Last Minute Physics flashcards

Read before entering the exam room

Newton’s universal law of gravitation

The force of gravity between two objects is inversely proportional to the square of the separation of their ceters and force is directly proportional to the product of their masses.

When do astronauts in space stations feel weightless?

The centrpetal force is the gravitational force between the earth and space station. Both the astronaut and the space station have the same acceleration. The acceleration is the ravitational field strength at that position.

Traverse waves and examples

They cause the medium to move perpendicular to the direction of the wave (examples: water waves and S earthquakes)

Longitudinal waves and examples

They cayse the direction of the particles to be parallel to the direction of the wave (eg. sound waves)

Why do a finite number of energy levels exists?

Photons

Snell’s law