Pressure is calculated as force ÷ area and its unit is the pascal, so this Year 8 sheet opens with the pressure relation and its unit. A moment is force × perpendicular distance, and the key records reducing pressure and a clockwise moment.
Key Takeaways
Pressure = force ÷ area (Q1).
The unit of pressure is the pascal (Q2).
Q3 records force × perpendicular distance as the moment.
Section A: Multiple Choice Questions (1 Mark Each)
Choose the correct option for each question.
1.Pressure is calculated using...
(a) pressure = force × area(b) pressure = force ÷ area(c) pressure = area ÷ force(d) pressure = force + area
2.The unit of pressure is the...
(a) newton(b) joule(c) pascal(d) watt
3.The moment of a force is calculated using...
(a) force × perpendicular distance(b) force ÷ distance(c) distance ÷ force(d) mass × distance
4.Wearing snowshoes spreads your weight over a large area to...
(a) increase the pressure(b) reduce the pressure(c) increase friction(d) reduce friction
5.For a see-saw to balance, the total anticlockwise moment must equal the total...
(a) clockwise moment(b) force(c) pressure(d) area
6.If the force is kept the same and the area is increased, the pressure...
(a) increases(b) decreases(c) stays the same(d) doubles
Section B: Short Answer Type Questions (2 Marks Each)
Show all steps clearly.
7.State the formula for pressure and give its unit.
8.Explain why a sharp knife cuts better than a blunt knife.
9.State the formula for the moment of a force.
10.What is the unit of a moment of a force?
11.State the Principle of Moments.
12.Explain why tractors have very wide tyres.
13.In the moment formula, what is meant by the perpendicular distance?
14.Two people of equal weight sit on opposite sides of a balanced see-saw. What must be true about their distances from the pivot?
Section C: Numericals & Word Problems (3 Marks Each)
Apply the concepts to solve the problems. Show all working.
15.A force of 100 N acts on an area of 2 m². Use pressure = force ÷ area to calculate the pressure in pascals.
16.A box has a weight of 200 N and rests on a base with an area of 0.5 m². Use pressure = weight ÷ area to calculate the pressure it exerts.
17.A person exerts a pressure of 2000 Pa over a contact area of 0.05 m². Use force = pressure × area to calculate the force in newtons.
18.A force of 30 N acts at a perpendicular distance of 2 m from a pivot. Use moment = force × distance to calculate the moment in Nm.
19.A child of weight 40 N sits 3 m from the pivot of a see-saw. A second child of weight 60 N sits on the other side. For balance, the 40 N moment must equal the 60 N moment. Calculate the distance of the 60 N child from the pivot.
20.A force of 5 N produces a moment of 20 Nm about a pivot. Use distance = moment ÷ force to calculate the perpendicular distance in metres.
Answer Key
1. b) pressure = force ÷ area
2. c) pascal
3. a) force × perpendicular distance
4. b) reduce the pressure
5. a) clockwise moment
6. b) decreases
7. Refer to solution guide.
8. Refer to solution guide.
9. Refer to solution guide.
10. Refer to solution guide.
11. Refer to solution guide.
12. Refer to solution guide.
13. Refer to solution guide.
14. Refer to solution guide.
15. Refer to solution guide.
16. Refer to solution guide.
17. Refer to solution guide.
18. Refer to solution guide.
19. Refer to solution guide.
20. Refer to solution guide.
End of Worksheet
People Also Ask
How is pressure calculated?
Force ÷ area, option (b) in this worksheet (Q1).
What is the unit of pressure?
The pascal, option (c) in this worksheet (Q2).
What is the moment of a force?
Force × perpendicular distance, option (a) in this worksheet (Q3).
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