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The force constant, commonly known as the Spring Constant, is the parameter that determines the stiffness of a spring.
- It is based on Newton's Third Law of Motion, which states that "for every action, there is an equal and opposite reaction."
- Hooke's law, which states that "the restoring force of the spring is directly proportional to the small displacement," defines the relationship between this restoring force and displacement.
- The constant proportionality is referred to as the Spring Constant. N/m (Newton per meter) is the SI unit for the spring constant.
- Helical springs are often referred to as coil springs.
- It is a mechanical spring made of a wire turned into a coil that resembles a screw thread. Helical Springs can push, pull, and carry weights.
- Torsion or twisted helical springs are commonly employed in hinges and engine starters.
Ques. What is meant by elasticity?
Ans. When the forces producing the deformation are eliminated, the capacity of a distorted material body to return to its original shape and size is referred to as elasticity. This ability causes a body to act (or respond) elastically.
Ques. Define the yield point.
Ans. The yield point on a stress-strain curve denotes the end of elastic behavior and the start of plastic behavior. A material will bend elastically below the yield point and return to its original shape when the applied force is removed.
Ques. What is meant by elastic limit?
Ans. The elastic limit is the applied force value at which the material (body) does not return to its original form when the applied force is reduced.
Ques. What is a deforming force?
Ans. When applied, a deforming force causes a change in the structure of an item. The quality that causes the shape and size of the body to change over time is termed a deforming force.
Ques. What is a rigid body?
Ans. A rigid body, also known as a rigid object, is a solid entity with zero or little deformation. The distance between any two points on a rigid body remains constant throughout time, independent of the external forces or moments acting on it.
Ques. Define stress.
Ans. Stress is a term used in physics to describe the forces involved in deformation. Tensile tension may cause elongation in an object that is being pushed apart, such as a stretched elastic band.
Ques. Give the unit of stress.
Ans. The unit of stress is Newton per meter squared (N m-2) or Pascal (Pa).
Ques. Why do you remove kinks before starting the experiment?
Ans. If kinks are not removed before starting the experiment, kinks opened by the load will show more extension.
Ques. What is the formula for stress?
Ans. The formula of stress is given by
Stress = Restoring force (F)/Area (A)
Ques. What is a perfectly plastic body?
Ans. A perfectly plastic body is a material that, even when the deforming forces are removed, never returns to its initial size or shape. Example: Wax and putty.
Ques. What is meant by compressive stress?
Ans. Compressive stress is the force responsible for material deformation such that the volume of the material decreases. The stress that a substance undergoes causes it to shrink in volume. High compressive stress causes material failure due to tension.
Ques. What is meant by tensile stress?
Ans. Tensile stress is defined as the ratio of a stretching force exerted on a material to its cross-sectional area. The force per unit area is what causes an object to be tense.
Ques. What are a few examples of perfectly plastic bodies?
Ans. Putty, wax, paraffin, and others are examples of perfectly plastic bodies.
Ques. Is quartz elastic or not?
Ans. Yes, quartz is highly elastic in nature.
Ques. What is brittle material?
Ans. Brittle materials have minimal deformation, a low resistance to impact and vibration, a high compressive strength, and a low tensile strength. The majority of inorganic non-metallic materials are brittle.
Ques. What is ductile material?
Ans. A ductile material is a material with the physical feature of being able to be drawn or stretched very thinly in the direction it is pushed without breaking.
Ques. What is Hooke’s Law?
Ans. Hooke's law, often known as the law of elasticity, was established in 1660 by the English physicist Robert Hooke and states that the displacement or size of a deformed item is directly proportional to the deforming force or load.
Ques. What are a few examples of ductile materials?
Ans. A few examples of ductile materials are Iron, silver, copper, aluminum, gold, etc.
Ques. What is the difference between pressure and stress?
Ans. The amount of force exerted per unit area is referred to as pressure. Stress, on the other hand, is the restoring force exerted per unit area.
Ques. What are a few examples of brittle materials?
Ans. A few examples of brittle materials are glass, cast iron, ceramic, graphite, etc.
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