Physics Review Flashcards

Flashcards from Physics Lecture Notes

Attractive or Repulsive Forces

Magnetic and electric forces can be either attractive or repulsive, while gravitational force is always attractive.

Sound Wave Energy Transfer

When a sound wave travels, it only carries energy.

Electric Current and Magnetic Field

When an electric current passes through a metal wire, it results in a magnetic field.

Resonance

Vibration caused due to other vibration (or in the case of a tuning fork) is due to resonance.

Destructive Interference

Destructive interference is the subtraction of two waves.

Sound Wave Particle Motion

In a sound wave, particles always travel parallel to the wave (in the same direction as the wave).

Experimental Value of g

If the experimental value of g does not match the universal value of 9.81 m/s², it might be due to errors in measuring distance or time.

Projectile Range

A projectile travels the farthest when thrown at a 45° angle.

Projectile Air Time

A projectile stays in the air for a longer period of time when the angle is the greatest.

Scalar Quantities

Distance, Speed, Mass, Time, Temperature, Work, Energy, Power, Potential Difference, and Charge are scalar quantities.

Vector Quantities

Displacement, Velocity, Force, Acceleration, Momentum, Impulse, and Electric Field are vector quantities.

Freely Falling Block

When a block falls freely, its acceleration remains constant (same as gravity) and its speed increases.

Inertia

Inertia only depends on mass; the more the mass, the greater the inertia.

Change in Speed

An unbalanced force is required to change the speed of a body.

Equilibrium

An object is in equilibrium if it is at rest/not moving/stationary.

Electromagnetic Waves

Electromagnetic waves do not require any medium to travel and can travel in space.

Doppler Effect (Sound)

As a sound source travels from point A to point B, point B experiences a higher frequency and an increase in amplitude.

Diffraction

Diffraction occurs when a wave passes through a hole/slit/barrier/gap/opening.

Thermal/Internal Energy

Thermal/Internal Energy only depends on friction. No friction means no thermal energy; friction increases thermal energy as the object moves.

Constant Kinetic Energy

Kinetic energy remains constant if velocity/speed is constant.

Constant Gravitational Potential Energy

Gravitational Potential energy remains constant if the object moves on a level floor (no change in height).

Reflection of Light

When a light ray is reflected, it bounces back with the same angle as the angle of incidence.

Conductivity vs. Resistivity

Conductivity is the opposite of resistivity; the less the resistivity of a material, the more its conductivity.

Law of Reflection

The angle of incidence is equal to the angle of reflection.

Electrostatic Force (Charges)

When two positive charges are brought closer together, the electrostatic force between them is repulsive and it increases.