Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 144 · 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.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a wooden plank 4 N, a carpet 7 N. How many newtons more were needed on a carpet than on ice?
2. 2.Which of these is caused by friction? (a) a thrown ball comes down (b) rubbing hands warms them (c) squeezing a lemon (d) rain falls to the ground
3. 3.Which of these is an inclined plane? (a) a knife edge (b) a door stopper (c) a road up a hill (d) a jar lid
4. 4.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
5. 5.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
6. 6.True or false: a movable pulley rises with the load. (a) True (b) False
7. 7.True or false: a fixed pulley hangs on the rope loop. (a) True (b) False
8. 8.🏋️ Work is done when a force moves something … (a) without moving it (b) only upwards (c) through a distance (d) very slowly
9. 9.True or false: a grippy rubber sole gives more friction. (a) False (b) True
10. 10.⚖️ Along a straight bar, measured from the left end, the effort is at 10 cm, the fulcrum at 50 cm and the load at 90 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
11. 11.⚖️ A seesaw balances. Asha (140 N) sits 1 m from the pivot on one side; Zoya (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
12. 12.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to go slower (d) to look nice
13. 13.⚖️ A seesaw balances. Zoya (600 N) sits 1 m from the pivot on one side; Arjun (150 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
14. 14.Which of these is a pulley? (a) a well winch handle (b) a flagpole rope wheel (c) a nut and bolt (d) a claw hammer on a nail
15. 15.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
16. 16.Which of these is caused by magnetic force? (a) a fridge magnet sticks (b) lifting a school bag (c) a rolling ball slows (d) pedalling a cycle
17. 17.⚖️ What is the pivot point of a lever called? (a) the load (b) the fulcrum (c) the axle (d) the effort
18. 18.⚙️ Which simple machine is a well-bucket rope wheel? (a) lever (b) pulley (c) wheel and axle (d) screw
19. 19.🪝 A load of 1200 N hangs from a pulley system in which 4 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
20. 20.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 10 cm and the load at 40 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
21. 21.🪝 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
22. 22.🛞 Which surface gives the MOST friction to a sliding block? (a) sandpaper (b) polished marble (c) ice (d) glass
23. 23.⚖️ To lift a heavy rock with a crowbar more easily, push … (a) near the fulcrum (b) on the fulcrum (c) far from the fulcrum (d) on the rock
24. 24.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 10 N, a glass sheet 1 N, a wooden plank 3 N, a carpet 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
25. 25.🔍 Which is the odd one out? (a) oil on a squeaky hinge (b) a box pushed on carpet (c) a grippy rubber sole (d) chalk on a gym bar
26. 26.🪝 A bucket weighing 210 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
27. 27.🏋️ A force of 470 N pushes a cart 3 m along the floor. How much work is done, in joules?
28. 28.⚖️ A lever bar balances. The load is 30 N at 10 cm from the fulcrum. The effort is 10 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
29. 29.🏋️ A machine lifts a load of 600 N when you push with 120 N. What is its mechanical advantage (MA)?
30. 30.True or false: chalk on a gym bar gives less friction. (a) True (b) False
31. 31.💪 Which force is at work: a river flows downhill? (a) magnetic force (b) friction (c) muscular force (d) gravity
32. 32.⚖️ A seesaw balances. Asha (? N) sits 1 m from the pivot on one side; Kabir (100 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
33. 33.⚖️ Along a straight bar, measured from the left end, the effort is at 40 cm, the fulcrum at 80 cm and the load at 30 cm. Which class of lever is it? (a) class 2 (b) class 3 (c) class 1
34. 34.🏋️ Pushing a crate 7 m took 1680 J of work. What force was used, in newtons?
35. 35.🏋️ A force of 300 N pushes a cart 2 m along the floor. How much work is done, in joules?
36. 36.🏋️ A machine lifts a load of 1200 N when you push with 200 N. What is its mechanical advantage (MA)?
37. 37.Which of these is a lever? (a) a well-bucket rope wheel (b) a wood screw (c) a seesaw (d) a round doorknob
38. 38.🏋️ A force of 70 N pushes a cart 3 m along the floor. How much work is done, in joules?
39. 39.🛞 Is friction helpful or a problem here: dragging a heavy box? (a) helpful (b) a problem
40. 40.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 10 cm and the load at 70 cm. Which class of lever is it? (a) class 3 (b) class 2 (c) class 1

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