What is understood by work?
Work, in physics, measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement. If the force is being exerted at an angle θ to the displacement, the work done is W = fd cos θ.
Why is t used for kinetic energy?
Kinetic energy is sometimes represented by the letter T. This probably comes from the French travail mécanique (mechanical work) or quantité de travail (quantity of work).
What makes ice float on water?
What’s so special about ice that causes it to float? Believe it or not, ice is actually about 9% less dense than water. Since the water is heavier, it displaces the lighter ice, causing the ice to float to the top.
What is the relation between kinetic energy?
There is a relation between kinetic energy and momentum as both the properties are linked with velocity. Momentum gets expressed as a multiplication of velocity and mass, whereas kinetic energy is the product of the square of speed and half of the mass.
How can energy be consumed when no work is done?
This energy comes from the chemical energy in your body and most of them are converted into heat and lost to the surrounding. In this situation, no energy is transferred to the book, so no work is done. You can feel the different energy consumption when your arm is stretched in different angle.
What is the kinetic theory of liquids?
Liquids have more kinetic energy than solids. When a substance increases in temperature, heat is being added, and its particles are gaining kinetic energy. Because of their close proximity to one another, liquid and solid particles experience intermolecular forces. These forces keep particles close together.
Which of the following is highest kinetic energy?
What is the best explanation of work?
What is the best explanation of work? Work occurs when a force acts on an object and causes a displacement of that object.
How does the kinetic theory explain how water changes into water Vapour?
If a liquid is heated the particles are given more energy and move faster and faster expanding the liquid. The most energetic particles at the surface escape from the surface of the liquid as a vapour as it gets warmer. Liquids evaporate faster as they heat up and more particles have enough energy to break away.
Why does ice floats on water class 9?
Ice floats because it is 9% less dense than water. In other words, ice takes 9% more space than water, so one litre of ice is less than one litre of water.
What are the two main ideas in the kinetic theory of matter?
The simplest kinetic model is based on the assumptions that: (1) the gas is composed of a large number of identical molecules moving in random directions, separated by distances that are large compared with their size; (2) the molecules undergo perfectly elastic collisions (no energy loss) with each other and with the …
Is kinetic energy equal to momentum?
Some people think momentum and kinetic energy are the same. They are both related to an object’s velocity (or speed) and mass, but momentum is a vector quantity that describes the amount of mass in motion. Kinetic energy is a measure of an object’s energy from motion, and is a scalar.
What does the kinetic theory explain quizlet?
Kinetic energy is energy in the form of movement; Kinetic theory is based on all particles of matter moving. In science, temperature is the average kinetic energy of matter. More kinetic energy = Hotter. Less kinetic energy = Colder. You just studied 13 terms!
What is the correct definition of energy?
What is the correct definition of energy? the ability to do work. Which type of energy is stored in chemical compounds and released in chemical reactions? chemical energy. Which type of energy is the energy of motion?
Is kinetic energy is scalar?
Kinetic energy is a scalar quantity; it does not have a direction. Unlike velocity, acceleration, force, and momentum, the kinetic energy of an object is completely described by magnitude alone. Like work and potential energy, the standard metric unit of measurement for kinetic energy is the Joule.
Is work the same as power?
Work is the energy needed to apply a force to move an object a particular distance, where force is parallel to the displacement. Power is the rate at which that work is done.
How does the kinetic molecular theory of matter explain diffusion in liquids?
The kinetic molecular theory of matter states that: The average amount of empty space between molecules gets progressively larger as a sample of matter moves from the solid to the liquid and gas phases. There are attractive forces between atoms/molecules, and these become stronger as the particles move closer together.
Why is kinetic energy scalar?
Kinetic energy is a scalar because it does not require direction to define it. The kinetic energy is given as (½)mv2. Here m is the mass which is a scalar quantity and v is the velocity which is a vector. The square of a vector quantity is a scalar.
What’s the definition for kinetic energy?
Kinetic energy, form of energy that an object or a particle has by reason of its motion. If work, which transfers energy, is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy.
Is work done equal to kinetic energy?
The principle of work and kinetic energy (also known as the work-energy theorem) states that the work done by the sum of all forces acting on a particle equals the change in the kinetic energy of the particle. This relationship is generalized in the work-energy theorem.
What factors affect the kinetic energy?
1. Explain that there are two factors that affect how much kinetic energy a moving object will have: mass and speed. Have students complete this demonstration to learn how mass influences an object’s kinetic energy.
What does the kinetic theory state?
The kinetic theory of matter (particle theory) says that all matter consists of many, very small particles which are constantly moving or in a continual state of motion. The degree to which the particles move is determined by the amount of energy they have and their relationship to other particles.