Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 643 · 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 seesaw balances. Asha (? N) sits 3 m from the pivot on one side; Arjun (450 N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
2. 2.Which of these is a wedge? (a) a steering wheel (b) a door stopper (c) a bottle cap (d) a jar lid
3. 3.⚖️ 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
4. 4.🏋️ Pushing a crate 7 m took 2380 J of work. What force was used, in newtons?
5. 5.🪝 A winch has a wheel of radius 16 cm and an axle of radius 4 cm. What effort on the wheel lifts a 480 N bucket on the axle, in newtons? (ideal)
6. 6.True or false: a rough doormat gives more friction. (a) False (b) True
7. 7.⚙️ Which simple machine is a window blind cord? (a) pulley (b) wedge (c) lever (d) wheel and axle
8. 8.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a fixed pulley (b) a movable pulley
9. 9.True or false: a wheel on ball bearings gives more friction. (a) True (b) False
10. 10.Which of these is caused by gravity? (a) squeezing a lemon (b) a magnet picks up pins (c) an apple falls down (d) shoes grip the floor
11. 11.🛞 More or less friction: a rough doormat? (a) more friction (b) less friction
12. 12.🪝 A winch has a wheel of radius 4 cm and an axle of radius 1 cm. What effort on the wheel lifts a 600 N bucket on the axle, in newtons? (ideal)
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a carpet 11 N, sandpaper 12 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) sandpaper (d) ice
14. 14.🪝 What does a single fixed pulley change? (a) the direction of pull (b) the size of the load (c) gravity (d) the colour of rope
15. 15.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 12 (c) 6 (d) 3
16. 16.🛞 Friction acts … (a) with the motion (b) only on ice (c) against the motion (d) only upwards
17. 17.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) load ÷ effort (c) effort ÷ load (d) load + effort
18. 18.⚙️ Which simple machine is a bottle opener? (a) pulley (b) screw (c) lever (d) wheel and axle
19. 19.True or false: powder on a carrom board gives less friction. (a) True (b) False
20. 20.💪 Two children push a box to the right, one with 80 N and the other with 65 N. What is the net (total) force on the box, in newtons?
21. 21.💪 Which force is at work: an apple falls down? (a) magnetic force (b) gravity (c) friction (d) muscular force
22. 22.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
23. 23.💪 A cart is pulled to the right with 90 N and to the left with 75 N. Which way does the net force act? (a) no net force (b) to the left (c) to the right
24. 24.💪 In which unit do we measure force? (a) metre (m) (b) litre (L) (c) second (s) (d) newton (N)
25. 25.🔍 Which is the odd one out? (a) a nutcracker (b) a claw hammer on a nail (c) the tip of a nail (d) a crowbar
26. 26.Which of these is a pulley? (a) a nut and bolt (b) a truck loading ramp (c) a window blind cord (d) a playground slide
27. 27.🏋️ Pushing a crate 3 m took 240 J of work. What force was used, in newtons?
28. 28.🏋️ A machine lifts a load of 280 N when you push with 70 N. What is its mechanical advantage (MA)?
29. 29.⚙️ Which simple machine is the tip of a nail? (a) wedge (b) lever (c) wheel and axle (d) pulley
30. 30.True or false: a wet tiled floor gives more friction. (a) False (b) True
31. 31.🪝 A bucket weighing 50 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
32. 32.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a wooden plank 6 N, a carpet 9 N, sandpaper 12 N. Which surface gave the most friction? (a) a wooden plank (b) a carpet (c) sandpaper (d) ice
33. 33.Which of these is a lever? (a) a steering wheel (b) a knife edge (c) a door stopper (d) a claw hammer on a nail
34. 34.⚙️ Which simple machine is a crowbar? (a) wheel and axle (b) lever (c) wedge (d) pulley
35. 35.⚖️ Which class of lever is your forearm? (a) class 3 (b) class 2 (c) class 1
36. 36.🛞 More or less friction: a grippy rubber sole? (a) less friction (b) more friction
37. 37.⚖️ In a class 3 lever, what is in the middle? (a) the load (b) the pulley (c) the fulcrum (d) the effort
38. 38.💪 Which force is at work: rubbing hands warms them? (a) gravity (b) friction (c) magnetic force (d) muscular force
39. 39.⚙️ Which simple machine is a crane hook block? (a) inclined plane (b) pulley (c) lever (d) wheel and axle
40. 40.🏋️ Pushing a crate 5 m took 1300 J of work. What force was used, in newtons?

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