The equation for net external force is the sum of all the external forces applied to the object. For example, a compilation of common external forces is friction force, normal force, air resistance, tension and applied force. Because these are vectors, adding them together produces the correct total external force.
Although there are also internal forces acting on a body, these do not contribute to the total mechanical energy of a body when work is done on it, which is the quantity of greatest interest in calculations of external force. Work is the application of external force on a body to move it a certain distance.Learn More
To calculate the normal force on an object, draw a free body diagram, determine the surface's angle, factor in the other present forces, and solve for the normal force. Note that the normal force is perpendicular to the surface the object sits on.Full Answer >
If the net force acting on an object is zero, then it means that the object’s velocity is constant and the object isn’t speeding up or slowing down. That is, there is no acceleration on an object with zero net force.Full Answer >
Weight is the measure of the gravitational force on an object. Weight is related to mass but is actually a separate property. Weight and mass are often treated as interchangeable because gravity on Earth does not vary much based on location.Full Answer >
Net torque is the sum of all the individual torques acting on an object. Torque measures how much rotation-causing force is acting on an object. If the sum of all the torques is zero, the object is in rotational equilibrium.Full Answer >