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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
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
____ 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
______ 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
pressure equation =
pressure (in pascal's) = force (in newtons) / area (in meters squared) ....... P = F/A
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
when a force is applied to a fluid in closed container, the pressure in the fluid increases everywhere by the same amount
when the speed of a fluid increases, the pressure exerted by the fluid decreases
energy that is safer and cause less harm to the environment.... include solar, wind, and geothermal energy
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
this transfer of thermal energy by the movement of molecules from one part of a material to another
an object is a measure of how hard it is to stop the object, and it depends on the object's mass and velocity
the total momentum of objects that collide is the same before and after the collision
law of conservaition of momentum
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