Lesson 1.

Question 1

How do you measure distance and time in a laboratory?

Answer 1

In a science lesson you usually use a ruler to measure distance, and a stop clock or stopwatch to measure time.

Question 2

What can you use ultrasound for?

Answer 2

You can also use ultrasound (high-frequency sound waves) to measure distance. The device measures the time taken for a pulse to travel there and back. It uses this value, and the speed of the pulse, to work out the distance.

Question 3

What can you use light gates for?

Answer 3

You can measure very short periods of time using light gates, as a timer starts and stops when an object interrupts a light beam.

Question 4

Define “non-uniform.”

Answer 4

Changes throughout the process.

Question 5

Define “uniform.”

Answer 5

Stays the same throughout the process.

Question 6

TRUE OR FALSE:
In uniform motion speed changes.

Answer 6

FALSE:
In uniform motion speed does not change.

Question 7

What is the formula for average speed (m/s)?

Answer 7

average speed (m/s) ->
Total distance (m) / total time (s)

Question 8

What are the Sl units of distance and time?

Answer 8

Metres and seconds.

Question 9

How do you convert miles to metres?

Answer 9

Multiply by 1609.

Question 10

How do you convert hours to seconds?

Answer 10

Multiply by 3600.

Question 11

In graphs, what are uncertainties represented by?

Answer 11

“Error bars.”