All Flashcards
What is the effect of doing positive work on an object?
It increases the object's kinetic energy, making it move faster.
What happens to gravitational potential energy when an object is lifted higher?
Its gravitational potential energy increases.
What is the effect of friction on the total mechanical energy of a system?
Friction, a non-conservative force, reduces the total mechanical energy of the system, often converting it to thermal energy.
What happens when a spring is compressed or stretched?
Elastic potential energy is stored in the spring.
What is the difference between conservative and non-conservative forces?
Conservative forces: Work done is independent of the path taken. Non-conservative forces: Work done depends on the path taken and dissipates energy.
Differentiate between average and instantaneous power.
Average power: Total work done divided by the total time. Instantaneous power: The power at a specific moment in time.
What is the Work-Energy Theorem?
The net work done on an object equals the change in its kinetic energy:
Define 'work' in physics.
Work is done when a force causes a displacement.
What is kinetic energy (KE)?
The energy of motion.
What is gravitational potential energy?
Energy due to height above a reference point.
What is elastic potential energy?
Energy stored in a spring when it's stretched or compressed.
What is power?
The rate at which work is done, or the rate at which energy is transferred. or