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Newton's Second Law of Motion - Force and Acceleration
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Gravity
Terms in this set (39)
Unbalanced forces acting on an object
causes the object to accelerate
The combination of forces acting on an object
is the net force; acceleration depends on net force
Doubling the force on an object
doubles its acceleration
An objects acceleration is directly proportional to
the net force acting on it
Mass resists acceleration :
For a constant force
an increase in the mass will result in a decrease in the acceleration
The same force applied to twice as much mass results in
only half the acceleration
For a given force
the acceleration produced is inversely proportional to the mass. Inversely means that the two values change in opposite directions.
Newton's second law states
that the acceleration produced by a net force on an object is directly proportional to the magnitude of the net force, is in the same direction as the net force, and is inversely proportional to the mass of the object
Newton's second law describes the relationship among
an object's mass, an object's acceleration, and the net force on an object
Newton's second law in equation form
acceleration= net force/mass or a=F/m
Acceleration is equal to the
net force divided by mass
The force of friction between the surfaces depends on
the kinds of material in contact and how much the surfaces are pressed together
Friction acts on
materials that are in contact with each other, and it always acts in a direction to oppose relative motion
Liquid and gasses are called
fluids because they flow
Fluid friction
occurs when an object is moved through a fluid
Air resistance
is the friction acting on something moving through air
free - body diagram
a diagram showing all of the forces acting on an object
Applying force - pressure
For a constant force
an increase in the area of contact with result in a decrease in the pressure
Pressure
is the amount of force per unit of area
Pressure in equation form
pressure= force/area of application or P=F/A
Pressure is measured in
newtons per square meter, or Pascals (Pa)
One newton per square meter is equal to
one pascal
The smaller the area supporting a given force
the greater the pressure on that surface
All freely falling objects fall with the same acceleration because
the net force on an object is only it's weight, and the ratio of weight to mass is the same for all objects
A 10-kg cannonball and a 1-kg stone dropped from an elevated position at the same time
will fall together and strike the ground at practically the same time
Since mass and weight are proportional
a 10-kg cannonball experiences 10 times as much gravitational force as a 1-kg stone
The air resistance force an object experiences depends on
the object's speed and area
The force due to air resistance diminishes
the net force acting on falling objects
Terminal speed
is the speed at which the acceleration of a falling object is zero because friction balances the weight
Terminal velocity
is terminal speed together with the direction of motion
Force
A push or pull
equation for force
force=(mass)(acceleration due to gravity) or F=ma
The Unbalanced force is called the
Net force, or resultant of all forces acting on the system
SI unit of force
Newton, which equals one kilogram per meter second squared (N=kg*m/s squared)
Mass
the amount of matter in an object, does not change regardless of where an object is located. It is a constant property of any object.
Weight
Weight is simply the gravitational force acting on an object. Therefore, if an object is moved away from earth to a location where g is no longer 10.0m/s squared, the object will no longer have the the same weight as it did on Earth.
equation of weight is just a specific case of
F=ma
another equation for weight
weight=(mass)(acceleration due to gravity) or w=mg
Because of its weight, an object pushes against a surface on which it lies. By Newton's third law, the surface pushes back on the object. This push which is called the ________, _________________________
Normal force, is always perpendicular to the surface on which the object rests.
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