Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 867 · 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.🏋️ Pushing a crate 7 m took 3360 J of work. What force was used, in newtons?
2. 2.⚖️ A lever bar balances. The load is 720 N at 10 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?
3. 3.🏋️ A force of 90 N did 540 J of work. How many metres did the object move?
4. 4.🪝 A bucket weighing 40 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
5. 5.🪝 A bucket weighing 100 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
6. 6.🪝 A well winch has a handle (wheel) of radius 24 cm turning an axle of radius 3 cm. What is its mechanical advantage (MA)?
7. 7.🪝 A wheel and axle is a big wheel fixed to … (a) a loose rope (b) a flat ramp (c) a sharp wedge (d) a smaller rod (axle)
8. 8.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
9. 9.🏋️ A force of 340 N did 1700 J of work. How many metres did the object move?
10. 10.⚙️ Which simple machine is a knife edge? (a) wheel and axle (b) screw (c) wedge (d) lever
11. 11.🏋️ A force of 470 N pushes a cart 1 m along the floor. How much work is done, in joules?
12. 12.Which of these is a wedge? (a) a flagpole rope wheel (b) a bottle cap (c) a well-bucket rope wheel (d) a door stopper
13. 13.🏋️ A smooth ramp is 2 m long and rises 1 m. What effort pushes a 2000 N box up it, in newtons? (ideal ramp, no friction)
14. 14.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
15. 15.Which of these is a lever? (a) a jar lid (b) a door stopper (c) a bottle opener (d) a flagpole rope wheel
16. 16.True or false: a pair of scissors is a class 3 lever (effort in the middle). (a) False (b) True
17. 17.⚖️ A lever bar balances. The load is 150 N at 50 cm from the fulcrum. The effort is ? N at 30 cm from the fulcrum on the other side. What is the missing force in newtons?
18. 18.⚖️ Which class of lever is a seesaw? (a) class 3 (b) class 2 (c) class 1
19. 19.💪 A box weighs 330 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
20. 20.💪 A cart is pulled to the right with 35 N and to the left with 20 N. Which way does the net force act? (a) no net force (b) to the right (c) to the left
21. 21.True or false: plucking a mango is a push. (a) True (b) False
22. 22.⚖️ Going along a lever from one end to the other, the order is: effort, fulcrum, load. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
23. 23.🔍 Which is the odd one out? (a) a grippy rubber sole (b) oil on a squeaky hinge (c) a wet tiled floor (d) skating on ice
24. 24.⚖️ A lever bar balances. The load is 60 N at 30 cm from the fulcrum. The effort is ? N at 60 cm from the fulcrum on the other side. What is the missing force in newtons?
25. 25.Which of these is caused by magnetic force? (a) a thrown ball comes down (b) pedalling a cycle (c) shoes grip the floor (d) a fridge magnet sticks
26. 26.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 60 N at 40 cm from the fulcrum on the other side. What is the missing force in newtons?
27. 27.🪝 A well winch has a handle (wheel) of radius 4 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
28. 28.⚖️ In a class 3 lever, what is in the middle? (a) the load (b) the fulcrum (c) the pulley (d) the effort
29. 29.🏋️ A 6 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
30. 30.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the direction of pull (c) the size of the load (d) gravity
31. 31.True or false: closing a drawer is a push. (a) True (b) False
32. 32.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
33. 33.⚙️ How many simple machines are there in the usual list? (a) 3 (b) 12 (c) 10 (d) 6
34. 34.🛞 More or less friction: a wheel on ball bearings? (a) less friction (b) more friction
35. 35.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
36. 36.⚖️ A seesaw balances. Kabir (120 N) sits 4 m from the pivot on one side; Zoya (480 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
37. 37.True or false: opening a drawer is a push. (a) False (b) True
38. 38.🏋️ A machine lifts a load of 160 N when you push with 80 N. What is its mechanical advantage (MA)?
39. 39.True or false: a pair of tweezers is a class 2 lever (load in the middle). (a) True (b) False
40. 40.🏋️ A machine lifts a load of 330 N when you push with 110 N. What is its mechanical advantage (MA)?

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