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.
What is the effect of pushing on a wall?
The wall exerts an equal and opposite force back on you.
What happens when internal forces act within a system?
The motion of the system's center of mass does not change.
What happens when an external force acts on a system?
The motion of the system's center of mass changes.
What is the effect of pulling on an ideal string?
Tension is created uniformly throughout the string.
What is the effect of pulling on a non-ideal string?
Tension is created, but it is not uniform throughout the string; it is greater at the top.
What is the effect of an external force on a system?
It changes the motion of the system's center of mass.
What is the effect of the weight of a real string on the tension?
The tension varies along the length of the string, usually being maximum at the top.
What is the effect of pushing on a wall?
The wall pushes back on you with an equal and opposite force.
What is the effect of internal forces acting within a system?
They cancel each other out and do not affect the motion of the system's center of mass.
What is the effect of using multiple ideal pulleys in a block and tackle system?
They multiply the applied force, making it easier to lift heavy loads.