General Physics

Running is a means of terrestrial locomotion allowing humans and other animals to move rapidly on foot. It is simply defined in athletics terms as a gait in which at regular points during the running cycle both feet are off the ground. This is in contrast to walking, where one foot is always in contact with the ground, the legs are kept mostly straight and the center of gravity vaults over the legs in an inverted pendulum fashion. A characteristic feature of a running body from the viewpoint of spring-mass mechanics is that changes in kinetic and potential energy within a stride occur simultaneously, with energy storage accomplished by springy tendons and passive muscle elasticity.

Johannes Kepler published his first two laws about planetary motion in 1609 , having found them by analyzing the astronomical observations of Tycho Brahe. Kepler's third law was published in 1619.

The tidal waves on sea is mainly due to gravitational effect of Moon on Earth.

When the pendulum is taken to the moon, the value of 'g' will decrease and hence time period will increase. As the pendulum takes more time to complete one vibration, it will lose time.

"God Particle" is Higgs Boson.

In uniform circular motion, the linear velocity is perpendicular to radius vector.

A flywheel is a rotating mechanical device that is used to store rotational energy. Flywheels have a significant moment of inertia and thus resist changes in rotational speed, enabling the engine to run at a constant, uniform motion. In the Industrial Revolution, James Watt contributed to the development of the flywheel in the steam engine.

Since alpha particle has higher mass than electron, proton and deuteron, its momentum will be maximum.

In automobiles, a bumper is the front-most or rearmost part, ostensibly designed to allow the car to sustain an impact without damage to the vehicle’s safety systems. They are not capable of reducing injury to vehicle occupants in high-speed impacts, but are increasingly being designed to mitigate injury to pedestrians struck by cars.

Brake force, also known as Brake Power, is a measure of braking power of a vehicle. Suppose a car whose mass is ‘x’ and is braked from a speed of y km/hr to come to halt at a uniform retardation in z min. If the speed of the car is doubled in the same distance, then the braking force required to stop the car is four times the original speed i.e. ‘4v’. Note that all the parameters remain to be same.

Power = work / time
= 1000 / 2
= 500 W

By doing more work in less time we can increase the power. And, Power is inversely proportional to time taken to do a work. So, when we do more work in lesser time , power will also increase.

Photovoltaic cell converts light energy to electrical energy.

In a water lifting electric pump, we convert electrical energy into potential energy.

The device which converts sound energy into electrical energy is called microphone.