What is Force? | Contact Force and Non-Contact Force | Science Lesson

Force is introduced as a push or pull, with its unit being the Newton, named after Sir Isaac Newton. The video illustrates that force can make an object move, change its direction, speed it up, stop it, and even change its shape.

Contact force requires objects to physically touch for the force to be exerted. Examples provided include opening a door, kicking a ball, dribbling a tennis ball, and pressing a button.

Non-contact force acts without direct physical contact between objects. This category includes magnetic force, electrostatic force, and gravitational force.

Magnetic force is described as the push or pull from a magnet, which can attract magnetic objects. A compass is mentioned as an application of magnetic force for finding directions.

Electrostatic force is the force between charged particles, with examples given such as lightning and hair standing on end.

Gravitational force is defined as the force that attracts objects towards the Earth's center. Examples illustrating gravity include the moon orbiting the Earth, planets orbiting the sun, water falling from mountains, snow falling, and leaves falling from trees.