Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
44 Cards in this Set
- Front
- Back
|
what is Newton's second law of motion
|
force=mass x acceleration
|
|
|
what is Newton's third law of motion
|
Every action is met with an equal and opposite reaction
|
|
|
What is static friction
|
neither object is moving
|
|
|
What is rolling friction
|
one object rolls over another object
|
|
|
define speed
|
the rate of motion
|
|
|
What is sliding friction
|
one object slides over another object
|
|
|
What is fluid friction
|
an object moves through liquid or air
|
|
|
What is Newton's first law of motion
|
An object at rest tends to stay at rest and an object in motion tends to stay in motion uunless acted upon by an outside force
|
|
|
define motion
|
change in position in relation to a reference point
|
|
|
define average speed
|
total distance divided by the total time
|
|
|
define reference point
|
a nonmoving point from which motion is measured
|
|
|
define velocity
|
speed in any given direction
(can change even when the number is constant) |
|
|
define acceleration
|
the rate of change of velocity
change in speed OR direction |
|
|
what does a curved line on a distance vs time graph mean
|
the object is accelerating
|
|
|
formula for speed
|
s=d/t
speed=distance/time s=m/s |
|
|
formula for acceleration
|
a=Vf-Vi/t
acceleration=final velocity-initial velocity/time a=m/s/s |
|
|
formula for velocity
|
v=d/t+direction
velocity=distance/time+direction v=m/s+direction |
|
|
define balanced force
|
net force of zero-the object isn't moving
|
|
|
define unbalanced force
|
nonzero net force- the object is moving
|
|
|
define free fall
|
the only force acting upon an object is gravity
|
|
|
define centripetal force
|
rotates an object in relation to the center of the circle
|
|
|
define centrifugal force
|
inertia that resists centripetal and causes the object to veer off in a straight line
|
|
|
formula for momentum
|
p=mv
momentum=mass x velocity m= kg x m/s |
|
|
why do astronauts in the international space center experience weightlessness
|
the astronauts are in free fall so they feel like they are falling but they aren't because centripetal force keeps them rotating earth
|
|
|
what is the rate of free fall
|
9.8 m/s/s
|
|
|
what is the difference between mass and weight
|
mass is the amount of object an object has
weight is how much gravitational force is pulling down weight changes with gravity matter doesn't |
|
|
draw a first class lever
|
check notes
|
|
|
draw a second class lever
|
check notes
|
|
|
draw a third class lever
|
check notes
|
|
|
draw a fixed pulley
|
check notes
|
|
|
draw a moveable pulley
|
check notes
|
|
|
which pulley changes magnitude of an object
|
movable
|
|
|
which pulley changes direction of an object
|
fixed
|
|
|
how does an inclined plane create a mechanical advantage
|
you do less work even though you have to go a farther distance. output force is greater than input
|
|
|
define work
what is the formula? |
using a force to move an object a distance (assuming the force and force and direction are the same)
w=fd work= force x direction w=Joules |
|
|
define power
what is the formula |
rate at which work iis done
P=w/t P=watts |
|
|
a wedge is a modified version of what simple machine
|
inclined plane
|
|
|
a wheel and axle is a modified version of what simple machine
|
lever
|
|
|
descriibe how friction can be an advantage and disadvantage
|
a machine cant work without friction but it will always spend some of the output force on overcoming friction so it can never be 100% efficient
|
|
|
what is the formula for kinetic energy
|
KE=1/2mv^2
|
|
|
what is the formula for potential energy
|
PE=mgh
|
|
|
name the three types of heat transfer
|
convection-
heat transfer through the fluid movement of currents radiation- heat transfer through electromagnetic waves waves conduction- heat transfer through direct contact |
|
|
what aare the three temperature scales and how do we use them
|
Fahrenheit- only used in america
Celsius- science and the rest of the world kelvin- extreme temperatures |
|
|
boiling and freezing point of water for each temperature scale
|
Fahrenheit- f=32 b=212
celcius- f=0 b=100 kelvin- f=0 b=273 |
