Hidden forces are regularly at play in our day-to-day life. A force is any pull or push. Forces can change an object's speed or direction of motion or can cause it to change shape. English scientist Isaac Newton figured out how forces affect movement ( motion ) over three hundred years ago. His principles are still applied in many fields of science, engineering, and daily life.
WHAT IS A FORCE?
The push or pull of an object is known as Force. Although you cannot see a force, you can often see what it does. A force can change the speed, direction, or shape of an object by changing the amount of energy that it has. Forces cause motion, but forces don't always make things move - balanced forces are essential for building stability.
Different types of force with examples -
1. CONTACT FORCES
When an object comes into contact with another and exerts a force, this is called contact force. Either a push or a pull, this force changes the object's direction, speed, or shape.
When players bounce balls against walls during practice, the walls exert a force on the balls that changes their direction.
The force applied changes the ball's speed when a player kicks, back heels, or volleys a soccer ball.
Kicking or stepping on the soccer ball applies a force that momentarily squashes it, changing the shape of the ball.
2. NON-CONTACT FORCES
Gravity, a force of attraction between objects with mass, keeps us on the ground. Everything in the universe pulls on every other object.
A magnet creates a magnetic field around it. If a magnetic material is brought into the field, it will experience a force.
A charged object creates an electric field; another charged object is moved into a field and a force act on it.
SOME IMPORTANT TERMS AND DEVICES
WEIGHT, GRAVITY, AND MASS
Mass is not the same as weight, which measures how much matter is in an object. Mass is the force acting on the matter and is the result of gravity. The weight of an object can change depending on where you are on earth and other factors such as temperature.
You can measure force using a force meter containing a spring connected to a metal hook. The spring stretches when force is applied to the hook. The bigger the force, the longer the spring stretches, and the bigger the reading the unit of the force is the Newton ( N ).
Mass is measured in kilograms ( kg ). Weight can be calculated as mass × gravity ( N/Kg ). The pull of gravity at the earth's surface is roughly 10 N/Kg, so an object with a mass of 1 Kg weighs 10 N.
BALANCED AND UNBALANCED FORCES -
Not all forces acting on an object make it move faster or in a different direction. The force of gravity keeps any bridge from moving because the support underneath it balances the structure's weight. In a tug of war game, if both sides have equal amounts of force, then no one will win; if there were one team that used too much force, they would win the battle.
If two forces acting on an object are equal in size but opposite in direction, they cancel each other out. A stationary object will stay still, and an object in motion will keep moving at the same speed in a straight line.RESULTANT FORCE:
When opposite teams pull with equal force, the resultant force is 0 N.
If two forces acting on an object are not equal, the object will move. If an object is moving, it will change speed or direction.RESULTANT FORCE:
One team pulls with greater force than the other. The resultant force is 100 N.
DEFORMING FORCES -
When a force acts on an object that cannot move, or when several different forces act in different directions, the whole object changes shape. The way an object distorts depends on the number, directions, and strengths of the forces acting upon it and on its structure and composition—if it is elastic (returns to its original shape) or plastic (deforms easily but does not return to its original shape). Materials that are brittle fracture creep or fatigue if forces are applied to them.
When two or more forces act in opposite directions and meet an object, it compresses and bulges.
When two or more forces act in opposite directions, one pulling on an elastic object and the other pushing away, the object will stretch.
Turning forces or torque that act in opposite directions twist the object.
When several forces act on an object in different places, the object bend ( if malleable ) or snaps.
Instead of just moving or accelerating an object along a line or sending it off in a straight line in another direction, forces can also be used to turn an object around a point known as access or pivot. This kind of force work on wheels, seesaws, and fairground ride such as carousels.
When a force acts to turn an object around a pivot, the effect of that force is called its moment of inertia. The turning effect of a force depends on how far away from the pivot it is acting and how big the force is. Calculate N × m. The measuring unit is called a Newton meter (Nm).
A constant force must be applied to keep an object turning in a circle, obeying Newton's first law of motion. Known as centripetal force, it pulls the turning object toward the center of rotation-imagine a yo-yo revolving in a circle on its string-continually changing its direction while the motion changes its speed. If there were no force acting on an object, it would move in a straight line away from the center.
Here I have covered Different types of force with examples as contact force and non contact force. We had defined contact force as changing speed/direction/shape and non contact forces as gravitation, magnetism, and static electricity. Furthermore, we learned about some important terms and devices and then covered the rest of the forces like tension, torsion, bending, moment etc. I hope now you know about Different types of force with examples.