physics 🤠

Distance (m)

TOTAL length of a path between 2 points

Displacement (m)

Change in position - the distance in a straight from a fixed reference point in a specified direction

Speed (m/s)

Rate at which an object covers distance - the scalar of velocity

Velocity (m/s)

The rate of change of position (can be negative or positive)

Acceleration (m/s²)

The rate at which an object changes it’s velocity

Inelastic collision + TOTALLY inelastic

KE is lost and not conserved in the system but momentum IS conserved

Totally → if objects stick together (total p conserved, not KE)

Elastic collision

Total KE before = Total KE after, all momentum is conserved and all KE is conserved

Potential energy

Energy stored in a source due to its position or arrangement (e.g. up in the sky)

Internal Energy (U)

Energy in all matter due to motion from the particles in it (total sum of microscopic KE and PEs)

Mechanical Energy

The total energy an object possesses due to it’s motion (so KE and PE) (BUT ITS MACROSCOPIC SO BIG ENERGIES)

Power (W)

The rate of transfer of energy

Specific Heat Capacity (J/kg/K or C)

The amount of energy needed to raise the temperature of 1kg of the substance by 1K

Latent Heat (J/kg)

Thermal energy transferred during a change of physical state where temperature is constant

Solar Constant (W/m²)

The intensity of solar radiation passing perpendicularly through an area just above the earths atmosphere

Albedo (a)

The ratio of total reflected (scattered) power to total incident power

Emissivity (e)

The ratio of power radiated per unit area compared to an ideal blackbody

Mole (n - mol)

Amount that contains exactly as many particles as 12g of carbon 12

Impulse (J)

Change in momentum

Temperature (K or C)

Measure of the average KE of particles

Heat Energy

Energy transferred between systems due to a difference in temperature

Blackbody

A perfect emitter or absorber of radiation

Centripetal Force (N)

The NET inward force acting on an object moving in a curved or circular path - directed towards the center of rotation.

When are real gases ideal?

At high temperature and low pressure

Surface area of a sphere?

4piR²

What can Q from Q = mcT and mL be rewritten as?

P x t

If something is stationary, moving constantly, or HOVERING STATIONARY, the resultant force F is…

F=0

What’s w? (Squiggly angle one)

Angular velocity → angle swept in a certain amount of time (change Ø / change time)

Why is temperature constant during state change?

Energy supplied → → increasing potential energy of molecules

Bonds broken rather than change in their KE and since temperature is measured of average KE, it stay same

What is emissivity for blackbodies?

1

What is STP?

Standard Temperature + Pressure (0C or 273K) and (1atm)

How much of a planet absorbs radiation?

Pir² (circle) / 4pir² (SA) = ¼ A QUARTER!!