Question 1
A system has a pressure of 5 N/m^2
If a force of 2000 N is applied, what is the area that the force is applied to?
ANSWER: Simple text answer
Answer: 400 m^2
Workings:
\dfrac{2000 \space N}{5 \space Nm^{-2}} = 400 m^2
Marks = 2
Question 2
The force applied to a 0.4 m by 0.8 m break pad produces a pressure of 500 N/m^2.
Calculate the force applied to the break pad.
ANSWER: Simple text answer
Answer: 160 N
Workings:
Area = 0.4 \times 0.8 = 0.32 m^2
500 \times 0.32 = 160 N
Marks = 2
Question 3
An object exerts a force of 10 kN on an area of 2 cm^2.
What is the pressure the object exerts on the surface?
Give the units of pressure.
ANSWER: Simple text answer
Answer: 5000 Ncm^{-2}
Workings:
\dfrac{10000}{2} = 5000 Ncm^{-2}
Marks = 1
Question 4
Our atmosphere exerts a pressure of 101 N/m^2.
Calculate the force on one square centimetre caused by the atmosphere.
Give your answer in Newtons to 3 significant figures.
ANSWER: Simple text answer
Answer: 0.0101 Ncm^{-2}
Workings:
101 Nm^{-2} = 0.0101 Ncm^{-2}
Marks = 1
Question 5
A crate in a Wearhouse exerts a 10,000 N force on the floor.
Calculate the pressure on the warehouse floor caused by the crate.
Give your answer in Newtons to 3 significant figures.
ANSWER: Simple text answer
Answer:
Workings:
Area = 0.5 \times 3 = 1.5 m^2
\dfrac{10000}{1.5} = 6670 Nm^{-2}
Marks = 2
Question 6
A needle requires a force of 0.5 Newtons to puncture the skin.
The tip of the needle has an area of 0.0000001 m^2
Calculate the pressure needed to puncture the skin?
ANSWER: Simple text answer
Answer: 5 \times 10^6 Nm^{-2}
Workings:
\dfrac{0.5}{0.0000001} = 5 \times 10^6 Nm^{-2}
Marks = 2
Question 7
A coin is dropped off of a building landing on its side.
It hits with a pressure of 400N/m^2
It hits with a force of 0.1 N
Calculate the area of the coin?
ANSWER: Simple text answer
Answer: 2.5 \times 10^{-4} m^2
Workings:
\dfrac{0.1}{400} = 2.5 \times 10^{-4} m^2
Marks = 2
Question 8
A cylinder sands on the circular end.
The cylinder exerts a force of 2 N onto the floor.
The cylinder has a radius of 0.5 m
Calculate the pressure the cylinder exerts on the floor.
Give your answer to 3 significant figures.
ANSWER: Simple text answer
Answer: 2.55 Nm^{-2}
Workings:
Area = \pi \times 0.5^2 = 0.25 \pi m^2
\dfrac{2}{0.25\pi} = 2.55 Nm^{-2}
Marks = 2