Question Video: Comparing Tools for Measuring Related Quantities | Nagwa Question Video: Comparing Tools for Measuring Related Quantities | Nagwa

# Question Video: Comparing Tools for Measuring Related Quantities Physics • First Year of Secondary School

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Complete the sentence by filling in the blanks: A beam balance, a spring balance, and a digital scale are types of measurement tools. A beam balance and digital scale are typically used to measure ＿ and a spring balance is typically used to measure ＿.

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### Video Transcript

Complete the sentence by filling in the blanks. A beam balance, a spring balance, and a digital scale are types of measurement tools. A beam balance and digital scale are typically used to measure blank and a spring balance is typically used to measure blank. Is it (A) weight, mass or (B) mass, weight.

To begin, let’s recall the difference between weight and mass as well as what these measurement tools are and how they’re used.

Remember that the weight of an object depends on its mass and the gravitational force acting on it. Because of this, an object weighs less on the Moon than it does on Earth, for example, because on the surface of the Moon, the object experiences a weaker gravitational force than here on Earth. But the mass of an object tells how much matter is in it. And so an object’s mass is the same no matter where it’s measured.

Thankfully, converting between mass and weight is simple. And actually, tools used for measuring mass really measure weight but can be calibrated so that they give the mass of objects.

Now let’s take a look at the three measurement tools we’re considering in the question.

A beam balance functions by taking an object with a known mass and comparing it to an object that we want to measure the mass of. Beam balances are typically calibrated to read mass measurements.

Digital scales are also usually calibrated to read mass measurements. To do this, the digital scale first measures an object’s weight and then calculates the mass from that. And the final mass reading can be displayed in units of kilograms or grams, for instance.

We’ve seen that both the beam balance and digital scale are typically used to measure mass. So let’s go ahead and fill in this first blank with the word mass.

Thus, we can infer that the spring balance is normally used to measure weight, and this is correct. When using a spring balance, we hang an object on a spring. And the force of gravity pulls the object downward, causing the spring to extend or stretch out. We can tell the weight of the object by seeing how much it extends the spring. So let’s fill in this second blank with the word weight. This corresponds to answer option (B).

Completing the sentence, we have that a beam balance, a spring balance, and a digital scale are types of measurement tools. A beam balance and digital scale are typically used to measure mass and a spring balance is typically used to measure weight.

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