Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 805 · 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.True or false: a door stopper is a wedge. (a) False (b) True
2. 2.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
3. 3.⚖️ A lever bar balances. The load is ? N at 20 cm from the fulcrum. The effort is 20 N at 20 cm from the fulcrum on the other side. What is the missing force in newtons?
4. 4.⚖️ On a seesaw, a heavier child should sit … (a) anywhere (b) closer to the pivot (c) on the pivot (d) farther from the pivot
5. 5.🪝 A pulley system lifts a 160 N load with an effort of 80 N. What is its mechanical advantage (MA)?
6. 6.Which of these is caused by magnetic force? (a) rubbing hands warms them (b) a thrown ball comes down (c) rain falls to the ground (d) a magnet picks up pins
7. 7.🔍 Which is the odd one out? (a) sand on a slippery path (b) a rough doormat (c) oil on a squeaky hinge (d) chalk on a gym bar
8. 8.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a fixed pulley (b) a movable pulley
9. 9.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
10. 10.⚙️ A screw is really … (a) a bent lever (b) a ramp wrapped round (c) a kind of wheel (d) a tiny pulley
11. 11.True or false: a fixed pulley is on a flagpole top. (a) True (b) False
12. 12.💪 In a tug of war, one team pulls right with 95 N and the other pulls left with 35 N. What is the size of the net force, in newtons?
13. 13.True or false: oil on a squeaky hinge gives less friction. (a) True (b) False
14. 14.True or false: a movable pulley is on a flagpole top. (a) True (b) False
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 7 N, sandpaper 8 N, ice 2 N. Which surface gave the least friction? (a) sandpaper (b) a glass sheet (c) ice (d) a carpet
16. 16.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 9 N, ice 4 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
17. 17.⚖️ In a class 3 lever, what is in the middle? (a) the effort (b) the pulley (c) the load (d) the fulcrum
18. 18.True or false: chalk on a gym bar gives more friction. (a) True (b) False
19. 19.⚖️ Turning effect = force × … (a) colour of bar (b) time taken (c) mass of fulcrum (d) distance from fulcrum
20. 20.🪝 A bucket weighing 120 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
21. 21.💪 Is hitting a cricket ball a push or a pull? (a) a push (b) a pull
22. 22.🏋️ A force of 270 N pushes a cart 9 m along the floor. How much work is done, in joules?
23. 23.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a flat ramp (c) a smaller rod (axle) (d) a loose rope
24. 24.💪 Which force pulls everything towards the Earth? (a) wind (b) gravity (c) magnetism (d) friction
25. 25.Which of these is caused by magnetic force? (a) shoes grip the floor (b) a fridge magnet sticks (c) squeezing a lemon (d) brakes stop a bicycle
26. 26.⚖️ A lever bar balances. The load is 630 N at ? cm from the fulcrum. The effort is 140 N at 90 cm from the fulcrum on the other side. What is the missing distance in centimetres?
27. 27.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 600 N box up it, in newtons? (ideal ramp, no friction)
28. 28.True or false: pulling a cart is a pull. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) a bottle opener (b) a claw hammer on a nail (c) a nutcracker (d) a nut and bolt
30. 30.⚖️ A lever balances when … (a) turning effects match (b) the fulcrum moves (c) the bar is short (d) both weights are equal
31. 31.⚖️ 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
32. 32.⚖️ A seesaw balances. Ravi (? N) sits 1 m from the pivot on one side; Asha (120 N) sits 3 m from the pivot on the other side. What is the missing weight in newtons?
33. 33.🔍 Which is the odd one out? (a) an axe blade (b) a knife edge (c) a door stopper (d) a water tap handle
34. 34.True or false: sand on a slippery path gives less friction. (a) True (b) False
35. 35.⚖️ Which class of lever is a broom when sweeping? (a) class 2 (b) class 1 (c) class 3
36. 36.⚙️ How many simple machines are there in the usual list? (a) 6 (b) 12 (c) 3 (d) 10
37. 37.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
38. 38.⚖️ A seesaw balances. Meena (? N) sits 2 m from the pivot on one side; Arjun (300 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
39. 39.🪝 What does a single fixed pulley change? (a) the colour of rope (b) the direction of pull (c) gravity (d) the size of the load
40. 40.🪝 A bucket weighing 420 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)

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