14. Angular Momentum & Newton's 2nd & 3rd Law Flashcards
What is The Law of Momentum?
The Law of Momentum
Creating a change in the state of motion (dynamic motion)
How does Newton’s 2nd law pertain to Linear Motion?
The rate of change of momentum of a body is proportional to the force causing it and the change takes place in the direction in which the force acts
How does Newton’s 2nd law pertain to Angular Motion?
The rate of change of angular momentum of a body is proportional to the torque causing it and the change takes place in the direction in which the torque acts
What is an Angular Impulse?
A change in angular momentum is produced by an angular impulse
- Angular Impulse = torque x time
- Angular Impulse = Tt
- Units: Nms
Can we write the angular Impulse formula another way?
What average amount of force must be applied by the elbow flexors inserting at an average perpendicular distance of 1.5 cm from the axis of rotation at the elbow over a period of 0.3 s to stop the motion of the 3.5 kg arm swinging with an angular velocity of 5 rad/s when the axis of gyration is 20 cm?
What is newtons second law? How does it differ when comparing Linear vs angular motion?
Linear Motion
A force applied to a body causes an acceleration of that body of a magnitude proportional to the force, in the direction of the force, and inversely proportional to the body’s mass
Angular Motion
A torque applied to a body causes an angular acceleration of that body of a magnitude proportional to the torque, in the direction of the torque, and inversely proportional to the body’s moment of inertia
Why is Newton’s Second Law referred to as the Law of Momentum AND the Law of Acceleration?
How does Newtons 3rd Law relate Angular Motion?
Newton’s 3rd Law relates to angular motion because when one object exerts a torque on another, the second object exerts an equal and opposite torque on the first, ensuring the conservation of angular momentum within a closed system.
Newton’s Third Law
