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Motion, Forces, and Energy: Physical Quantities and Measurement Techniques

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Questions and Answers

Explain the difference between a scalar quantity and a vector quantity.

Scalar quantity has magnitude only, whereas vector quantity has magnitude and direction.

How can you determine the average value for a short interval of time?

By measuring multiples, including the period of oscillation of a pendulum.

Describe how to measure a variety of time intervals.

Time intervals can be measured using clocks and digital timers.

What quantities are considered scalars?

Distance, speed, time, mass, energy, and temperature. Signup and view all the answers

Can you determine the resultant of two vectors at right angles? If so, what are these vectors limited to?

Yes, the resultant of vectors at right angles can be determined. These vectors are limited to forces or velocities only. Signup and view all the answers

Define speed and provide the equation to calculate speed.

Speed is defined as distance travelled per unit time. The equation to calculate speed is v = s/t. Signup and view all the answers

What is the equation to calculate average speed?

The equation to calculate average speed is average speed = total distance travelled / total time taken. Signup and view all the answers

How can you determine when an object is accelerating from a distance-time graph?

You can determine when an object is accelerating if the distance-time graph is curved (not a straight line). Signup and view all the answers

Define acceleration and provide the equation to calculate acceleration.

Acceleration is defined as change in velocity per unit time. The equation to calculate acceleration is a = ∆v/∆t. Signup and view all the answers

What is density and provide the equation to calculate density?

Density is defined as mass per unit volume. The equation to calculate density is ρ = m/V. Signup and view all the answers

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