Forces

                                                                         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 friction to slow you down . Contact forces include friction, air resistance, water resistance and  up thrust (the force that makes things float).

Some forces can affect an object from a distance. these are call non-contact forces. Gravity is a force that pulls objects down wards. Static electricity can attract things. For example a man is climbing the side of a ship using magnets. Magnets have magnetism which attracs objects made from iron and some other metals.

Comments

Post a Comment

Popular posts from this blog

Solar System

Image
                                                                  Science sun The Sun  is the only star in our solar system. It is the centre of our solar system, and its gravity holds the solar system together. its   Temperature: 5,973°C to 15,000,000°C.               mercury At a distance of only about 1/3 of Earth's distance to Sun, Mercury is the first planet in our Solar System . With a diameter of only 4880 kilometres (3032 miles) Mercury is the smallest planet in the Solar System. It is barely bigger than our Moon. Not only is Mercury the smallest planet, it is also shrinking! Venus Venus is the second closest planet to The Sun. It is the hottest planet in the Solar System. There are yellow clouds on Venus. Venus is the only planet in our Solar System that r...
Read more

Forces

Image
                                                                    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 ...
Read more

State Of Matter

Image
                                                       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 ...
Read more