The Power of Non-Contact Forces in Our World

The video tutorial explains non-contact forces, which act between objects not in direct contact. It covers magnetic, gravitational, and electrostatic forces. Magnetic force is demonstrated with a magnet and iron nail, gravitational force with falling objects, and electrostatic force with a plastic scale and paper pieces. The video also discusses how magnets attract and repel each other based on their poles.

What is a non-contact force?

• A force that only acts on liquids.

• A force that acts at a distance without direct contact.

• A force that only acts on gases.

• A force that requires physical contact between objects.

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

• Frictional force

• Tension force

• Magnetic force

• Normal force

What causes an apple to fall from a tree?

• Electrostatic force

• Frictional force

• Gravitational force

• Magnetic force

Gravitational force depends on which factor?

• The color of the object

• The distance between the object and the Earth

• The shape of the object

• The temperature of the object

What happens when a plastic scale is rubbed against dry hair?

• It becomes magnetic

• It produces an electrostatic charge

• It changes color

• It becomes heavier

What is the result of bringing a charged scale near small paper pieces?

• The paper pieces are repelled

• The paper pieces are attracted

• The paper pieces change color

• The paper pieces become heavier

What are the two poles of a magnet called?

• Top and Bottom

• North and South

• Positive and Negative

• East and West

What happens when the South Pole of one magnet is brought close to the North Pole of another magnet?

• They become neutral

• They lose their magnetism

• They attract each other

• They repel each other

What occurs when the North Poles of two magnets are brought close together?

• They attract each other

• They repel each other

• They become neutral

• They lose their magnetism

Which materials can a magnet attract?

• Glass and rubber

• Iron, cobalt, and nickel

• Plastic and wood

• Paper and cloth