Question 1

The SI units of acceleration are

Accepted Answer

A)  m/s 
B)  kgm/s2 
C)  m/s2 
D)  kg m2/s2 
A)  m/s 
B)  kgm/s2 
C)  m/s2 
D)  kg m2/s2

Question 2

If you have a mass of 80 kg and are in a planet where the acceleration of gravity is 5 m/s2, your weight on the planet is

Accepted Answer

A)  400 N 
B)  4000 N 
C)  16 N 
D)  80 N 
A)  400 N 
B)  4000 N 
C)  16 N 
D)  80 N

Question 3

Suppose you have two cars, and the larger one is twice as massive as the smaller one. If you and a friend push on them so that their accelerations are equal, how must the forces applied to the cars compare?

Accepted Answer

A)  The force on the larger car is equal to that on the smaller car 
B)  The force on the larger car is ½ that on the smaller car. 
C)  The force on the larger car is twice that on the smaller car. 
D)  The force on the larger car is more than three times that on the smaller car. 
A)  The force on the larger car is equal to that on the smaller car 
B)  The force on the larger car is ½ that on the smaller car. 
C)  The force on the larger car is twice that on the smaller car. 
D)  The force on the larger car is more than three times that on the smaller car.

Question 4

You throw brick straight up. Ignoring air resistance, after it leaves your hand it will experience

Accepted Answer

A)  only the downward force of its weight, both before and after it reaches its maximum height. 
B)  both an upward force, and the downward force of its weight after it rises. The upward force will gradually diminish to zero at the ball's maximum height, after which the ball will experience only the
Downward force of its weight. 
C)  an upward force as it rises. This upward force will gradually diminish to zero at the ball's maximum height, after which the ball will experience only the downward force of its weight. 
D)  the upward force of its weight as it rises. Once the ball reaches its maximum height, it will begin to experience the downward force of its weight. 
A)  only the downward force of its weight, both before and after it reaches its maximum height. 
B)  both an upward force, and the downward force of its weight after it rises. The upward force will gradually diminish to zero at the ball's maximum height, after which the ball will experience only the
Downward force of its weight. 
C)  an upward force as it rises. This upward force will gradually diminish to zero at the ball's maximum height, after which the ball will experience only the downward force of its weight. 
D)  the upward force of its weight as it rises. Once the ball reaches its maximum height, it will begin to experience the downward force of its weight.

Question 5

Driving down the road, you hit an insect. How does the force your car exerts on the insect compare to the force the insect exerts on the car?

Accepted Answer

A)  The force the car exerts on the insect is less. 
B)  The force the insect exerts on the car is less. 
C)  The two forces are equal in magnitude. 
D)  The insect exerts no force on the car 
A)  The force the car exerts on the insect is less. 
B)  The force the insect exerts on the car is less. 
C)  The two forces are equal in magnitude. 
D)  The insect exerts no force on the car

Question 6

Your class is rather unhappy with the instructor, and they pitch in and decide to fund a sabbatical for him to go to Mars. Unbeknownst to the students the following semester, the instructor has made long distance course arrangements so the "show can go on". The instructor begins talking about mass, weight and related things. He correctly makes which following statement:

Accepted Answer

A)  his mass is still essentially unchanged but his weight is less than on earth. 
B)  his weight is still essentially unchanged but his mass is less than on earth. 
C)  neither his weight nor his mass have changed much. 
D)  his weight and mass have both changed significantly. 
A)  his mass is still essentially unchanged but his weight is less than on earth. 
B)  his weight is still essentially unchanged but his mass is less than on earth. 
C)  neither his weight nor his mass have changed much. 
D)  his weight and mass have both changed significantly.

Question 7

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.
-Please calculate the acceleration of gravity on this planet.

Accepted Answer

d = ½ g t² so 0.8 = ½

Question 8

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 total mechanical energy.

Accepted Answer

Since friction or other dissip

Question 9

Suppose you do some work on an object. Think of two ways you can tell work has been done on the object just by observing the object.

Accepted Answer

One way to tell is to look at the height

Question 10

Suppose you throw a ball downwards with a certain initial speed from a certain height h above the ground, and someone else throws a ball directly upward at the same speed, so the two balls collide. Will the two balls collide in the middle of the path (h/2), above the middle or below? Please explain.

Accepted Answer

The ball on top is speeding up

Question 11

Consider a 6 kg box of holiday candy on a horizontal surface such as a table. There is a 10N applied force to the right and a 7 N frictional force to the left. Suppose the block moves 3 m to the right across the table, to its impending doom of hungry guests.
-Please calculate the work done by the 10 N force.

Accepted Answer

W = Fd = (

Question 12

You push on a box with a horizontal force of 20 N and the box moves a distance of 8 m. The amount of work you have done on the box is

Accepted Answer

A)  160 J 
B)  320 J 
C)  20J 
D)  0 
A)  160 J 
B)  320 J 
C)  20J 
D)  0

Question 13

Please briefly discuss two situations where no work is done by a force.

Accepted Answer

One is where there is no dista

Question 14

The acceleration of an object is equal to

Accepted Answer

A)  the rate of change of its position 
B)  the rate of change of its velocity 
C)  the rate of change of its speed only 
D)  the time an object has been in motion 
A)  the rate of change of its position 
B)  the rate of change of its velocity 
C)  the rate of change of its speed only 
D)  the time an object has been in motion

Question 15

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.
-Taking the beginning of the motion as the time the ball was dropped, how does its average speed compare to the magnitude of its average velocity on the way up?

Accepted Answer

On the way up, the average speed and ave

Question 16

Suppose an object is traveling at terminal velocity, so it is falling through air but not accelerating. How does the force of air resistance compare to its weight?

Accepted Answer

A)  The two forces are equal and opposite. 
B)  The two forces are equal. 
C)  Air resistance is greater than the ball's weight. 
D)  Air resistance is less than the ball's weight. 
A)  The two forces are equal and opposite. 
B)  The two forces are equal. 
C)  Air resistance is greater than the ball's weight. 
D)  Air resistance is less than the ball's weight.

The SI units of acceleration are

If you have a mass of 80 kg and are in a planet where the acceleration of gravity is 5 m/s², your weight on the planet is

Suppose you have two cars, and the larger one is twice as massive as the smaller one. If you and a friend push on them so that their accelerations are equal, how must the forces applied to the cars compare?

You throw brick straight up. Ignoring air resistance, after it leaves your hand it will experience

Driving down the road, you hit an insect. How does the force your car exerts on the insect compare to the force the insect exerts on the car?

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 total mechanical energy.

Suppose you do some work on an object. Think of two ways you can tell work has been done on the object just by observing the object.

Suppose you throw a ball downwards with a certain initial speed from a certain height h above the ground, and someone else throws a ball directly upward at the same speed, so the two balls collide. Will the two balls collide in the middle of the path (h/2), above the middle or below? Please explain.

You push on a box with a horizontal force of 20 N and the box moves a distance of 8 m. The amount of work you have done on the box is

Please briefly discuss two situations where no work is done by a force.

The acceleration of an object is equal to

Suppose an object is traveling at terminal velocity, so it is falling through air but not accelerating. How does the force of air resistance compare to its weight?

The Laws of Motion, Part 2

Mechanical Objects, Part 1

Mechanical Objects, Part 2

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Fluids and Motion

Heat and Phase Transitions

Thermodynamics

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Exam 1: The Laws of Motion, Part 1

The SI units of acceleration are

If you have a mass of 80 kg and are in a planet where the acceleration of gravity is 5 m/s2, your weight on the planet is

Suppose you have two cars, and the larger one is twice as massive as the smaller one. If you and a friend push on them so that their accelerations are equal, how must the forces applied to the cars compare?

You throw brick straight up. Ignoring air resistance, after it leaves your hand it will experience

Driving down the road, you hit an insect. How does the force your car exerts on the insect compare to the force the insect exerts on the car?

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 total mechanical energy.

Suppose you do some work on an object. Think of two ways you can tell work has been done on the object just by observing the object.

You push on a box with a horizontal force of 20 N and the box moves a distance of 8 m. The amount of work you have done on the box is

Please briefly discuss two situations where no work is done by a force.

The acceleration of an object is equal to

Suppose an object is traveling at terminal velocity, so it is falling through air but not accelerating. How does the force of air resistance compare to its weight?

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

If you have a mass of 80 kg and are in a planet where the acceleration of gravity is 5 m/s², your weight on the planet is