CH 8 Flashcards
What is work?
FORCE X DISTANCE (in the direction of the applied force). Measured in JOULES
If you drag a block 20m with 5N or force, how much work did you do?
100 newton meters, or 100 JOULES
IF WORK=FORCExDISTANCE, then DISTANCE=
WORK/FORCE
IF WORK=FORCExDISTANCE, then FORCE=
WORK/DISTANCE
If you do 10 joules of work over 5 meters, how much force?
WORK/DIST= FORCE so 10 Joules/ 5 meters = 2 NEWTONs
If you do 20 joules of work using 5N of force, how far did you go?
WORK/FORCE=DISTANCE so 20 joules/ 5 newtons= 4 meters
What is POWER? (two ways)
WORK/TIME or FORCE*DISTANC/TIME. It measures the rate of work, how fast you can do the work
What is ENERGY?
Ability to do work. Like stored work.
What are the units of ENERGY?
JOULES - think of it as “work waiting to be done” or “stored work”
How is work different from energy?
WORK is being done, Energy is work waiting to be done, like a battery wating to be used.
How is work different from power?
Work is force*distance, and power is an amount of work per unit of time. It is work/time. Power is a RATE OF DOING WORK, basically, how fast you can do the work.
What is the unit of work we use?
JOULE (newton*meter)
What is the unit of power we use?
WATT (joule/sec) or (newton*meter/second)
What is the unit of energy we use?
JOULE (newton*meter)
Explain FORCE units two ways
Newton or kg*m/s2
