Understanding Forces

The video tutorial introduces the concept of force, defined as a push or pull, with its unit being the newton, named after Sir Isaac Newton. It explains the effects of force, such as moving objects, changing their direction, speed, stopping them, or altering their shape. Force is classified into contact and non-contact types. Contact forces require physical touch, like opening a door or kicking a ball, while non-contact forces, such as magnetic, electrostatic, and gravitational forces, act without direct contact. Examples include magnets attracting objects, lightning, and gravity causing objects to fall.

What is the unit of force?

• Joule

• Watt

• Newton

• Pascal

Who is the unit of force named after?

• Galileo Galilei

• Nikola Tesla

• Isaac Newton

• Albert Einstein

Which of the following is NOT an effect of force?

• Changing the shape of an object

• Making an object move

• Stopping a moving object

• Changing the color of an object

What can a force do to a moving object?

• All of the above

• Stop it

• Make it speed up

• Change its direction

How are forces classified?

• Internal and external

• Positive and negative

• Static and dynamic

• Contact and non-contact

Which of the following is an example of a contact force?

• Kicking a ball

• Electrostatic force

• Gravitational force

• Magnetic force

Which action is NOT an example of a contact force?

• Dribbling a tennis ball

• Pressing a button

• Opening a door

• Lightning

What type of force is magnetic force?

• Frictional force

• Tension force

• Non-contact force

• Contact force

What causes hair to stand up due to electrostatic force?

• Gravitational pull

• Wind

• Magnetic attraction

• Charged particles

Why do leaves fall from a tree?

• Wind

• Gravity

• Magnetic force

• Electrostatic force