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Which of the following is NOT a force acting on an object in a free-body diagram?
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6. Intro to Forces (Dynamics)
Types Of Forces & Free Body Diagrams
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In the context of types of forces and free-body diagrams, which of the following is a good example of a contact force?
A
The normal force exerted by a table on a book resting on it
B
The gravitational force exerted by Earth on a falling ball
C
The magnetic force between two bar magnets held apart without touching
D
The electric force between two charged spheres separated by a distance
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Understand the difference between contact forces and non-contact forces. Contact forces require physical touching between objects, while non-contact forces act over a distance without direct contact.
Identify the forces listed in the problem: normal force, gravitational force, magnetic force, and electric force.
Recall that the normal force is the force exerted by a surface to support the weight of an object resting on it, and it acts through direct physical contact.
Recognize that gravitational, magnetic, and electric forces act over a distance and do not require the objects to be touching, so they are examples of non-contact forces.
Conclude that the normal force exerted by a table on a book resting on it is a good example of a contact force because it involves direct physical interaction between the book and the table.
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