Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 475 · 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.🛞 How can we reduce friction in a machine? (a) add sand (b) press parts harder (c) make parts rough (d) oil the moving parts
2. 2.🏋️ Mechanical advantage (MA) = … (a) load × effort (b) effort ÷ load (c) load + effort (d) load ÷ effort
3. 3.🏋️ A smooth ramp is 6 m long and rises 1 m. What effort pushes a 1800 N box up it, in newtons? (ideal ramp, no friction)
4. 4.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
5. 5.🏋️ Pushing a crate 2 m took 920 J of work. What force was used, in newtons?
6. 6.⚖️ A seesaw balances. Ravi (140 N) sits ? m from the pivot on one side; Meena (560 N) sits 1 m from the pivot on the other side. What is the missing distance in metres?
7. 7.🪝 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
8. 8.💪 In a tug of war, one team pulls right with 80 N and the other pulls left with 25 N. What is the size of the net force, in newtons?
9. 9.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 5 m, how many metres of rope must you pull?
10. 10.🏋️ Pushing a crate 9 m took 360 J of work. What force was used, in newtons?
11. 11.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, ice 1 N, a glass sheet 2 N, a wooden plank 4 N. Which surface gave the most friction? (a) a glass sheet (b) a carpet (c) a wooden plank (d) ice
12. 12.⚙️ Which simple machine is a flagpole rope wheel? (a) wedge (b) wheel and axle (c) lever (d) pulley
13. 13.True or false: a movable pulley only changes direction. (a) True (b) False
14. 14.Which of these is caused by muscular force? (a) shoes grip the floor (b) a magnet picks up pins (c) brakes stop a bicycle (d) pedalling a cycle
15. 15.🔍 Which is the odd one out? (a) a box pushed on carpet (b) sand on a slippery path (c) a rough doormat (d) oil on a squeaky hinge
16. 16.🔍 Which is the odd one out? (a) a truck loading ramp (b) a well winch handle (c) a round doorknob (d) a water tap handle
17. 17.💪 In a tug of war, one team pulls left with 45 N and the other pulls right with 35 N. What is the size of the net force, in newtons?
18. 18.⚙️ Which simple machine is an axe blade? (a) lever (b) pulley (c) wedge (d) screw
19. 19.⚖️ Which class of lever is a broom when sweeping? (a) class 1 (b) class 3 (c) class 2
20. 20.🏋️ A force of 220 N did 440 J of work. How many metres did the object move?
21. 21.🔍 Which is the odd one out? (a) a bottle opener (b) a claw hammer on a nail (c) a nutcracker (d) a water tap handle
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 2 N, a glass sheet 6 N, a carpet 10 N. Which surface gave the least friction? (a) a glass sheet (b) a carpet (c) ice (d) sandpaper
23. 23.🏋️ A force of 40 N pushes a cart 10 m along the floor. How much work is done, in joules?
24. 24.🪝 A well winch has a handle (wheel) of radius 20 cm turning an axle of radius 5 cm. What is its mechanical advantage (MA)?
25. 25.⚖️ A lever balances when … (a) both weights are equal (b) the bar is short (c) the fulcrum moves (d) turning effects match
26. 26.True or false: pulling a cart is a push. (a) True (b) False
27. 27.⚖️ In a class 1 lever, what is in the middle? (a) the load (b) the fulcrum (c) nothing (d) the effort
28. 28.🪝 A winch has a wheel of radius 9 cm and an axle of radius 3 cm. What effort on the wheel lifts a 210 N bucket on the axle, in newtons? (ideal)
29. 29.🪝 A pulley system lifts a 300 N load with an effort of 150 N. What is its mechanical advantage (MA)?
30. 30.⚙️ Which simple machine is a road up a hill? (a) wedge (b) screw (c) pulley (d) inclined plane
31. 31.🏋️ Pushing a crate 1 m took 110 J of work. What force was used, in newtons?
32. 32.🪝 A bucket weighing 490 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
33. 33.🏋️ A force of 390 N pushes a cart 10 m along the floor. How much work is done, in joules?
34. 34.⚖️ Along a straight bar, measured from the left end, the effort is at 0 cm, the fulcrum at 30 cm and the load at 60 cm. Which class of lever is it? (a) class 2 (b) class 1 (c) class 3
35. 35.🏋️ Work is done when a force moves something … (a) only upwards (b) very slowly (c) without moving it (d) through a distance
36. 36.⚖️ Turning effect = force × … (a) distance from fulcrum (b) colour of bar (c) mass of fulcrum (d) time taken
37. 37.💪 Two children push a box to the right, one with 20 N and the other with 20 N. What is the net (total) force on the box, in newtons?
38. 38.🔍 Which is the odd one out? (a) skating on ice (b) a wet tiled floor (c) sand on a slippery path (d) a wheel on ball bearings
39. 39.⚖️ Which class of lever is a crowbar? (a) class 3 (b) class 1 (c) class 2
40. 40.True or false: a movable pulley hangs on the rope loop. (a) False (b) True

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