are at a stop light and realize that an important antique physics textbook sale ends in five minutes. Naturally, you start off very rapidly. To you, some papers on the dashboard fly straight backwards. To an observer on the ground they

Suppose Larissa throws a ball up in the air and it comes back down to the same place she threw it from. Ignoring times when the ball is in contact with her hand, and ignoring air resistance (friction with the air), identify the point(s) of -Maximum and minimum potential energy.

Your weight and mass are different in that

The Laws of Motion, Part 2

Mechanical Objects, Part 1

Mechanical Objects, Part 2

Fluids

Fluids and Motion

Heat and Phase Transitions

Thermodynamics

Resonance and Mechanical Waves

Electricity

Magnetism and Electrodynamics

Electromagnetic Waves

Light

Optics and Electronics

Modern Physics

Filters

Suppose you go from the earth to a planet where the acceleration of gravity is 3 m/s². On the new planet your mass will

A car starts from rest and accelerates at 4 m/s². How much time will it take the car to reach a speed of 20 m/s?

Suppose you go from the earth to a planet where the acceleration of gravity is 2.5 m/s². On the new planet your weight will be about