Normal Force
The normal force is the force exerted by a surface to support the weight of an object resting on it. It acts perpendicular to the surface and prevents the object from falling through the surface.
Understanding the Normal Force
When an object is placed on a surface, the force of gravity pulls it downward. The surface exerts an equal and opposite force, perpendicular to the surface, to support the weight of the object. This is known as the normal force.
Calculating the Normal Force
The magnitude of the normal force can be calculated using the formula:
FN = m * g
Where FN is the normal force, m is the mass of the object, and g is the acceleration due to gravity (approximately 9.81 m/s2 on the surface of the Earth).
Key Points to Remember
- The normal force is always perpendicular to the surface.
- It is a contact force that acts to support the weight of an object.
- The normal force can vary based on the angle of the surface and other forces acting on the object.
Study Tips
To better understand the normal force, consider the following tips:
- Practice solving problems involving the normal force using the formula FN = m * g.
- Visualize scenarios where the normal force changes, such as on an inclined plane or in an elevator.
- Understand the relationship between the normal force and other forces acting on an object, such as friction or applied forces.
◂Science Worksheets and Study Guides Seventh Grade. Elements and the periodic table
Study Guide
Elements and the periodic table 
Activity Lesson
Elements & the Periodic Table Worksheet/Answer key
Elements and the periodic table Worksheet/Answer key
Elements and the periodic table Worksheet/Answer key
Elements and the periodic table Worksheet/Answer key
Elements and the periodic table Vocabulary/Answer key
Elements and the periodic table Vocabulary/Answer key
Elements and the periodic table
Activity LessonWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyVocabulary/Answer keyVocabulary/Answer keyThe resources above cover the following skills:
Chemistry: Students will use scientific skills and processes to explain the composition, structure, and interactions of matter in order to support the predictability of structure and energy transformations.
Structure of Matter: Cite evidence to support the fact that all matter is made up of atoms, which are far too small to see directly through a microscope.
Recognize and describe that the atoms of each element are alike but different from atoms of other elements.
Recognize and describe that different arrangements of atoms into groups compose all substances.
Provide examples to illustrate that elements are substances that do not breakdown into smaller parts during normal investigations involving heating, exposure to electric current or reactions with acids.
Cite evidence to explain that all living and non-living things can be broken down to a set of known elements.