What is work in physics?
Work is done when a force acts on an object and causes it to move in the direction of the force. Mathematically, W=F×d, where W is work, F is force, and d is the distance moved.
What is power in physics?
Power is the rate at which work is done or energy is transferred. It is given by P=tW, where P is power, W is work, and t is time.
What is energy in physics?
Energy is the ability to do work. It exists in various forms, including kinetic, potential, thermal, chemical, and more.
What is static electricity?
Static electricity is the build-up of electric charge on the surface of objects, typically caused by friction.
What is Newton's First Law of Motion?
Newton's First Law of Motion, also known as the Law of Inertia.
What units are used to measure work?
The unit of work is the joule (J)
units are used to measure power?
The unit of power is the watt (W)
What are the different forms of energy?
The main forms of energy include kinetic energy, potential energy, thermal energy, chemical energy, and electrical energy.
What causes static electricity?
Static electricity is caused by the transfer of electrons between two objects, usually through friction, which leads to a net positive or negative charge.
What is inertia?
Inertia is the property of matter that resists changes in its state of motion. The greater the mass of an object, the greater its inertia.
What is the formula for calculating work?
The formula is W=F×d×cos(θ), where θ is the angle between the direction of the force and the direction of displacement.
How do you calculate the power of an engine?
The power of an engine can be calculated by dividing the work done or energy supplied by the time taken: P=tW.
How is energy measured?
The unit of energy is the joule (J), which is the same as the unit for work.
What is the unit of charge in static electricity?
The unit of electric charge is the coulomb (C).
What is Newton's Second Law of Motion?
Newton's Second Law of Motion states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
When is work considered to be zero?
Work is zero if the force applied does not cause any displacement (e.g., pushing against a wall that doesn't move).
How does power affect the speed of an object?
A higher power output generally leads to a faster speed if the force applied is the same, because the work is done more quickly.
Can energy be transferred?
What is the role of an insulator in static electricity?
Insulators prevent the flow of electric charge, allowing static electricity to build up on surfaces.
What is Newton's Third Law of Motion?
Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction.
Can work be done without energy?
No
What is the formula for average power?
Average power is calculated as Pavg=ΔtΔE, where ΔE is the change in energy and Δt is the time interval.
What is kinetic energy?
Kinetic energy is the energy possessed by an object due to its motion. It is given by KE=21mv2, where m is mass and v is velocity.
Can static electricity cause damage?
Yes.
What is the difference between mass and weight according to Newton’s laws?
Mass is the measure of the amount of matter in an object and does not change regardless of location. Weight is the force exerted by gravity on an object, and it depends on the gravitational field strength.