Which statement is true about a triple beam balance and spring scale?
1. A triple beam balance is used to measure the mass of an object, and a spring scale is used to measure the weight of an object.
2. It helps microorganisms grow.
3. Beakers have liquid volume (mL) markings on the side of them; test tubes are unmarked.
4. They can contain mercury that is very harmful to humans.
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To identify the true statement about a triple beam balance and spring scale, we need to understand the characteristics and uses of each apparatus.
1. Triple Beam Balance:
A triple beam balance is a type of mechanical balance used for measuring the mass of objects. Its main features include:
- Beams: The balance consists of three beams that contain riders. Each beam has a different set of calibrated masses (rider weights) mounted on the sliding weights.
- Pan: The object being weighed is placed on the pan, which is located at the top of the balance.
- Reading: The balance is balanced by moving the riders along the beams until the pointer is perfectly aligned with the zero mark. The sum of the masses indicated by each beam provides the total mass of the object.
2. Spring Scale:
A spring scale, also known as a force meter or spring balance, is an instrument used to measure the force applied to an object. Its key features are:
- Spring: The force applied to the spring causes it to stretch or compress. The amount of deformation is directly proportional to the force applied.
- Pointer or Scale: The spring scale is equipped with a pointer or scale that displays the force value based on the stretching or compression of the spring.
Now, let's evaluate the provided statement:
"Both a triple beam balance and a spring scale measure mass."
The statement is not entirely accurate. While both tools are used to measure objects, they are employed for different purposes:
- Triple Beam Balance: It measures the mass of an object. The balance compares the gravitational force on an object to a set of calibrated masses, ultimately determining its mass accurately.
- Spring Scale: It measures the force applied to an object. Instead of measuring mass directly, it quantifies the force or weight acting on an object by using the deformation of a spring.
Therefore, the correct statement would be:
"A triple beam balance measures the mass of an object, while a spring scale measures the force applied to an object."