Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 143 · 40 questions

Engineer's tip (Find the topic, use the idea): Find the topic: force, friction, machine, lever class, balance, pulley or work. Use that lesson’s rule — what is in the middle, load × distance = effort × distance, effort = load ÷ ropes, work = force × distance. Write the calculation before you answer.

1. 1.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 110 cm and the load at 70 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
2. 2.🏋️ A force of 490 N pushes a cart 3 m along the floor. How much work is done, in joules?
3. 3.🪝 A well winch has a handle (wheel) of radius 16 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
4. 4.💪 Two children push a box to the right, one with 70 N and the other with 55 N. What is the net (total) force on the box, in newtons?
5. 5.🏋️ Pushing a crate 10 m took 3500 J of work. What force was used, in newtons?
6. 6.⚖️ A lever bar balances. The load is 450 N at 10 cm from the fulcrum. The effort is ? N at 90 cm from the fulcrum on the other side. What is the missing force in newtons?
7. 7.⚖️ A lever bar balances. The load is 450 N at 40 cm from the fulcrum. The effort is 200 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
8. 8.⚙️ Which simple machine is a road up a hill? (a) pulley (b) wheel and axle (c) inclined plane (d) lever
9. 9.⚖️ Which class of lever is a fishing rod? (a) class 3 (b) class 2 (c) class 1
10. 10.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
11. 11.💪 Is opening a drawer a push or a pull? (a) a pull (b) a push
12. 12.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 160 N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
13. 13.🔍 Which is the odd one out? (a) a bottle cap (b) a nut and bolt (c) a claw hammer on a nail (d) a wood screw
14. 14.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
15. 15.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
16. 16.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 140 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
17. 17.⚖️ A lever balances when … (a) the fulcrum moves (b) both weights are equal (c) the bar is short (d) turning effects match
18. 18.💪 In a tug of war, one team pulls right with 20 N and the other pulls left with 10 N. What is the size of the net force, in newtons?
19. 19.⚖️ A seesaw balances. Ravi (100 N) sits ? m from the pivot on one side; Meena (400 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
20. 20.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) far from the fulcrum (b) near the fulcrum (c) on the fulcrum (d) on the rock
21. 21.True or false: a truck loading ramp is an inclined plane. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) a tyre with deep treads (b) a smooth steel slide (c) oil on a squeaky hinge (d) a wheel on ball bearings
23. 23.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 3 (c) 10 (d) 12
24. 24.💪 Is pulling up your socks a push or a pull? (a) a push (b) a pull
25. 25.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the pulley (c) the effort (d) the load
26. 26.🏋️ Pushing a crate 3 m took 450 J of work. What force was used, in newtons?
27. 27.⚙️ A screw is really … (a) a kind of wheel (b) a bent lever (c) a ramp wrapped round (d) a tiny pulley
28. 28.💪 A force is a … (a) kind of colour (b) unit of time (c) push or a pull (d) type of sound
29. 29.True or false: a broom when sweeping is a class 1 lever (fulcrum in the middle). (a) False (b) True
30. 30.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 2700 N box up it, in newtons? (ideal ramp, no friction)
31. 31.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
32. 32.🪝 A winch has a wheel of radius 8 cm and an axle of radius 2 cm. What effort on the wheel lifts a 280 N bucket on the axle, in newtons? (ideal)
33. 33.🪝 A well winch has a handle (wheel) of radius 15 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
34. 34.True or false: pressing a doorbell is a push. (a) False (b) True
35. 35.Which of these is a wedge? (a) a bottle opener (b) a nutcracker (c) an axe blade (d) a claw hammer on a nail
36. 36.💪 In a tug of war, one team pulls left with 90 N and the other pulls right with 20 N. What is the size of the net force, in newtons?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, sandpaper 12 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
39. 39.💪 A box weighs 490 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
40. 40.⚖️ Which class of lever is a broom when sweeping? (a) class 2 (b) class 1 (c) class 3

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