Table of Contents
What are the forces acting on a body?
Forces due to gravity, electric fields and magnetic fields are examples of body forces. Body forces contrast with contact forces or surface forces which are exerted to the surface of an object. Normal forces and shear forces between objects are surface forces as they are exerted to the surface of an object.
How do you find the force of gravity acting on a person?
Determine the force of gravity on a 68 kg person on the surface of the earth. Make sure all your variables have the proper units: m = 68 kg, g = 9.8 m/s2. Write your equation. Fgrav = mg = 68*9.8 = 666 N.
How does the force of gravity act upon an object?
The size of the gravitational force is proportional to the masses of the objects and weakens as the distance between them increases. Both objects exert an equal attractive force on each other: a falling object is attracting the Earth with the same size force as the Earth is attracting it.
How does force affect the acceleration of the body?
The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object. As the force acting upon an object is increased, the acceleration of the object is increased. As the mass of an object is increased, the acceleration of the object is decreased.
How does the force of gravity act on an object?
Gravity always acts downward on every object on earth. Gravity multiplied by the object’s mass produces a force called weight. Although the force of an object’s weight acts downward on every particle of the object, it is usually considered to act as a single force through its balance point, or center of gravity.
How is the force density of the body defined?
The body force density is defined so that the volume integral (throughout a volume of interest) of it gives the total force acting throughout the body; where dV is an infinitesimal volume element, ρ is the mass density, and g is the external body force density field acting on the system.
Is the force of gravity a fictitious force?
However, fictitious forces are not actually forces. Rather they are corrections to Newton’s second law when it is formulated in an accelerating reference frame. (Gravity can also be considered a fictitious force in the context of General Relativity .)
What is the definition of a body force?
A body force is a force that acts throughout the volume of a body.