All Flashcards
What is the difference between internal and external forces?
Internal forces: Act within a system, do not affect COM motion. | External forces: Act on the system from outside, can change COM motion.
What is the difference between ideal and non-ideal strings?
Ideal strings: Negligible mass, do not stretch, uniform tension. | Non-ideal strings: Have mass, can stretch, non-uniform tension.
How do gravitational forces differ between AP Physics 1 and AP Physics 2?
AP Physics 1: Focuses on gravitational forces only. | AP Physics 2: Includes gravitational, electric, and magnetic forces.
Define Newton's Third Law.
For every action, there is an equal and opposite reaction.
What is an internal force?
A force between objects within a system.
What is an external force?
A force between an object in the system and something outside the system.
Define tension.
The pulling force transmitted through a string, cable, or similar object when it's pulled tight.
What is an ideal pulley?
A simple machine that changes the direction of a tension force.
What is the effect of an external force on a system's center of mass?
It changes the motion of the center of mass.
What is the effect of the weight of a real string on the tension?
The weight causes the tension to vary along the length of the string.