New discoveries in science will continue to create a thousand new frontiers
for those who still would adventure.
- Herbert Hoover
Work (Joule)
Energy (Joule)kineticPower (Watt)
potential
efficiency
p. 61, group A, #1-6 except 5, (2nd edition text)Sample questions from material covered in Chapter 2:
p. 67, group A, #1-6 except 5, (3rd edition text)
Point value shown first)
6) Discuss the difference between mass and weight
6) If I had a 200 liter caldron of molten quartz (density ratio = 2.65), what is its mass?
6) Discuss an example of Newton's Third Law.
8) While driving here this morning in my 2000 kg automobile, I increased my speed from 20 to 40 meters per second over ten seconds to pass a potato truck. Show in mathematical terms and using proper units what my acceleration was during that interval.
5) Once I had completed my acceleration to 40 m/s, what was my Momentum?
5) What was the Force needed to achieve this acceleration?
6) How did Aristotle and Galileo differ in their opinions on the motion of bodies in free fall?
1st question (about mass and weight) - refer to notes and the text.
2nd question. The mass of a 200 liter caudron of WATER would be
the mass of a liter of water is 1 kg, so 200 liters would be 200 kg.3rd question (Newton's third law) - refer to notes and text.
quartz has a mass 2.65 times that of water,
so 200 liter of quarts would have mass = 200 kg * 2.65 = 530 kg
4th question. 2000 kg car going 20 -40 m/s over ten seconds.
acceleration equals change in v / change in t5th question.
change in v = 40-20 = 20 m/s
change in t = 10 s
acceleration = 20 m/s / 10 s = 2 m/s2
momentum = mv6th question.
= 2000 kg * 40 m/s
= 80000 kgm/s
Force = F = ma7th question. (Archimedes and Galileo)- refer to notes and text.
= 2000 kg * 2 m/s2
= 4000 kgm/s2
= 4000 N (Newtons)