Science

                                                       State Of Matter What is the 3 state of matter? There are three states of matter: solid; liquid and gas. They have different properties, which can be explained by looking at the arrangement of their particles. Solids ... Solids have a fixed shape and fixed volume, which means they don't move to fill a container when they're placed in it. They hold their own shape and volume. Solids cannot be compressed into a smaller space very easily. There's not much space between the  atoms. Most solids change their shape if they are squeezed or pulled with enough force . The particles in the solid cannot move closer together, but they can often slide around and past each other if they are pushed hard enough. Thin bars and sheets of solids can often be bent or moulded. Liquids ... The atoms in ...

                                                                       Sound What is sound? In physics, sound is  a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid . In human physiology and psychology, sound is the reception of such waves and their perception by the brain.  Sound is created when something vibrates and sends waves of energy (vibration) into our ears. The vibrations travel through the air or another medium (solid, liquid or gas) to the ear. The stronger the vibrations, the louder the sound. What are the 3 types of sound? Sound waves are characterized into three types. Audible sound waves are those that humans can hear. Infrasonic waves are those that are too low-frequency (below 20 Hz) for humans to hear. Ultrasonic sounds wav...

                                                                          Forces   Our life is full of forces. We cannot see them but we can see how they affect things. All sports involve forces. You can use a force when you run or when you ride a bike.  When you take part in certain sports you need special equipment to protect you from some  forces or help you to produce bigger  forces. Many sports would not be possible without modern technology.   For many  forces, the thing provided the  force needs to touch an object before the  force can affect it. These are called contact forces. For example when you throw a ball, you need to touch it to exert a force on it. When you need to go down a steep hill on a bicycle, the brakes need to touch the wheel to produce frict...

                    Movement And Joints Fixed joints:  Synarthroses (immovable joints), also known as fixed or fibrous joints, are defined as  two or more bones in close proximity that have no movement . An example of immovable joints are the plates of the skull.  The joints in which bones cannot move or bend are called immovable or fixed joints. Examples include  skull bones, teeth in sockets of jaw. Moveable joints A moveable is a joint that can move below would be the examples of moveable joints:  Hinge joint: Hinge joints are  a type of joint that functions much like the hinge on a door, allowing bones to move in one direction back and forth with limited motion along other planes . The fingers, toes, elbows, knees, and ankles contain hinge joints. Hinge joints are complex and contain many muscles and tissues. Pivot joints:  pivot joint, also called rotary joint, or trochoid joint, in vertebrate anat...

                                                                    Forces What is a force? A force is The push or pull on an object with mass causes it to change its velocity . Force is an external agent capable of changing a body's state of rest or motions It has a magnitude and a directions. They are measured in Newtons.     types of force .. . Gravitational force.-    a force of attraction (attractive force) that attracts all physical forms having mass Non-contact forces- they pull or push on objects without touching them Magnetic force.-  attraction or repulsion that arises between electrically charged particles because of their motion Nuclear force.-  a force that acts between the protons and neutrons of atoms . Frictional force.-  t he force that resists motion when the surface ...