physics

What is work in physics?

Work is defined as the transfer of energy when a force is applied over a distance. It can be calculated using the formula: Work = Force × Distance × cos(θ), where θ is the angle between the force and the direction of movement.

What is power?

Power is the rate at which work is done or energy is transferred. It can be calculated using the formula: Power = Work / Time.

What is the unit of power?

The unit of power is the watt (W), which is equal to one joule per second (J/s).

How is kinetic energy defined?

Kinetic energy is the energy of an object due to its motion, calculated by the formula: KE = (1/2)mv², where m is mass and v is velocity.

What is gravitational potential energy?

Gravitational potential energy is the energy an object possesses due to its position in a gravitational field, defined by the formula: PE = mgh, where m is mass, g is acceleration due to gravity, and h is height.

Define momentum in physics.

Momentum is the quantity of motion an object has, given by the formula: Momentum = mass × velocity. It is a vector quantity.

What is the principle of conservation of momentum?

The principle of conservation of momentum states that in a closed system, the total momentum before an event is equal to the total momentum after the event, provided no external forces act on it.

What is the relationship between work and energy?

Work done on an object is equal to the change in its energy. When work is done, energy is transferred to or from the object.

What is elastic potential energy?

Elastic potential energy is the energy stored in an object when it is compressed or stretched, calculated using the formula: PE = (1/2)kx², where k is the spring constant and x is the displacement from equilibrium.

What happens to energy in inelastic collisions?

In inelastic collisions, kinetic energy is not conserved, but momentum is conserved. Some kinetic energy is transformed into other forms of energy, such as thermal energy or sound.