Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 478 · 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 smooth ramp is 18 m long and rises 3 m. What effort pushes a 4200 N box up it, in newtons? (ideal ramp, no friction)
2. 2.True or false: a pair of tweezers is a class 2 lever (load in the middle). (a) True (b) False
3. 3.True or false: pulling up your socks is a push. (a) True (b) False
4. 4.💪 Two children push a box to the right, one with 100 N and the other with 70 N. What is the net (total) force on the box, in newtons?
5. 5.⚖️ Which class of lever is your forearm? (a) class 1 (b) class 2 (c) class 3
6. 6.🏋️ A force of 90 N pushes a cart 1 m along the floor. How much work is done, in joules?
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 5 N, a carpet 6 N, sandpaper 10 N. Which surface gave the most friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet
8. 8.⚙️ Which simple machine is a bottle opener? (a) screw (b) lever (c) wedge (d) pulley
9. 9.Which of these is caused by friction? (a) rain falls to the ground (b) a river flows downhill (c) squeezing a lemon (d) brakes stop a bicycle
10. 10.🔍 Which is the odd one out? (a) skating on ice (b) oil on a squeaky hinge (c) a wheel on ball bearings (d) chalk on a gym bar
11. 11.🪝 What does a single fixed pulley change? (a) the direction of pull (b) the colour of rope (c) the size of the load (d) gravity
12. 12.True or false: a jar lid is a screw. (a) False (b) True
13. 13.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 90 N at 70 cm from the fulcrum on the other side. What is the missing force in newtons?
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 8 N, a glass sheet 1 N, a wooden plank 3 N, a carpet 7 N. Which surface gave the least friction? (a) sandpaper (b) a carpet (c) a glass sheet (d) a wooden plank
15. 15.💪 Is kicking a football a push or a pull? (a) a pull (b) a push
16. 16.🔍 Which is the odd one out? (a) a crane hook block (b) a window blind cord (c) a flagpole rope wheel (d) a playground slide
17. 17.True or false: skating on ice gives less friction. (a) False (b) True
18. 18.True or false: a seesaw is a class 2 lever (load in the middle). (a) False (b) True
19. 19.⚖️ A seesaw balances. Zoya (720 N) sits 1 m from the pivot on one side; Arjun (? N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
20. 20.🛞 More or less friction: a smooth steel slide? (a) more friction (b) less friction
21. 21.💪 Is opening a drawer a push or a pull? (a) a pull (b) a push
22. 22.🏋️ A smooth ramp is 9 m long and rises 3 m. What effort pushes a 1200 N box up it, in newtons? (ideal ramp, no friction)
23. 23.🛞 More or less friction: a box pushed on carpet? (a) less friction (b) more friction
24. 24.🛞 Friction acts … (a) against the motion (b) only on ice (c) only upwards (d) with the motion
25. 25.💪 In a tug of war, one team pulls left with 30 N and the other pulls right with 15 N. What is the size of the net force, in newtons?
26. 26.⚙️ A screw is really … (a) a bent lever (b) a ramp wrapped round (c) a tiny pulley (d) a kind of wheel
27. 27.⚖️ Turning effect = force × … (a) distance from fulcrum (b) time taken (c) mass of fulcrum (d) colour of bar
28. 28.💪 In a tug of war, one team pulls right with 50 N and the other pulls left with 30 N. What is the size of the net force, in newtons?
29. 29.💪 Which force is at work: a magnet picks up pins? (a) friction (b) gravity (c) magnetic force (d) muscular force
30. 30.🪝 Fixed or movable pulley: which one halves the effort? (a) a fixed pulley (b) a movable pulley
31. 31.⚙️ Which simple machine is a claw hammer on a nail? (a) wheel and axle (b) lever (c) wedge (d) inclined plane
32. 32.🏋️ Pushing a crate 1 m took 280 J of work. What force was used, in newtons?
33. 33.⚙️ How many simple machines are there in the usual list? (a) 10 (b) 3 (c) 6 (d) 12
34. 34.⚖️ Along a straight bar, measured from the left end, the effort is at 50 cm, the fulcrum at 0 cm and the load at 10 cm. Which class of lever is it? (a) class 3 (b) class 1 (c) class 2
35. 35.💪 Two children push a box to the right, one with 80 N and the other with 20 N. What is the net (total) force on the box, in newtons?
36. 36.🏋️ A longer ramp to the same height needs … (a) no effort (b) more effort (c) the same effort (d) less effort
37. 37.🛞 Why are tyres made with deep treads? (a) to save rubber (b) to grip the road (c) to look nice (d) to go slower
38. 38.⚖️ Going along a lever from one end to the other, the order is: load, effort, fulcrum. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
39. 39.⚖️ In a class 1 lever, what is in the middle? (a) nothing (b) the fulcrum (c) the load (d) the effort
40. 40.🏋️ In which unit is work measured? (a) newton (N) (b) watt hour (c) metre (m) (d) joule (J)

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