Density and pressure

Worksheet: Density and pressure

Name:Class:

Answer the questions.

1. Which formula gives density?
   a) force ÷ areab) mass × volumec) mass ÷ volumed) volume ÷ mass
2. A block has a mass of 200 g and a volume of 50 cm³. What is its density?
   a) 0.25 g/cm³b) 10 g/cm³c) 150 g/cm³d) 4 g/cm³
3. A metal has mass 90 g and volume 30 cm³. What is its density in g/cm³?
4. Two objects with the same volume but different masses have different densities.
   a) Trueb) False
5. An object floats in water when its density is...
   a) exactly double water'sb) less than water's densityc) more than water's densityd) the same as its mass
6. Water has a density of 1 g/cm³. Which material would sink in it?
   a) Cork, 0.24 g/cm³b) Ice, 0.92 g/cm³c) Iron, 7.9 g/cm³d) Oil, 0.9 g/cm³
7. A huge steel ship can float because its overall density is less than water's.
   a) Trueb) False
8. Which formula gives pressure?
   a) area ÷ forceb) force × areac) force ÷ aread) mass ÷ volume
9. A force of 100 N acts on an area of 4 m². What is the pressure in N/m²?
10. Why does a sharp knife cut better than a blunt one?
    a) It has a larger contact areab) It has a larger massc) Smaller area gives less pressured) Smaller area gives more pressure
11. Why do snowshoes stop you sinking into deep snow?
    a) They concentrate force on a small areab) They increase the force downwardc) They make you lighterd) They spread your weight over a larger area
12. As a diver goes deeper in the sea, the water pressure on them...
    a) decreasesb) drops to zeroc) increasesd) stays the same
13. At the same depth, water pressure acts only downwards, not sideways.
    a) Trueb) False
14. Why are dam walls built thicker at the bottom?
    a) Water is lighter at the bottomb) Water pressure is greatest at the bottomc) Water pressure is greatest at the topd) Water pressure is the same everywhere
15. What causes air pressure?
    a) Air particles colliding with surfacesb) Air particles moving away from surfacesc) Air particles sticking to surfacesd) Wind blowing only in storms
16. How does air pressure change as you climb a high mountain?