What is a spring balance Class 8?
Spring balance is a device used to measure the weight of small bodies. As the weigths are hung to the spring it stretches the the pointer indicates the weight hung or the force applied on the spring. The working principle of spring balance is Hook’s law.
What is least count of spring balance?
Therefore, the minimum value it can measure is one hundred grams, which can be measured as follows: Measurement = 1 kg Total Number of divisions = 10 Least count= (1/10) = 0.1kg (or 100g) Hence 100g is the least count of this instrument.
What is spring balance in friction?
Spring balance is used for measuring : (1) The force acting on an object (2) The force of friction (3) Magnitude of the pressure (4) Relative motion between the object. Answer: Spring balance is used to determine the force acting on the object (weight). Spring balance works on the principle of Hooke’s law.
Can we use spring balance to measure friction?
Answer. we can use a spring balance to determine the force of friction. the reading on the scale when the object was about to move would be static friction, while the reading when the object is moving would be the dynamic friction.
How do you make a spring balance model?
A spring balance is a weighing equipment used to measure the weight of different objects. It comprises of a spring fixed at one end with a hook to attach an object at the other end. In this TACtivity, we use a cardboard, a graduated scale and a spring to create a spring balance.
What is inside a spring balance?
A spring scale or spring balance or newton meter is a type of mechanical force gauge or weighing scale. It consists of a spring fixed at one end with a hook to attach an object at the other. Therefore, the scale markings on the spring balance are equally spaced. A spring scale cannot measure mass, only weight.
What are the characteristics of sensitive balance?
A balance is said to be sensitive when it can register small differences in weight. The balance beam is most sensitive when its center of gravity lies slightly below its rotation axis.
How do you balance a pan at home?
Steps
- Use a hole punch to make holes in 2 small paper cups. Punch 2 holes in each cup.
- Cut 2 pieces of twine that are each around 1 foot (0.30 m) long. Any kind of twine will work, but a thick, strong twine will make the balance scale more durable.
- Tie the ends of the twine through the holes in the cups.
What is the most sensitive balance?
The world’s most sensitive scales can now detect a cluster of xenon atoms a billion, trillion times lighter than a gram. A zeptogram (10-21)g) is roughly the mass of a single protein molecule and its detection has set a new record.
What is the accuracy of a balance?
For example, a customer may choose a balance with 0.1 mg readability (4 decimal places). The accuracy of the balance relates to the measurement uncertainty of each reading, i.e., the ± tolerance in the result. A fast, stable weighing result is not necessarily an indication of accuracy.
Which measuring tool is the most sensitive?
graphene nanomechanical bolometer
What is sensitivity of a balance?
A balance is said to be sensitive when it can register small differences in weight. The balance beam is most sensitive when its center of gravity lies slightly below its rotation axis. Sensitivity of a balance is one of the most important specifications. …
What is weight sensitivity?
A sensitivity weight is selected to calibrate the balance over the range to be used in the measurement procedure. Minimizing the difference in mass values between X and S is critical when choosing an appropriate sensitivity weight.
What is D and E in weighing balance?
The value “d” is the smallest division shown on the scale display. The value “e” is the verification scale division. It represents the stated accuracy of a scale when the scale display has extra units added in order to expand the resolution.
What is the weight limit of a Class A Balance?
Class A prescription balance this balance, the pharmacist should not weigh less than 120 milligrams of material (i.e., a 5% error in a weighing of 120 milligrams = 6 milligrams). Most commercially available Class A balances have a maximum capacity of 120 grams.
What type of balance is required in every pharmacy?
The Class A Prescription Balance is the balance most commonly used by pharmacists; in fact, all pharmacies are required by law to have one in the prescription deparhnent. It is a 2 par torcion balance which r€quircs th€ use of extemal weights for measurements exceedilg 1 g.
What is a Class 3 balance?
The Class III Prescription Balance is a 2 pan torsion type balance which utilizes both internal and external weights. The Class III Balance has a sensitivity requirement of 6 mg, meaning that as much as 6 mg could be added to or removed from the pan before the balance marker will move 1 division.
What is D in balance?
“d” for digit; digitus – lat. for finger (counting and calculating with the fingers is therefore a digital process) If you have a readability interval of d=0.0001g, it means that the smallest step you can read on it is 0.0001g (or 0.1mg) and increasing or decreasing the weight applied will change.
What is the resolution of a balance?
Resolution (sometimes called readability or division) is the number of divisions into which the total capacity is broken down for the purpose of displaying the weight value. This is normally expressed in grams. Thus a balance may be described as 1kg (capacity) x 0.1g (resolution).