Kinetics Flashcards
(22 cards)
What is kinetics the study of?
The study of motion and the forces that cause it.
What relationship does kinetics analysis for translational motion?
The relationship between force and mass.
What relationship does kinetics analysis for rotational motion?
The relationship between torque and moment of inertia.
What is linear momentum?
The product of mass and velocity.
When is momentum conserved?
When no external forces act on the particle.
What happens to the velocity and direction of the particle in the absence of external forces?
The velocity and direction are unchanged.
What does the law of conservation of momentum state?
That linear momentum is unchanged if no unbalanced forces act on the particle.
Does the law of conservation of momentum prohibit the mass and velocity from changing?
No these can still change but the momentum stays the same.
What is Newton’s first law of motion state?
That a particle will remain in a state of rest or will continue to move with constant velocity unless an unbalanced external force acts on it.
What does Newton’s second law of motion state?
States that the acceleration of a particle is directly proportional to the force acting on it and is inversely proportional to the particle mass.
In what direction is the acceleration to the force in newton’s second law of motion?
It is in the same direction as the force.
What is the equation of newton’s second law state?
The force vector required to cause a change in momentum.
What is the equation of newton’s second law state when mass is constant?
The resultant force is equal to the rate of change of linear momentum.
Can a rigid body be represented as a particle.
No.
What is a nonhomogeneous rigid body?
The center of mass does not coincide with the volumetric center.
What happens when an unbalanced force is applied to a rigid body made or subcomponents or is nonhomogeneous?
It will cause rotation as well as translation.
Can newton’s second law be applied to a rigid body?
Yes.
What are the conditions for applying newton’s second law?
The law must be applied twice. Once for linear momentum and once for angular momentum.
What is the equation for linear momentum in a rigid body?
The linear momentum relates the resultant force, on an object in any direction to the acceleration, of the object’s centroid in that direction.
What is the linear acceleration resisted by in a rigid body?
By the object’s inertial mass.
What is the equation for angular momentum in a rigid body?
The angular momentum relates the resultant moment or torque, on an object about a centroidal axis to the angular rotational acceleration, around the centroidal axis.
What is the angular acceleration resisted by in a rigid body?
By the object’s centroidal mass moment of inertia.
