Physical Quantities

Question 1

How to measure the thickness of paper?
(no micrometer)

Answer 1

1. Measure the length of 100 sheets using micrometer.
2. Dividde answer/reading by 100 to obtain the average thickness of one sheet of paper.
3. Take the readings perpendicular to avoid parrellex error.

Question 2

How to measure the thickness of paper?
(with micrometer)

Answer 2

1. Check zero micrometer.
2. Place 5 sheets between arms of micrometer.
3. Close micrometer.
4. Take reading from horizontal and vertical scale.
5. Divide answer/reading by 5 to obtain average thickness.

Question 3

How to measure the circumference of a cylinder?

Answer 3

1. Obtain a string.
2. Rotate string around cylinder.
3. Measure length of string.

Question 4

How to measure the volume of an irregular object?

Answer 4

1. Pour water into measuring cylinder (V1).
2. Submerge/immerse rock in measuring cylinder.
3. Take new reading (V2).
   Volume of rock = V2 - V1

Question 5

Define density.

Answer 5

It is the mass per unit volume.

Question 6

How to meaure the volume of a floating irregular object?

Answer 6

1. Pour water into measuring cylinder (V1).
2. Submerge/immerse rock in measuring cylinder.
3. Tie rock to a sinking metal so it can sink.
4. Take new reading (V2).
   Volume of rock = V2 - V1

Question 7

How to measure the time of one swing in a pendulum?

Answer 7

1. Check zero stopwatch.
2. Start stopwatch.
3. Let pendulum oscillate 50 times.
4. Record time.
5. Divide time by 50 to get average time of one swing.
6. Repeat and take average.

Question 7

How to measure the time of one swing in a pendulum?

Answer 7

1. Check zero stopwatch.
2. Start stopwatch.
3. Let pendulum oscillate 50 times.
4. Record time.
5. Divide time by 50 to get average time of one swing.
6. Repeat and take average.