Physics and Astronomy Quiz

Magnetic Fields

• The direction of a magnetic field can be identified by the direction towards which the north pole of a compass needle points.
• The magnitude of the magnetic field around a permanent magnet is greatest closest to the poles.

Kepler's Laws

• Kepler's third law states that the cube of the orbital period is proportional to the cube of the orbit's semimajor axis.

Astronomy

• One astronomical unit is equal to the average distance between Earth and the sun, which is approximately 1.496 x 10^8 km.

Electric Current

• Electrons move through a metal conductor in zigzag patterns due to repeated collisions with the vibrating metal atoms.
• An increase in electric field strength will increase the drift velocity of electrons in a wire.

Gravitational Force

• The equation for gravitational force is an inverse-square relationship, meaning the force of gravity is inversely proportional to the square of the distance.
• The constant of universal gravitation is represented by the symbol G.

Magnetization

• Ferromagnetic material can become magnetized by being placed in the presence of a permanent magnet.
• When a bar magnet is broken into halves, each piece will turn into a bar magnet with its own north and south poles.

Orbital Motion

• The gravitational force between an object and a planet is affected by the distance between them, with a greater force at shorter distances.
• The speed of an object in circular orbit is calculated by the equation vt=Gmrv_t = \sqrt{\frac{Gm}{r}}vt​=rGm​​, where m represents the mass of the central object.

Energy and Motion

• When a satellite is redirected to a lower orbit, its potential energy will decrease, while its speed and kinetic energy will increase.

Electric Circuits

• The delay time before a light turns on when a switch is flipped is determined by the drift speed of the electrons in the wire.
• The energy stored in a battery is considered electrical energy because it is stored in chemical bonds.

Magnetic Fields

• The direction of a magnetic field can be identified by the direction towards which the north pole of a compass needle points.
• The magnitude of the magnetic field around a permanent magnet is greatest closest to the poles.

Kepler's Laws

• Kepler's third law states that the cube of the orbital period is proportional to the cube of the orbit's semimajor axis.

Astronomy

• One astronomical unit is equal to the average distance between Earth and the sun, which is approximately 1.496 x 10^8 km.

Electric Current

• Electrons move through a metal conductor in zigzag patterns due to repeated collisions with the vibrating metal atoms.
• An increase in electric field strength will increase the drift velocity of electrons in a wire.

Gravitational Force

• The equation for gravitational force is an inverse-square relationship, meaning the force of gravity is inversely proportional to the square of the distance.
• The constant of universal gravitation is represented by the symbol G.

Magnetization

• Ferromagnetic material can become magnetized by being placed in the presence of a permanent magnet.
• When a bar magnet is broken into halves, each piece will turn into a bar magnet with its own north and south poles.

Orbital Motion

• The gravitational force between an object and a planet is affected by the distance between them, with a greater force at shorter distances.
• The speed of an object in circular orbit is calculated by the equation vt=Gmrv_t = \sqrt{\frac{Gm}{r}}vt​=rGm​​, where m represents the mass of the central object.

Energy and Motion

• When a satellite is redirected to a lower orbit, its potential energy will decrease, while its speed and kinetic energy will increase.

Electric Circuits

• The delay time before a light turns on when a switch is flipped is determined by the drift speed of the electrons in the wire.
• The energy stored in a battery is considered electrical energy because it is stored in chemical bonds.