Introduction to Forces and Categories of Forces

The video introduces the concept of forces, defining them as interactions that cause a push or pull on objects. It categorizes forces into contact and non-contact types, explaining each with examples. Contact forces include friction, tension, air resistance, and normal force, while non-contact forces cover gravity, magnetic, and electrostatic forces. The video also provides examples to illustrate these concepts and discusses the units of force, emphasizing that force is a vector quantity with both magnitude and direction.

What is a force defined as in the context of physics?

• A measure of mass

• A push or pull due to interaction

• A form of acceleration

• A type of energy

Which of the following is a contact force?

• Friction

• Gravitational force

• Magnetic force

• Electrostatic force

Which force acts on a skydiver in freefall?

• Tension

• Weight

• Normal contact force

• Air resistance

What type of force is experienced when two magnets repel each other?

• Contact force

• Tension

• Non-contact force

• Friction

In the example of a ball being dropped, what force acts upwards when it hits the ground?

• Electrostatic force

• Normal contact force

• Magnetic force

• Weight

What is the unit of force in the International System of Units?

• Joule

• Pascal

• Watt

• Newton

When two people push a box in opposite directions, what must be considered to determine the net force?

• Only the magnitude of the forces

• Only the direction of the forces

• Both magnitude and direction of the forces

• The speed of the box