Time and Date Stamps (logged): 01:22:06 08-29-2008
¯°Ÿ±±Ÿ¯µ¯·Ÿ±¸Ÿ±¯¯·
Precalculus II
Technical Physics (Phy 111) Set 3 Test
Completely document your work and your reasoning.
You will be graded on your documentation, your reasoning, and the
correctness of your conclusions.
Date and Time are 02-15-2001 19:25:02
Signed by Learning Lab Attendant: ______________________
Date and Time: ______________________
Attendant:
Test is to be taken without reference to text or outside notes.
Calculator is allowed.
No time limit but test is to be taken in one sitting.
Please place test in Dave Smith's folder when completed.
Student:
Completely document your work.
Undocumented and unjustified answers may be counted wrong.
Besides undocument and unjustified answers, if wrong, never get partial credit.
.
.
.
.
.
.
.
.
.
.
Problem Number 1
If an object of mass m is acted on by a net force
F, it will increase in velocity at the rate a=F/m, where a is in meters per second per
second when F is in Newtons and m in kilograms (a is called the acceleration of the
object).
- This is Newton's Second Law. Remember it, and
remember its name.
An object of mass 16 Kg is acted on by a net force
of 26 Newtons.
- By how many meters per second per second does the
object's velocity change?
- By how many meters per second will its velocity
increase in 3 seconds?
.
.
.
.
.
.
.
.
.
.
Problem Number 2
By how much will the kinetic energy (abbreviated KE) of an object increase as a result
of a net force of 140 Newtons exerted over a distance of 60 meters, assuming (ideally)that
no energy is dissipated in the process?
.
.
.
.
.
.
.
.
.
.
Problem Number 3
How much force, exerted parallel to the direction of motion, is necessary when
pushing an object 3 meters in order to use up 54 Joules of energy from the pushing
source?
.
.
.
.
.
.
.
.
.
.
Problem Number 4
An object whose mass is 88 kilograms is accelerated from rest to 20 meters/second over
an unspecified time interval. It continues accelerating at the same average rate for an
equal time interval. The result is that its previous velocity is doubled.
- What will be the kinetic energy after the first time interval?
- What will be the kinetic energy after the second time interval?
- How many times as much kinetic energy does the object have after the
second time interval, compared with the kinetic energy at the end of the first time
interval?
.
.
.
.
.
.
.
.
.
.
Problem Number 5
An object of mass 11 kilograms is acted upon by a
net force of 53.9 Newtons.
- The object is initially at rest.
- During the first .5 seconds, based on its velocity
change, by how much will its KE increase?
- During the first .5 seconds, based on the distance
it travels, how much work is done by the net force on the object?