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

Summary

This video defines force as a push or pull, explains its unit (Newton), and demonstrates its various effects like causing movement, changing direction, speeding up or stopping objects, and altering their shape. It then categorizes force into contact and non-contact forces, providing examples for each type, including magnetic, electrostatic, and gravitational forces.

Highlights

Defining Force and its Effects00:00:00

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 Force00:01:08

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 Force00:01:47

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

Magnetic Force00:02:06

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 Force00:02:30

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

Gravitational Force00:02:54

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.