Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 227 · 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.⚖️ A lever bar balances. The load is 160 N at 40 cm from the fulcrum. The effort is ? N at 80 cm from the fulcrum on the other side. What is the missing force in newtons?
2. 2.⚖️ A seesaw balances. Meena (? N) sits 1 m from the pivot on one side; Zoya (100 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
3. 3.True or false: a fixed pulley needs effort = load. (a) False (b) True
4. 4.⚖️ Turning effect = force × … (a) time taken (b) colour of bar (c) distance from fulcrum (d) mass of fulcrum
5. 5.Which of these is an inclined plane? (a) a road up a hill (b) a round doorknob (c) a nutcracker (d) a wood screw
6. 6.🔍 Which is the odd one out? (a) an axe blade (b) a knife edge (c) a window blind cord (d) a door stopper
7. 7.🔍 Which is the odd one out? (a) a claw hammer on a nail (b) a nutcracker (c) a truck loading ramp (d) a seesaw
8. 8.💪 A box weighs 230 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
9. 9.⚖️ A seesaw balances. Meena (? N) sits 3 m from the pivot on one side; Ravi (480 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
10. 10.🔍 Which is the odd one out? (a) a playground slide (b) a truck loading ramp (c) a road up a hill (d) a flagpole rope wheel
11. 11.⚖️ A seesaw balances. Zoya (110 N) sits 3 m from the pivot on one side; Asha (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
12. 12.🛞 More or less friction: a tyre with deep treads? (a) less friction (b) more friction
13. 13.Which of these is an inclined plane? (a) a crowbar (b) a wheelchair ramp (c) a door stopper (d) a bottle cap
14. 14.🏋️ A 12 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
15. 15.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) on the pivot (c) closer to the pivot (d) farther from the pivot
16. 16.Which of these is caused by muscular force? (a) rain falls to the ground (b) a rolling ball slows (c) lifting a school bag (d) a thrown ball comes down
17. 17.True or false: pulling a cart is a push. (a) True (b) False
18. 18.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 10 (c) 12 (d) 6
19. 19.🛞 How can we reduce friction in a machine? (a) add sand (b) oil the moving parts (c) make parts rough (d) press parts harder
20. 20.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
21. 21.Which of these is a wedge? (a) a nutcracker (b) a truck loading ramp (c) a crane hook block (d) a door stopper
22. 22.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
23. 23.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 1400 N box up it, in newtons? (ideal ramp, no friction)
24. 24.Which of these is caused by magnetic force? (a) a rolling ball slows (b) a thrown ball comes down (c) squeezing a lemon (d) a fridge magnet sticks
25. 25.💪 Which force is at work: a rolling ball slows? (a) gravity (b) friction (c) muscular force (d) magnetic force
26. 26.🏋️ A force of 120 N pushes a cart 2 m along the floor. How much work is done, in joules?
27. 27.💪 Is pushing a trolley a push or a pull? (a) a pull (b) a push
28. 28.🪝 A well winch has a handle (wheel) of radius 32 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
29. 29.🏋️ Pushing a crate 7 m took 2170 J of work. What force was used, in newtons?
30. 30.🏋️ An 11 kg box is lifted straight up by 4 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
31. 31.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
32. 32.🛞 Rubbing your hands fast makes them … (a) magnetic (b) warm (c) wet (d) cold
33. 33.⚖️ Which class of lever is a pair of tweezers? (a) class 1 (b) class 3 (c) class 2
34. 34.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 4 cm. What is its mechanical advantage (MA)?
35. 35.💪 In a tug of war, one team pulls left with 90 N and the other pulls right with 85 N. What is the size of the net force, in newtons?
36. 36.True or false: a fixed pulley stays in one place. (a) True (b) False
37. 37.🏋️ Work is done when a force moves something … (a) without moving it (b) very slowly (c) through a distance (d) only upwards
38. 38.⚙️ Most simple machines make work easier by letting us … (a) stop all friction (b) switch off gravity (c) use a smaller force (d) make new energy
39. 39.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
40. 40.🏋️ A machine lifts a load of 160 N when you push with 80 N. What is its mechanical advantage (MA)?

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