WorksheetsWeyPhys KS3 Pressure
Total questions: 16
Worksheet time: 8mins
Pressure = Force/ (a)
What are the units of pressure?
N m2
N / m
N m
N / m2
What unit for pressure is equal to 1N/m2
Gauss
Hertz
Tesla
Pascal
A Force of 200N acts on an area of 50cm2. What pressure does this cause?
4 N/cm2
1000 N/cm2
150 N/cm2
250 N/cm2
A force of 15,000 N acts on an area of 0.2m2. What pressure does this cause?
750 Pa
7,500 Pa
75,000 Pa
750,000 Pa
A car which weighs 20,000 N presses equally down on 4 tyres, each with a contact acre of 0.02 m2. What is the pressure in each tyres?
1,000,000 Pa
400 Pa
250,000 Pa
100,000 Pa
Why is the pressure at the bottom of a column of liquid higher than at the top?
The water at the bottom is much denser than at the top.
The air pressure is lower at the bottom.
Because of the weight of all the liquid above it
Because some water evaporates from the top surface
Which of these tubes has the greatest pressure at the bottom?
D because the shape narrows lower down
The pressure is equal at the bottom in all of them.
C as it contains the greatest volume and weight
A and C as the tubes only push sideways not upwards.
What causes pressure in gases?
Collisions between the gas molecules and each other and the container walls.
Electrostatic repulsion between the gas molecules.
Chemical reactions between gas molecules releasing thermal energy.
Gravitational attraction due to the Earth's mass
Why does water boil at 71° C at the top of Mount Everest?
Because there is a much lower air-pressure there.
Because water molecules escape from the liquid surface more easily there.
The air pushes with less force on the water's surface.
All 3 of these reasons.
The atmosphere pushes down with a pressure of about 100,000 Pa. How much force presses in on your body, which has a surface area of about 1.7m2 ?
170,000 N
17,000 N
1,700 N
58,823 N
What causes an upthrust force?
Water reacting against gravity
Electrostatic attraction between water molecules
The pressure at the bottom of an immersed object is higher than at the top
The object causes a sideways pressure force on the surrounding water.
If an object sinks...
...the upthrust is equal to the object's weight.
... the upthrust is greater than the object's weight.
... the object's weight is greater than the upthrust.
There is zero resultant force acting on the object
For an iceberg, or any floating object, what is true
The iceberg's weight is equal to the weight of the water it has displaced.
The iceberg's weight is greater than the weight of the water it has displaced.
The resultant force on the iceberg is not zero and it acts upwards.
The iceberg is denser than the surrounding sea water.
Why do people float higher in the water in the Dead Sea?
The water is warm so rises, causing an upwards current.
The water has a lower density than other sea water so it rises upwards, pushing against your body.
The Dead Sea water has a higher density and causes a greater upthrust force for the same amount of submerged volume
The Dead Sea is lower than sea level and gravity is much weaker there.
Which statement explains what happens to air pressure in a bottle if the bottle is heated ?
The air molecules travel faster on average, increasing the pressure.
The air molecules collide with the container walls more frequently, increasing the pressure.
The air molecules collide with the container walls with more force, increasing the pressure.
All of these answers.
