Science Review Shit Flashcards
What is work and it’s unit?
When a force is applied to an object and the object moves in the same direction as the applied force
J= n - m = kg - m 2/s 2
What is energy and its units?
The capacity to do work
Unit of evergy is Jules
What does grav. Potential energy depend on?
Mass and height
What is the difference between kinetic and potential energy?
Potential- results from the relative positions of objects in a system
Kinetic- depends on both mass and speed
What is a machine and how do machines make work easier?
by changing the size of an input force, the direction of the force or both
What is measured in watts?
Power
Do machines decrease the amount of energy needed to do work?
No
What describes energy conservation?
Energy cannot be created or destroyed but transferred
What is measured in Joules?
Energy or work done
If nothing moves has work been done?
No
What measures the rate at which work is done?
Power
The sum of all the kinetic and potential energy in a system is called what?
Mechanical energy
Energy is going to be transferred as_____ when mechanical energy decreases and temperature increases
Heat
How do you calculate power?
Power= work/time
What is the unit for power?
Joule
