Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 247 · 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.⚙️ Which simple machine is a wheelchair ramp? (a) wedge (b) wheel and axle (c) lever (d) inclined plane
2. 2.💪 In which unit do we measure force? (a) litre (L) (b) newton (N) (c) second (s) (d) metre (m)
3. 3.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a bottle opener (c) a seesaw (d) a playground slide
4. 4.🔍 Which is the odd one out? (a) a playground slide (b) a claw hammer on a nail (c) a road up a hill (d) a truck loading ramp
5. 5.⚖️ A lever bar balances. The load is 480 N at 40 cm from the fulcrum. The effort is 240 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
6. 6.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a flat ramp (c) a smaller rod (axle) (d) a sharp wedge
7. 7.💪 Which force is at work: lifting a school bag? (a) gravity (b) magnetic force (c) muscular force (d) friction
8. 8.🏋️ A 14 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
9. 9.⚖️ A lever bar balances. The load is ? N at 40 cm from the fulcrum. The effort is 120 N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
10. 10.🏋️ A smooth ramp is 3 m long and rises 1 m. What effort pushes a 900 N box up it, in newtons? (ideal ramp, no friction)
11. 11.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a tyre with deep treads (c) sand on a slippery path (d) a wet tiled floor
12. 12.💪 A cart is pulled to the right with 20 N and to the left with 10 N. Which way does the net force act? (a) to the right (b) no net force (c) to the left
13. 13.⚖️ Which class of lever is your forearm? (a) class 2 (b) class 3 (c) class 1
14. 14.True or false: a wheel on ball bearings gives less friction. (a) True (b) False
15. 15.🪝 A bucket weighing 450 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
16. 16.🏋️ Can a simple machine reduce the work done? (a) yes, always (b) no, work stays the same (c) yes, by half (d) only on Mondays
17. 17.🏋️ Pushing a crate 10 m took 1000 J of work. What force was used, in newtons?
18. 18.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
19. 19.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) a box pushed on carpet
20. 20.⚖️ A seesaw balances. Asha (? N) sits 4 m from the pivot on one side; Meena (800 N) sits 2 m from the pivot on the other side. What is the missing weight in newtons?
21. 21.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
22. 22.Which of these is caused by magnetic force? (a) rubbing hands warms them (b) a magnet picks up pins (c) brakes stop a bicycle (d) shoes grip the floor
23. 23.⚙️ Which simple machine is a chisel? (a) lever (b) pulley (c) screw (d) wedge
24. 24.💪 A cart is pulled to the right with 100 N and to the left with 100 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
25. 25.⚖️ Which class of lever is a pair of pliers? (a) class 1 (b) class 2 (c) class 3
26. 26.True or false: a wheelchair ramp is a lever. (a) False (b) True
27. 27.🏋️ A machine lifts a load of 1000 N when you push with 200 N. What is its mechanical advantage (MA)?
28. 28.🏋️ A machine lifts a load of 360 N when you push with 60 N. What is its mechanical advantage (MA)?
29. 29.True or false: a rough doormat gives less friction. (a) False (b) True
30. 30.⚖️ A seesaw balances. Arjun (? N) sits 2 m from the pivot on one side; Zoya (400 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
31. 31.💪 A box weighs 10 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
32. 32.True or false: a movable pulley stays in one place. (a) False (b) True
33. 33.⚖️ Along a straight bar, measured from the left end, the effort is at 20 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
34. 34.Which of these is a lever? (a) a chisel (b) a door stopper (c) a flagpole rope wheel (d) a claw hammer on a nail
35. 35.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 0 cm and the load at 20 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
36. 36.💪 Two children push a box to the right, one with 15 N and the other with 40 N. What is the net (total) force on the box, in newtons?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 7 N, ice 4 N, a wooden plank 5 N, a carpet 6 N. How many newtons more were needed on sandpaper than on ice?
38. 38.True or false: a movable pulley only changes direction. (a) True (b) False
39. 39.⚖️ In a class 2 lever, what is in the middle? (a) the fulcrum (b) the effort (c) the axle (d) the load
40. 40.⚖️ A lever bar balances. The load is 560 N at ? cm from the fulcrum. The effort is 280 N at 80 cm from the fulcrum on the other side. What is the missing distance in centimetres?

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