All Flashcards
What is the effect of applying an external force to a system?
The system accelerates according to Newton's Second Law ().
What happens when a system is closed?
There is no exchange of matter or energy with the surroundings.
What happens when the net external force on a system is zero?
The system remains at rest or continues to move with constant velocity.
What happens when the force applied to a block increases?
Greater acceleration.
What happens when a force is applied opposite to the motion?
Velocity decreases.
What are the steps to analyzing a system using Newton's Second Law?
- Define the system. 2. Identify external forces. 3. Calculate net external force. 4. Apply ΣF = ma to find acceleration.
What are the steps to solving a problem involving a box on an incline?
- Define the system (box, incline, etc.). 2. Identify external forces (gravity, normal force). 3. Apply ΣF = ma. 4. Calculate normal force (N = mg*cos(θ)).
What is the definition of a system in physics?
A collection of objects we're choosing to analyze together.
What is a closed system?
A system with no exchange of matter or energy with its surroundings.
What is an open system?
A system that exchanges matter and/or energy with its surroundings.
What is equilibrium?
A state where there is no change over time.
What is dynamic equilibrium?
Changes occur, but the system returns to equilibrium.
What are quarks?
The smallest units of matter that make up protons and neutrons.