Physics Chapter Basics of Measurements

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Questions and Answers

What is the unit of force in terms of fundamental units (kg, m, s)?

kg⋅m/s²

Explain how the unit of work is derived from the units of force and distance.

Work is defined as force multiplied by distance. The unit of force is kg⋅m/s², and the unit of distance is m. Therefore, the unit of work is kg⋅m/s² × m, which simplifies to kg⋅m²/s².

What is the relationship between the units of velocity and acceleration?

Acceleration is the rate of change of velocity. Therefore, the unit of acceleration is the unit of velocity divided by time. Since the unit of velocity is m/s and the unit of time is s, the unit of acceleration becomes m/s².

How can the unit of density be expressed using exponents?

<p>The unit of density is kg/m³, which can also be expressed as kg⋅m⁻³.</p>

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Write the unit of acceleration in terms of meters and seconds, using scientific notation?

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Flashcards

What is area?

Area is the amount of space a two-dimensional surface occupies. It's calculated by multiplying length and breadth.

What is volume?

Volume measures the amount of space a three-dimensional object takes up. It's calculated by multiplying length, breadth, and height.

What is density?

Density is the measure of how much mass is contained in a given volume. It's calculated by dividing mass by volume.

How do you calculate Velocity?

Velocity is the rate of change of displacement over time. It's calculated by dividing displacement by time.

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How do you calculate Acceleration?

Acceleration is the rate of change of velocity over time. It's calculated by dividing the change in velocity by the time it takes.

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Study Notes

Area

Area equals length multiplied by breadth
Unit: m² (meters squared)

Volume

Volume equals length multiplied by breadth multiplied by height
Unit: m³ (cubic meters)

Density

Density equals mass divided by volume
Unit: kg/m³ (kilograms per cubic meter) or kgm⁻³ (kilograms per cubic meter)

Velocity

Velocity equals displacement divided by time
Unit: m/s (meters per second) or ms⁻¹ (meters per second)

Acceleration

Acceleration equals change in velocity divided by time
Unit: m/s² (meters per second squared) or ms⁻² (meters per second squared)

Force

Force equals mass multiplied by acceleration
Unit: kgm/s² (kilograms multiplied by meters per second squared) or kgms⁻² (kilograms multiplied by meters per second squared)

Work

Work equals force multiplied by distance
Unit: kgm²/s² (kilograms multiplied by meters squared per second squared) or kgms⁻² * m (kilograms multiplied by meters squared per second squared multiplied by meters) This value is often written as kgm²/s² or kgm²s⁻²