Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 679 · 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.⚙️ Which simple machine is a seesaw? (a) pulley (b) lever (c) wedge (d) inclined plane
2. 2.🏋️ A smooth ramp is 5 m long and rises 1 m. What effort pushes a 250 N box up it, in newtons? (ideal ramp, no friction)
3. 3.⚙️ A wedge is … (a) a wheel on a rod (b) a bar on a pivot (c) a rope on a wheel (d) two ramps back to back
4. 4.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 11 N, sandpaper 14 N, ice 4 N. How many newtons more were needed on sandpaper than on ice?
5. 5.💪 A box weighs 20 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
6. 6.True or false: a fixed pulley needs effort = load. (a) False (b) True
7. 7.🏋️ Pushing a crate 3 m took 1350 J of work. What force was used, in newtons?
8. 8.⚖️ A lever bar balances. The load is 480 N at 20 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?
9. 9.💪 Is plucking a mango a push or a pull? (a) a pull (b) a push
10. 10.Which of these is a lever? (a) a crane hook block (b) a crowbar (c) a window blind cord (d) a flagpole rope wheel
11. 11.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the load (c) the pulley (d) the effort
12. 12.⚙️ Which simple machine is a round doorknob? (a) lever (b) wheel and axle (c) wedge (d) inclined plane
13. 13.🏋️ Pushing a crate 8 m took 1680 J of work. What force was used, in newtons?
14. 14.🪝 A load of 90 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
15. 15.⚖️ A lever balances when … (a) the bar is short (b) both weights are equal (c) the fulcrum moves (d) turning effects match
16. 16.⚙️ Which simple machine is a jar lid? (a) wedge (b) lever (c) screw (d) inclined plane
17. 17.🏋️ A force of 50 N pushes a cart 9 m along the floor. How much work is done, in joules?
18. 18.Which of these is caused by friction? (a) lifting a school bag (b) a thrown ball comes down (c) a magnet picks up pins (d) rubbing hands warms them
19. 19.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
20. 20.True or false: a screw jack is a wedge. (a) False (b) True
21. 21.🪝 Fixed or movable pulley: which one needs effort = load? (a) a movable pulley (b) a fixed pulley
22. 22.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
23. 23.🪝 A wheel and axle is a big wheel fixed to … (a) a flat ramp (b) a loose rope (c) a sharp wedge (d) a smaller rod (axle)
24. 24.True or false: a seesaw is a class 2 lever (load in the middle). (a) False (b) True
25. 25.🏋️ A force of 500 N pushes a cart 4 m along the floor. How much work is done, in joules?
26. 26.🏋️ A force of 390 N pushes a cart 7 m along the floor. How much work is done, in joules?
27. 27.⚙️ A screw is really … (a) a bent lever (b) a kind of wheel (c) a ramp wrapped round (d) a tiny pulley
28. 28.💪 Two children push a box to the right, one with 75 N and the other with 15 N. What is the net (total) force on the box, in newtons?
29. 29.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 7 m, how many metres of rope must you pull?
30. 30.⚖️ What is the pivot point of a lever called? (a) the fulcrum (b) the axle (c) the load (d) the effort
31. 31.True or false: opening a drawer is a push. (a) False (b) True
32. 32.Which of these is an inclined plane? (a) a nut and bolt (b) a crane hook block (c) a truck loading ramp (d) a steering wheel
33. 33.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, sandpaper 9 N, ice 1 N, a glass sheet 4 N. Which surface gave the most friction? (a) a wooden plank (b) ice (c) a glass sheet (d) sandpaper
34. 34.🛞 Friction acts … (a) against the motion (b) only upwards (c) with the motion (d) only on ice
35. 35.True or false: a wheelbarrow is a class 3 lever (effort in the middle). (a) False (b) True
36. 36.⚖️ Going along a lever from one end to the other, the order is: effort, load, fulcrum. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
37. 37.Which of these is caused by friction? (a) a thrown ball comes down (b) a rolling ball slows (c) rain falls to the ground (d) an apple falls down
38. 38.🪝 A winch has a wheel of radius 25 cm and an axle of radius 5 cm. What effort on the wheel lifts a 600 N bucket on the axle, in newtons? (ideal)
39. 39.⚖️ In a class 1 lever, what is in the middle? (a) the fulcrum (b) the load (c) nothing (d) the effort
40. 40.Which of these is caused by magnetic force? (a) lifting a school bag (b) an apple falls down (c) pedalling a cycle (d) a magnet picks up pins

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