Forces Flashcards
What are some non-contact forces?
Gravitational force, Electric force, Magnetic force.
What are some contact forces?
Normal contact force, Frictional force, Viscous/Drag force, Thrust, Lift, Upthrust.
What is a Gravitational Force?
It is an attractive force exerted by one mass on another.
What is a Magnetic force?
It is a force on a moving charge or a current-carrying conductor in a. magnetic field.
What is a normal contact force?
It is the force that a body exerts on another body when they are in physical contact.
What is a Frictional force?
It is a force that resists motion or tendency of motion of a body duo to the roughness of the surfaces in contact.
What is a Viscous/Drag force?
It is a resistive force that opposes motion of an object through a fluid.
What does Lift mean?
Lift is a force that acts on an aerofoil moving in fluid.
What is Thrust?
Thrust is a reaction force exerted by the expelled or accelerated mass on the system.
What is Upthrust?
Upthrust is the upward force exerted by a fluid on a submerged or floating object. It arises due to the difference in pressure between the upper and lower surfaces of the object.
Define Hooke’s Law.
Hooke’s Law states that extension(or compression) in a material is directly proportional to the applied force provided that the limit of proportionality is not exceeded.
What is the Archimedes’ Principle?
It states that the upthrust is equal in magnitude and opposite in direction to the weight of the fluid displaced by a submerged or floating object.
What is a moment?
The moment of a force about a pivot is the product of the force and the perpendicular distance from the pivot to line of action of the force.
What is a couple?
A couple is a pair of forces which are equal in magnitude but opposite in direction, and whose line of action do not coincide. A couple cases rotational motion only and no translational motion.
What is the torque of a couple?
It is the product of one of the forces and the perpendicular distance between the forces.
