Normal Force Physics Problems With Tension, Inclined Planes & Free Body Diagrams

TL;DR

The normal force is the perpendicular force exerted by a surface on an object, equal to the weight of the object, but it can be increased or decreased by applying additional forces.

Transcript

in this video we're going to focus on calculating the normal force of an object so let's say if you have a horizontal surface and there's a box on a surface now let's say it's a five kilogram box what is the normal force that is acting on the box if you have a flat object on a surface the normal force is simply the weight of the object let's calcul... Read More

Key Insights

• 🏋️ The normal force is the force exerted by a surface on an object in contact with it and is equal to the weight of the object.
• 🏋️ Applying a downward force on an object increases the normal force, while lifting the object with a rope decreases the normal force.
• 🌆 The normal force can be calculated by setting up equations using the sum of forces in the y direction and taking into account additional forces.
• 🏋️ If the tension force in a rope exceeds the weight of the object, the normal force becomes negative, indicating the object is lifted off the surface.

Questions & Answers

Q: How is the normal force related to the weight of an object?

The normal force is equal to the weight of the object when it is resting on a horizontal surface and there are no additional forces acting on it.

Q: How can the normal force be increased?

The normal force can be increased by applying a downward force on the object, effectively increasing the weight that the surface needs to support.

Q: How can the normal force be decreased?

The normal force can be decreased by lifting the object with a rope, allowing the surface to support less of the object's weight.

Q: What happens if the tension force in a rope exceeds the weight of the object?

If the tension force in a rope exceeds the weight of the object, the normal force becomes negative, indicating that the object is no longer in contact with the surface.

Summary & Key Takeaways

• The normal force is the force exerted by a surface on an object in contact with it and is equal to the weight of the object.

• The normal force can be increased by applying a downward force on the object, and decreased by lifting the object with a rope.

• To calculate the normal force, set up an equation using the sum of forces in the y direction, taking into account any additional forces applied.