4.kinetic energy:The kinetic energy of an object is the extra energy which it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its current velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. Negative work of the same magnitude would be required to return the body to a state of rest from that velocity

energy

energy

it aforce that help living things, and human being to move, to grow and to subsist



tipes of energy:


1.chemical energy:Chemical energy is potential energy until the chemical reaction puts atoms and molecules in motion. Heat energy (KE) is often the result of a chemical reaction.

2. heat energy:Heat is the movement of molecules. It is the sum of the kinetic energy of an object's molecules. In many physics textbooks, they look at heat as some sort of substance and heat energy as something independent of kinetic energy. In our lessons, it is just one subset of kinetic energy

3.electric ennergy:Electrical energy is the movement of electrons. That is kinetic energy. The voltage in an electrical circuit is the potential energy that can start electrons moving. Electrical forces cause the movement .

enegy

6.light energy:Light is the movement of waves and/or light particles (photons). It is usually formed when atoms gain so much kinetic energy from being heated that they give off radiation. This is often from electrons jumping orbits and emitting moving photons.

7.nuclear energy:Certain elements have potential nuclear energy, such that there are internal forces pent up on their nucleus. When that potential energy is released, the result is kinetic energy in the form of rapidly moving particles, heat and radiation

general properties of matter

mass:

There are four different properties of matter. They are weight, volume, mass, and density. The most important one is mass. Mass is the amount of matter in an object and it never changes unless matter is taken out of the object. Mass also has a direct relationship with inertia. Inertia is the resistance of motion of an object. If an object has a greater mass, then it has a greater inertia. Also, you can find mass by measuring it on a triple beam balance.
Volume: is another general property of matter. Anything that takes up space has volume. In fact, volume is the amount of space an object takes up. You can find a straight-edged object's volume by measuring the Length x Width x Height. For irregular shaped objects, you'd probably want to use a graduated cylinder. Liters and milliliters are used to measure the volume of liquids, while cubic centimeters are used to measure solids.
Density:The third general property of matter is density. Density is very important because it enables you to compare different objects. For instance, water has a density of 1 gram/cc and wood is 0.8 grams/cc. Therefore, wood will float in water because it's density is less than that of water. The equation for density is Density=Mass/Volume. Also, if you split an object in half, it will still have the exact same density.
Weight:Weight is the fourth general property of matter. It is defined as the measure of force of attraction between objects due to gravity. Gravity is what keeps you and me on the ground. In fact, gravity exists between you and your computer. You are attracted to it by gravity. You don't feel the attraction because the computer's mass is so small. The earth, on the other hand has a very large mass. That's why you are attracted to the ground. Weight, unlike mass, changes with location. The farther you are from the center of the Earth, the less you weigh. The metric unit for weight is the newton, even though in America the most common unit is the pound. The equation for weight is Weight=Mass x Acceleration due to gravity, but I personally think the easiest one is for every kilogram of mass, there's 9.8 newtons of weight.

matter

In physical science, mass refers to the degree of acceleration a body acquires when subject to a force: bodies with greater mass are accelerated less by the same force. One says the body of greater mass has greater inertia. The mass of an amount of matter in a chemical substance is determined in part by the number and type of atoms or molecules it contains, and in part by the energy involved in binding it together (which contributes a negative "missing mass," or mass deficit). According to special relativity, energy also has mass according to the principle of mass–energy equivalence as exemplified in the process of nuclear fusion and the bending of light.[1]
Inasmuch as energy is conserved in closed systems in relativity, the relativistic definition(s) of mass are quantities which are conserved also; they do not change over time, even as some types of particles are converted to others.
In everyday usage, mass is commonly confused with weight. But, in physics and engineering, weight means the strength of the gravitational pull on the object; that is, how heavy it is, measured in units of newtons. In everyday situations, the weight of an object is proportional to its mass, which usually makes it unproblematic to use the same word for both concepts. However, the distinction between mass and weight becomes important for measurements with a precision better than a few percent (due to slight differences in the strength of the Earth's gravitational field at different places), and for places far from the way surface of the Earth, such as in space or on other planets.

*A tropism is a plant produced by the action of hormones, compared to an external stimulus. The plants have no sense organs. Nor can move to change the environment that surrounds them, is growing too slowly in a certain direction they may be: Positive when the plant grows toward the stimulus Negative when the direction is opposite
*Nastia is a certain areas of a plant compared to an external stimulus and diffuse, based on processes of growth or change in the turgidity of groups of cells that vary in volume by controlling the entry and exit of water movement result is not influenced by the direction of the stimulus.
*The reaction electrotropismo orientation of some animals in relation to an electric field.
*The hidrotropismo corresponds to a movement to plant wetlands, where the water. Given this root stimulation a clear positive response.
*The incentive is that geotropismo on the gravitational force of the bodies. Ie, the stems always grow up to find the necessary light for photosynthesis, the roots into the soil, there you will find water and minerals.
*Phototropic reaction is the ability or by hormones, a plant to change the direction of its normal growth occurs when the light changes, as in growth, the light is very important and also in carrying out photosynthesis, rioja which leads us to conclude that in response to this stimulus, the plant grows toward the light source

answer

energy:

many smaall clildren seen to have an endless supply of energy .this usually leaves their parents feeling in turn that they have very little energy!our bogquies need a constant supply of energy from the food we eat in oder to wor properly.different froms of energy are all around us. energy is constadatly being changed from one form into onother

material systems:
when our oncestors first mode things ; they used the materials they found around them such as rochs, wood;bone; and animalsslhing