Cheatography

Tahsili Physics (Energy and Machines) Cheat Sheet by TheGoldenClover

2023 Tahsili Physics, energy and machines

System Types

 open system can gain and lose mass and energy closed system a system that does not gain nor lose mass Isolated system a sytem that does not exchange mass nor energy

Momentum and Impulse

 impulse (I) I or ΔP = FΔt impulse unit N.s Location on a graph under the Force - Time curve Momentum P = mv Law of Conser­vation Of Momentum m1v1 + m2v2 = (m1+m2)v in any closed or isolated system, the momentum is conserved impulse is the change in momentum, so I = ΔP

Kinetic Energy

 KE Formula KE = (1/2)mv2 work-e­nergy theorem work is equal to the change in KE ( W = KEf - KEi )

Potential Energy

 Gravit­ational Potential Energy energy stored as a result of the gravit­ational attraction of the earth on the object Formula PE = mgh Elastic Potential Energy the energy stored in elastic materials as a result of their stretching or compre­ssing

Machines

 Simple Machine a machine that makes work easier by changing the value of force or its direction compound machine a device that uses multiple simple machines Mechanical advantage Fr / Fe (resis­tance force / effort force) Ideal Mechanical Advantage de / dr (effort displa­cement / resistance displa­cement) Compound Mechanical Advantage the product of the MA of its simple machine components Efficiency (W output / W input) x 100% or (MA / IMA) x 100% Types of simple machines pulley - lever - wedge - incline plane - screw

Collision Types

 Inelastic collision the kinetic energy after the collision is less than it originally was elastic collision the kinetic energy remains the same after the collision super elastic collision the kinetic energy increases after the collision kinetic energy decreases when the objects stick together

Work

 Work the transl­ation of energy in mechanical ways Work Formula Fdcos(θ) Work Unit J Location on graph under the force - displa­cement curve Work done by Friction -fk x d Work done by Gravity mgd Work = 0 when the force is perpen­dicular to the displa­cement (90 degrees) W is positive if the work is done on the system W is negative if the work is done by the system

Mechanical Energy

 mechanical energy the sum of the potential and kinetic energies

Power

 Power P = W/t Power Unit Watt = kg.m2/s3

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