Density and pressure
No description yet. This curated deck is ready for daily study.
Card preview (12)
Define density. 1 mark
Density is the Mass per unit Volume.
What is the formula for density? 1 mark
Denity = Mass ÷ Volume
What is density measured in? 2 marks
Either g/cm³ or kg/m³
Liquid water has a density of 1.0g/cm³, while ice has a density of 0.92g/cm³. Calculate the volume occupied by 250g of: i) liquid water ii) ice 6 marks
i) Volume = Mass ÷ Density Volume = 250 ÷ 1 Volume = 250cm³ ii) V = M ÷ D V = 250 ÷ 0.92 V = 271.74cm³
Define pressure. 1 mark
Pressure is the Force per unit Area.
What is the formula for pressure? 1 mark
Pressure = Force ÷ Area
What is pressure measured in? 2 marks
Either N/m² or N/cm²
What is an alternative for N/m²? 1 mark
1N/m² = 1 Pa (pascal)
Find the pressure when the force applied is 200N and the surface area is 23cm². 3 marks
p = F ÷ A p = 200 ÷ 23 p = 8.70N/cm²
Calculate the area if an object creates a pressure of 25 Pa when acting from the force of 300N. 3 marks
A = F ÷ p A = 3000 ÷ 25 A = 120m²
Pressure acts at an angle of ……….°? 1 mark
90°
The smaller the area the 1)………. the pressure. The larger the area the 2)………. the pressure. 2 marks
• Higher • Smaller