Force

Force is a push or pull applied to an object that can set it into motion, bring it to a stop, change its direction, or alter its shape. Every physical action from opening a door to holding the entire Earth together relies on force.

Effects of force on objects

• It makes a resting object start moving, such as kicking a stationary football.
• It causes an object to travel faster and farther when a person applies even more force.
• It stops motion or redirects a moving body, as seen when players pass a ball across the field.
• It can alter the shape of an object or destroy it, like when stomping a ball with excessive force causes it to burst.

Force in daily activities

Everyday actions depend entirely on the push or pull exerted on things. Pulling a small box requires force, and pulling a bigger box requires even more force to move along. Common tasks such as taking off a pen cap, opening a door at home, punching, running, walking, and hitting a cricket ball hard with a bat all happen because force is applied. An applied force can act in any direction, and the object moves according to the way that force is directed.

Measuring force

Scientists measure physical properties using standard units, such as meters for length and kilograms for mass. Force is measured in a unit called the Newton, which is its official SI unit. This standard measurement allows people to describe and compare amounts of force accurately.

How thrust propels objects

When a force acts straight, meaning perpendicular to a surface, an opposite force is created. This opposing force is called thrust. A rocket provides a clear example of thrust in action, as it shoots upward at great speed in the direction opposite to the fire coming out of its base. Without thrust, this kind of upward motion would not be possible.