Applied Force

Definition

An applied force is a force that is exerted on an object by a person or another object. This type of force is typically the initial force that causes motion, change in velocity, or deformation in the object. Understanding applied forces is essential when analyzing systems because they are often the starting point for examining how various forces interact and affect the overall behavior of the system.

5 Must Know Facts For Your Next Test

1. Applied forces can be contact forces, where an object must be in physical contact with another, or action-at-a-distance forces, such as gravitational forces.
2. The direction of the applied force significantly affects how an object will move; even a small change in direction can lead to different outcomes.
3. An applied force can cause static friction to be overcome, allowing an object at rest to start moving.
4. When multiple applied forces act on an object, they can combine to create a net force that influences the object's motion.
5. In free body diagrams, applied forces are typically represented with arrows pointing in the direction of the force, indicating both magnitude and direction.

Review Questions

• How does an applied force interact with other forces acting on an object, and what effect does this have on its motion?
  • An applied force interacts with other forces, such as friction and normal force, to determine the net force acting on an object. For instance, if an applied force is greater than the opposing frictional force, the object will accelerate in the direction of the applied force. Conversely, if the frictional force is greater than or equal to the applied force, the object may remain at rest. Understanding these interactions is crucial for predicting motion and behavior in various mechanical systems.
• Discuss how applied forces are represented in free body diagrams and their importance in understanding mechanical systems.
  • In free body diagrams, applied forces are depicted as arrows that indicate both magnitude and direction. These diagrams simplify complex situations by isolating an object and showing all external forces acting on it. By analyzing these diagrams, one can easily visualize how different forces interact and contribute to the net force on the object. This representation is essential for solving problems related to motion and equilibrium in mechanical systems.
• Evaluate the significance of applied forces in real-world applications, considering their role in engineering design and safety.
  • Applied forces play a crucial role in engineering design and safety because they are fundamental to how structures and machines operate under various conditions. Engineers must account for applied forces when designing buildings, bridges, and vehicles to ensure they can withstand expected loads without failure. Understanding these forces allows for safer designs that minimize risks associated with dynamic loads or unexpected stresses. Moreover, applying principles related to applied forces helps engineers develop effective safety measures, ensuring both functionality and stability in their creations.

Related terms

Net Force: The total force acting on an object after all individual forces have been combined, determining the object's acceleration.

Frictional Force: The force that opposes the motion of an object when it comes into contact with another surface, acting parallel to the surfaces in contact.

Normal Force: The support force exerted by a surface perpendicular to an object resting on it, counteracting the weight of the object.