# Physics

## Force and work in Electrical, Rotational, Thermal, and Electrical Systems.

published on January 27, 20162 responses 0 5.0★ / 5

heat energy
specific heat
specific gravity

### You use a voltmeter to

measure potential difference
measure current
measure pressure

14.7 psi
61 lb/ft3
62.4 lb/ft3

### Efficiency is

Work/mass
F x d
work out/ work in

1/10
1/6
1/4

### Heat can be expressed in

amps or volts
calories or joules
calcious or fahrenheit

kg
N x m
m/s2

AC
DC
Nice

### Newton's first law?

Law of inertia
Law of acceleration
law of interaction

### Archimedes Principle says:

every action has a equal and opposite reaction
the upwards force on the object is equal to the weight of the fluid displaced
the ratio of the density of a substance is to the density of water

### Check the advantages to a simple machine

allows you to do less work
reverses direction
shorter distance
make work easier

### Which is the bigger degree?

1 degree fahrenheit
1 degree celcius

### thermal energy is

measure of the average of each particle in the substance
sum total of the energy of all the particles within the substance

latent
sensible
calories

### T=

Force x distance
Mass x acceleration
Force x mass

3393lb
4456lb
20lbs

### Newton's third law is

the law of inertia.
the law of acceleration.
the law of interaction.

### What is the force-like quantity in a mechanical system?

force
pressure
temperature difference

F x d
F x mass
F x A

a barometer
a multimeter
an ammeter

True
False

a voltmeter
a battery
a generator

balance; scale
manometer; scale
scale; balance

horizontal
diagonal
vertical

force
pressure
voltage

### Characteristics of weight are

lb, N
slug
how hard gravity pulls on a mass
can change
cannot change

### In a real machine

work out = work in
work out > work in
work in > work out

F/A
N/m
m x a

no friction
lots of pressure

pressure
voltage
force

manometer
ammeter
hydrometer

### What is specific heat?

when an object is immersed in a fluid, the upwards force on the object is equal to the weight of the fluid displaced
amount of heat required to change the temperature of one gram of a substance by 1 degree
the ratio of the density of a substance to the density of water

### What is the force like quantity in a thermal system?

force
voltage
temperature difference

F/a
v/m
m/v

q=mc delta t
q= m x Hv
q=m x Hf

force
pressure
torque

### Heat moves from

hot air to cold air
warm temperature to cold tempature
high temperature to low temperature

### the advantage to using a pulley is that it

allows you to do less work
shortens the distance
reverses direction

### AC vs DC

current changes direction periodically; current in 1 direction
current in 1 direction; current changes direction periodically

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