All Flashcards
Steps to calculate the speed of a block at the bottom of a frictionless ramp using conservation of energy?
- Equate initial potential energy to final kinetic energy: . 2. Solve for v: .
Steps to calculate the potential energy stored in a spring?
- Use the formula for potential energy in a spring: , where k is the spring constant and x is the compression/extension distance.
Steps to calculate work done by friction?
- Calculate the normal force (N). 2. Calculate the frictional force: . 3. Calculate work: .
Steps to apply the work-energy theorem?
- Identify all forces doing work. 2. Calculate the work done by each force. 3. Calculate the net work: . 4. Solve for the unknown (e.g., final velocity).
Steps to calculate the average power output?
- Calculate the work done or energy transferred (W or ). 2. Measure the time (t) over which the work is done. 3. Calculate power: or .
What is the difference between energy and power?
Energy is the capacity to do work, while power is the rate at which energy is transferred or work is done.
Differentiate between kinetic and potential energy.
Kinetic energy is the energy of motion; potential energy is stored energy due to position or configuration.
Compare conservative and non-conservative forces.
Conservative forces (e.g., gravity) conserve mechanical energy; non-conservative forces (e.g., friction) dissipate energy as heat.
What are the differences between work and energy?
Work is the transfer of energy from one system to another, while energy is the capacity to do work.
Define the Law of Conservation of Energy.
The total energy of an isolated system remains constant; energy can change forms but is neither created nor destroyed.
What is Total Mechanical Energy (TME)?
The sum of potential (U) and kinetic (K) energies in a system: .
Define the Work-Energy Principle.
The net work done on an object equals its change in kinetic energy: .
What is Power?
The rate at which work is done or energy is transferred: or .
What are the units for Power?
Watts (W), equivalent to joules per second (J/s).
What is kinetic energy?
Energy possessed by an object due to its motion.
What is potential energy?
Energy stored in an object due to its position or condition.