Physics Topic 1 Let's get started Flashcards
Give three safety rules and explain why they are important.
Examples: 1. DO NOT go into the laboratory without permission. - The lab can be a dangerous place and students need to be supervised when in the lab. 2. NEVER run or rush about the laboratory. You should not leave your seat without the permission of your teacher. - Rushing about could lead to an accident such as tripping and knocking over an experiment. 3. Leave floors and bench tops clear. Put bags and cases under the benches. - Bags should be put under benches and floors clear so that no one trips over anything. Work benches should be clear to allow for practical equipment to be set up safely.
What is volume?
Volume is the space occupied by an object
What is the symbol for volume?
V
What are the units of volume?
mm3 (millimetres cubed), cm3, m3, l (litre), ml (millilitre)
Volume =
Volume = Length x Breadth x Height
What are the units of length, breadth and height?
mm, cm, m
When would you use (i) cm3 and (ii) ml to measure volume?
(i) volume of a box or liquid (ii) volume of a liquid only
V =
l x b x h (all lower case)
A box measures 3cm by 2cm by 5cm what is its volume?
You must show your working out to get full marks: V = l x b x h = 3 x 2 x 5 = 30 cm3
A box measures 4m by 200cm by 3m what is its volume?
You must show your working out to get full marks:
All units need to be the same i.e. 200cm = 2m
V = l x b x h
= 4 x 2 x 3
= 24 m3
or
V = l x b x h
= 400 x 200 x 300
= 24000000 cm3
To read volumes of liquids ACCURATELY, it is essential to read the volume with the eye in line with….
….the top of the water level at the bottom of the MENISCUS.
Label the meniscus.
Meniscus
How would you measure the volume of an irregular object?
Half fill a measuring cyclinder and record the volume.
Attach a sting to the object and lower it into the water.
(The object must be completely covered by water, if not start again with more water)
Note the new volume.
Take the intial volume from the final volume, this is the volume of your object.
What is mass?
Mass is the measure of the amount of metter (or stuff) in an object.
What is the symbol of mass?
m (must be lowercase)
What are the following temperature?
Remember units!
8 cm3
27 cm3
6 cm3
53 cm3
Where are the following temperatures on the blank thermometer?
(i) 36 oC, (ii) 75 oC, (iii) 49 oC, (iv) 73 oC
Careful with your scale.
John and Mary wanted to find out how quickly the water in their electric kettle cooled down after the kettle had been switched off. They put some water in the kettle and boiled it. They agreed they should measure the temperature every five minutes. This is what they wrote down:
Start 95, 72, 64, 50, 40, 33, 27, 23, 20, 20 finish
This is not a very good way of writing down the results. Record the results in a suitable format.
Draw a graph for the data.
What are the variables and what is the relationship between them?
Graph
Variables are ‘temperature T / oC’ and ‘time t / min’.
As the time increases the temperature decreases.
Put the following information about height and mass into a suitable table:
Susan 142 cm 35 kg
Lee 144 cm 42 kg
Clark 146 cm 31 kg
Veena 148 cm 43 kg
Robert 149 cm 34 kg
Sharon 151 cm 38 kg
What are the variables shown in the table? Is there a relationship between the variables, explain your answer?
Variable: Height & Mass
No relationship as when the height is increased the mass does not follow a trend.
What variable are shown by the containers in the diagram?
Describe the trend in containers B, C & D.
Describe a trend for containers A & E.
Height and width of the container.
With B, C & D as the height increases the width increases.
With A & E as the height increases the width decreases.
What are the following hazard symbols?
flammable
harmful/irritant
toxic
corrosive
