All Flashcards
What is Newton's Third Law?
For every action, there is an equal and opposite reaction.
Define internal forces.
Forces between objects within a system.
Define external forces.
Forces between an object in the system and something outside the system.
What is tension?
The pulling force transmitted through a string, cable, or similar object when it's pulled tight.
What is an ideal string?
An ideal string has negligible mass and doesn't stretch.
What is an ideal pulley?
A simple machine that changes the direction of a tension force with negligible mass and friction.
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?
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.