Physical Science 1116 self test
v. potential
energy of position
wedge
fifth simple machine
y. newton
1 kg.m/sec2
Velocity
______________________ is the rate at which an object covers a distance in a particular direction.
Speed
______________________ is the rate at which an object covers distance.
Friction, gravity, resistance
___________________________, the force of _______________________, and air _________________________ are the three external forces that act upon moving objects on Earth.
x. dyne
1 g.cm/sec2
first-class
A ________________________ lever changes direction or gains force or speed.
second-class, third-class
A _______________________________ lever gains force and a __________________________________ lever gains speed.
f. inertia
resistance to change in motion
pulley
second simple machine
screw
sixth simple machine
l. v= d/t
speed
i. oc
symbol for proportionality
e. G
symbol for universal gravitational constant
axle and wheel
third simple machine
h. T= Fd
torque
m. kilogram
unit for mass
u. watt
unit for power
b. newton, dyne
unites for weight or force
w. friction
wastes much useful energy in transformations
m. w= Mg
weight
e. W= Fd
work
checkmark
A body remains at rest or moves with constant velocity in a straight line unless an outside force acts upon it.
constant
A proportionality ______________________ is an unchanging mathematical quantity.
speed, direction
Acceleration may be either a change in _________________ or in ____________________.
no checkmark
Any two objects attract each other with a force direct proportional to the product of their masses and inversely proportional to the square of the distance between them.
no checkmark
Energy can be neither created nor destroyed, but only changed from one form to another.
39
Exercise number ______________ is the law of universal gravitation.
36
Exercise number _______________ is the law of conservation of energy.
34
Exercise number _______________ is the law of conservation of momentum.
checkmark
For every action there is an equal and opposite reaction.
weak
Gravity is an incredibly ____________________ force.
resistance, effort
Moving a greater ______________________ with a smaller _____________________________ is the purpose o most machines.
checkmark
The acceleration of an object is directly proportional to the force applied and inversely proportional to the mass.
mass, velocity
The motion of an object is affected by its _____________________ and ______________________.
no checkmark
The total momentum of two objects before a collision equals the total momentum after the collision.
kinetic
The two factors which determine the ________________________ energy of an object are its mass and its velocity.
potential
The two factors which determine the ________________________ energy of an object are its weight and its distance above the ground.
distance
Work is accomplished any time a force moves matter a measurable ______________________.
Acceleration
_____________________ is a change in velocity in a given period of time.
q. energy
ability to do work
d. a= v/t
acceleration
no checkmark
an object with more mass has more inertia than a body with less mass.
g. motion
change in location or position
s. Pt=Pt'
conservation of momentum
p. d= 1/2 gt2
distance an object falls during a certain period of time
o. DE
distance between effort and fulcrum
s. DR
distance between load and fulcrum
n. pitch
distance between threads of a screw
z. kinetic
energy of motion
r. effort x DE = load x DR
equilibrium state of a lever
lever
first simple machine
b. F= Ma
force
i. F= MG
force of falling object
h. weight
force of gravitational pull on an object
c. torque
force producing rational movement
j. centripetal
force that causes objects to follow a curved path
l. centrifugal
force that causes objects to follow a straight-line path
k. momentum
force that maintains motion
inclined plane
fourth simple machine
k. KE= 1/2 Mv2
kinetic energy
f. MA= R/E
mechanical advantage
t. MA= DE/DR
mechanical advantage of a lever
o. MA= R/r
mechanical advantage of a wheel and axle
j. MA= slant-length/height
mechanical advantage of an inclined plane
q. P= Mv
momentum
a. angular
momentum in a curved or circular path
r. fulcrum
pivot around which a lever rotates
c. PE= wh
potential energy
n. P= W/t
power
t. power
rate at which work is done
d. 9.81 m/sec2
rate of acceleration due to gravity
aa. load
resistance
p. joule, erg
units for work
a. F= GM1M2/d2
universal gravitation
l. v- d/t
velocity
g. Vf=gt
velocity of a falling object just before impact
