Questions and Answers
What is the study that connects force and motion called?
Dynamics
What type of force acts perpendicular to the contact surface and prevents objects from passing through each other?
Normal force
What is the force called that propels a flying machine in the direction of motion?
Thrust
What type of force resists the relative motion of solid surfaces, fluid layers, and material elements?
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What is the type of force experienced by charged objects without physical contact called?
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What is a normal force?
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What type of force produces motion in a rocket?
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When is a friction force created?
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Describe a tension force.
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When is tension considered an elastic force?
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Study Notes
Dynamics
- Dynamics is the study of the connection between force and motion.
Force
- Force is a vector quantity that can change or tend to change the state of a body.
- Force can start or stop motion, speed up or slow down, and change the direction of motion.
Types of Forces
- Forces are broadly classified as contact and non-contact forces.
Contact Forces
- Contact forces occur when two objects are in physical contact.
- Examples of contact forces include:
- Normal Force: a force perpendicular to the contact surface that keeps objects from passing through each other.
- Thrust: a force that propels a flying machine in the direction of motion.
- Friction: a force that resists the relative motion of solid surfaces, fluid layers, and material elements in contact and sliding against each other.
- Tension: a force exerted by an object when it's being pulled or stretched, and occurs when two or more objects are in contact through a string, rope, cable, or spring.
Non-Contact Forces
- Non-contact forces occur when objects are not in physical contact.
- Examples of non-contact forces include magnetic forces, which can act over a distance without physical contact.
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