FORCE AND FRICTION MEANING:
What is a force ?
A force is a push or a pull that gets something moving or changes the way it moves. Flicking a marble creates a force that sends the marble rolling across the table. Putting out your hand to stop it falling off the table’s edge creates a force that sends it’s spinning in another direction. If the marble rolls off the table, gravity pulls it to the ground- another force, of course!
What is a friction ?
According to Newton’s first law, a rolling ball ought to go on rolling for ever, but it actually slows down and stops. That’s because there’s another force stopping it- friction. Friction is the rubbing force created between a moving object and whatever it touches.
Forces and friction laws|Newton’s laws of motion
Sir Isaac Newton’s three laws of motion, often called Newton’s Laws, explain how forces make objects move. Legend has it that an apple fell on Newton’s head while he was sitting under a tree, which led to his discoveries about motion and gravity.
Force and friction:-Newton’s first law
An object will stay still or move along at the same speed and in the same direction unless a force acts upon it. This law is sometimes referred to as the law of inertia.
In action: If you brake too hard on your bike, you may go flying over the handlebars. The force exerted by the brakes has stopped the bike, but you keep moving forwards at the same speed.
Force and friction:- Newton’s Second law
The amount an object’s speed or direction changes depends on its mass and the size of the force acting upon it.
In action: If you exert a force on a marble by pushing it, it begins to move. But it takes more force to move a heavier object or to move something faster. So if you push a giant boulder it won’t move so far.
Force and friction:- Newton’s third law
Whenever a force acts, an equal force acts in the opposite direction.
In action: when you jump, you push the ground with your feet, and the ground pushes back, propelling you into the air.
Four Reasons why Friction is useful
✓Friction produces heat. For thousands of years, humans have rubbed dry sticks together to make fire.
✓The patterned tread on tyres creates a rough surface to increase friction, so they don’t slip on smooth surfaces.
✓The ridges of your fingerprints create friction between of your fingers and whatever you are holding, helping you grip.
✓Brakes rubbing against moving wheels create friction, which causes the wheels to slow down.
Here are some facts about force and friction for more information just in case if you are wondering about others:
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