how is velocity measured?
meters per 2nd
what is mass measured in?
what happens to an object when acceleration is negative?
it goes slower
the combination of all the forces acting on an object
2 or more forces exerted on an object are________ if their effects cancel each other and the do not cause a change in the object's motion
if the forces on an object are balanced, the net force is _____
if the forces are _______, their effects dont cancel each other.
any time the forces acting on an object are unbalanced, the net force is not zero and the motion of the object changes
if the net force acting on an object is zero, the object remains at rest, or if the object is already moving, continues to move in a straight line with constant speed
Newton's first law of motion
the force that brings nearly everything to a stop is ____, which is the force that acts to resist sliding bw 2 touching surfaces
_____is caused by the attraction bw the atom son the 2 surfaces that are in contact
____ slows down an object that slides... due to the microscopic roughness of 2 surfaces..... produced when the brake pads in a car's brakes rub against the wheels
_____makes a wheel or tire turn... occurs bw the ground and the part of the tire touching the ground... keeps tire from slipping on the ground...
_________ connects force, acceleration, and mass.... an object acted upon by a force will accelerate in the direction of the force
Newton's 2nd Law of Motion
Acceleration Equation =
acceleration (in meters/second) = net force (Newtons)/ mass (in kilograms) ........ a = Fnet/m
F = ma = m * (9.8m/s2)
gravitational force bw u and earth
______ is the point in an object that moves as if all the object's mass were concentrated at that point
center of mass
according to _____________, forces always act in equal but opposite pairs... for every action there is an equal but opposite reaction
Newton's 3rd Law of Motion
______ is the force per unit area that is applied on teh surface of an object
pressure equation =
pressure (in pascal's) = force (in newtons) / area (in meters squared) ....... P = F/A
weight = mass * acceleration
a ______ is any substance that has no definite shape and has the ability to flow
the _______ is an upward fprce that is exerted by a fluid on any object in the fluid
why does an object sink?
if the weight of the object is greater than the buoyant force, the net force on the object is downward and it sinks
if the buoyant force is equal to the object's weight, the forces are balanced and the object's float
the buoyant force on an object is equal to the weight of the fluid it displaces
______ of a fluid or an object is the mass of the object divided by the volume it occupies
D = m/v.............. density = mass / volume
when a force is applied to a fluid in closed container, the pressure in the fluid increases everywhere by the same amount
a _____ uses a fluid to increase an input force
when the speed of a fluid increases, the pressure exerted by the fluid decreases
the ability to cause change
_____ is the energy an object has due to its motion
the energy stored in an object bc of its position
increases as its temperature increases
the energy stored in chemical bonds
energy carried by light
the energy that is carried by an electric current
atomic nucleus contains energy that can be transformed into other forms of energy
energy is never created nor destroyed
law of conservation of energy
_____ a device that transforms kinetic energy into electrical energy
contains a set of narrowly spaced fan blades
an energy source that is used up much faster than it can be replaced
an energy source that is replinished continually
energy that is safer and cause less harm to the environment.... include solar, wind, and geothermal energy
_______________ is an energy source that cant be used up by humans
a _______ is a device that transforns radiant energy directly into electrical energy
a measure of the average value of the kinetic energy of the molecules in random motion
temperature conversion equations
F to C.... C = (5/9)(F-32)
C to F..... F = (9/5)(C) + 32
the sum of the kinetic and potential energy of all the molecules in an object is the _____ of the object
____ is thermal energy that is transferred from one object to another when the objects are at diffrent temperatures
______ occurs when the particles in a material collide with neighboring particles
heat transfer by _______ occurs when energy is transferred by electromagnetic waves
this transfer of thermal energy by the movement of molecules from one part of a material to another
a _____ is any material that easily transfers heat
amount of heat needed to raise the temperature of 1 kg of that substance by 1C
increase in temperature of a body of water caused by adding warmer water
a device that converts thermal energy into mechanical energy
the fuel burns in a combustion chamber inside the engine
internal combustion engine
speed (in meters/second) = distance (in meters) / time (in seconds) ......s = d / t
_____ is found by dividing the total distance traveled by the time taken
the speed of an object at one instant of time is the object's ________
an object is the speed of the object and the direction of its motion
the change in velocity divided by the time it takes for the change to occur
acceleration (in m/s2) = final speed - inital speed / time
tendency of an object to resit a change in its motion
an object is a measure of how hard it is to stop the object, and it depends on the object's mass and velocity
momentum is usually symbolized by
momentum = mass * velocity
the total momentum of objects that collide is the same before and after the collision
law of conservaition of momentum
if you increase an area the pressure will
what kind of energy comes from the sun?
bond bw atom of a match
geothermal energy comes from ____
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