Exploring Tension and Normal Forces

The video tutorial explores two fundamental forces: tension and normal forces. Tension force is described as the stretching of molecular bonds in a rope when a mass is hanging, balancing the weight force. The normal force is introduced as a surface force that acts perpendicular to an object on a flat surface, balancing the gravitational pull. The video explains that on a horizontal surface, the normal force equals the weight force, while this changes on angled surfaces.

What happens to molecular bonds in a rope under tension?

• They remain unchanged

• They stretch

• They break

• They compress

At what level do molecular bonds stretch under tension?

• Gravitational level

• Quantum level

• Microscopic level

• Macroscopic level

What is the tension force?

• A force that acts perpendicular to a surface

• A force that occurs when an object is pulled

• A force that pushes objects together

• A force that acts parallel to a surface

In the context of a hanging mass, what does the weight force equal?

• Mass times the tension force

• Mass divided by the acceleration due to gravity

• Mass times the acceleration due to gravity

• Mass divided by the tension force

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

In the special case of a non-moving hanging mass, what is the relationship between the tension force and the weight force?

• Tension force is greater than the weight force

• Tension force is less than the weight force

• Tension force equals the weight force

• Tension force is unrelated to the weight force

What is the normal force?

• A force that acts perpendicular to a surface

• A force that acts parallel to a surface

• A force that acts in the direction of motion

• A force that acts at an angle to a surface

Why is the normal force called 'normal'?

• Because it acts parallel to the surface

• Because it is a weak force

• Because it acts at a right angle to the surface

• Because it is a common force

What does the normal force equal for an object on a horizontal surface?

• The tension force

• The friction force

• The weight force

• The applied force

What happens to the normal force on an angled surface?

• It equals the weight force

• It acts parallel to the surface

• It becomes zero

• It does not equal the weight force

Tags

NGSS.HS-PS2-1

What does 'perpendicular' mean in the context of normal force?

• At an angle of 180 degrees

• At an angle of 0 degrees

• At an angle of 45 degrees

• At an angle of 90 degrees