1.3 & 1.4 Physical Quantities and Units

Question 1

1.3.2 What is the distinction between precision and accuracy?

Answer 1

Precision refers to the ability to take multiple readings with an instrument that are close to each other, whereas accuracy is the closeness of those measurements to the true value.

Question 2

1.4.1 What is the difference between scalar and vector quantities?

Answer 2

A vector quantity is a physical quantity with both magnitude and direction, whereas a scalar quantity only has magnitude.

Question 3

1.4.1 Are the following Scalar or vector?
1. Time
2. Acceleration
3. Distance
4. Velocity
5. Momentum
6. Kinetic energy

Answer 3

1. S
2. V
3. S
4. V
5. V
6. V