INSTRUCTIONS: Complete the following questions / problems as indicated. If you do not understand a question, or if you need constants or conversion faction factors, raise your hand. Except for the multiple choice questions, you will be graded on how well you communicate your understanding.

The first person to actively pursue the idea that if resistance could be REMOVED, an object would keep moving forever was

a. Kepler

b. Galileo

c. Aristotle

d. Newton

e. None of the above.

An unbalanced force of 2 Newtons is applied to a book and results in an acceleration of 1/3 m/s/s. What is the mass of the book?

a. 2.2 pounds exactly

b. about a pound

c. .666 kg

d. 6 kg

e. None of the above.

The force of friction

a. kept the space station, Skylab, from falling until 1979

b. is larger for sliding objects than stationary objects

c. always opposes the motion of the object

d. all of the above

e. None of the above.

In the movie, Frames of Reference, one segment showed the two physicists sliding a dry ice puck ( a device that slides with very little friction) back and forth. When was the speed of the dry ice puck the smallest (when viewed from the camera that showed the table to be moving)?

a. the puck never moved

b. moving to the right

c. moving to the left

d. both were the same

e. None of the above.

A large dictionary weighs about 70 Newtons. What is its mass? About

a. 15 pounds

b. 70 Newtons

c. 7 kg

d. 700 kg

e. None of the above.

Cavendish’s most important contribution to modern science was

a. the invention of the telescope

b. the discovery of spots on the sun

c. the idea that more massive bodies fall faster in a vacuum

d. the measurement of the gravitational constant G

e. None of the above.

If a car changes its speed (while driving in a straight line) from 20 m/s to 32 m/s, in 4 seconds, what is its acceleration?

a. 12 m/s/s

b. 13 m/s/s

c. 3 m/s/s

d. 56 m/s/s

e. None of the above.

A ball is rolls from the edge the top of a tall building with a horizontal speed of 6 m/s. Its horizontal velocity after falling for 1.5 seconds is about

a. 6 m

b. 9 m/s

c. 6 m/s

d. 9.8 m/s/s

e. None of the above.

According to Newton, the gravitational force between two objects

a. varies in proportion to each of the object’s mass

b. varies inversely with the square of the separation

c. is directed along the line joining the two objects

d. all of the above

e. None of the above.

Which of the following quantities is NOT a vector?

a. force

b. weight

c. velocity

d. displacement

e. None of the above.

If the separation between two objects is tripled, what happens to the gravitational force between the two objects?

a. it is unchanged

b. it is tripled

c. it is reduced to one third

d. it is reduced to one ninth

e. None of the above.

What was the pattern discovered by Galileo regarding the motion of an object down his inclined boards?

a. that the motion was as predicted by Aristotle

b. that the distance traveled in any interval obeyed the odd integer rule

c. that the velocity during any interval obeyed the odd integer rule

d. that Newton’s earlier predictions were correct.

e. None of the above.

FILL IN THE BLANK Supply the BEST word or words for the blanks shown below. ( pts ea)

In the demonstration that made use of the bucket, the force that causes the circular motion is due to _________________________ .

The _______________ velocity is found by constructing tangent line to the curve, at the point of interest, and finding the ____________________ of that line

________________ is the fundamental quantity with the least reproducible standard. It is also a measure of the ___________________ of an object.

 

QUESTIONS and SKETCHING Complete each of the following

Graphically determine the sum vector for the vectors shown to the right. Be neat, but you don’t need to use a ruler and protractor.

Make a strobe like sketch of the motion of the ball and the can used in the classroom demonstration. Make sufficient annotations to communicate clearly the motion.

 

 

 

 

 

 

In the article "Teflon flatcars and ferry boat rides", scales are used in the "rotator" to indicate the presence of a force. What is the cause of the force?

State in words Newton’s THREE laws of motion

Consider the case of a parachutist jumping from a hovering helicopter. Describe the subsequent motion of the person according to the world views of Aristotle, Galileo and Newton. Air resistance MAY NOT be neglected in this case.