Engineering Worksheet: Part 2 Test

Engineering lesson 16: Part 2 test: forces and machines · Set 277 · 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 lever bar balances. The load is 200 N at ? cm from the fulcrum. The effort is 80 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
2. 2.🛞 More or less friction: skating on ice? (a) more friction (b) less friction
3. 3.🪝 What does a single fixed pulley change? (a) the colour of rope (b) gravity (c) the direction of pull (d) the size of the load
4. 4.True or false: a crowbar is a wedge. (a) True (b) False
5. 5.🛞 Friction acts … (a) against the motion (b) only on ice (c) only upwards (d) with the motion
6. 6.True or false: a well-bucket rope wheel is a pulley. (a) True (b) False
7. 7.True or false: a movable pulley only changes direction. (a) True (b) False
8. 8.⚙️ Which simple machine is a crowbar? (a) lever (b) screw (c) wedge (d) inclined plane
9. 9.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) helpful (b) a problem
10. 10.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) skating on ice (c) a grippy rubber sole (d) oil on a squeaky hinge
11. 11.🪝 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
12. 12.🏋️ A 15 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
13. 13.💪 A bag has a mass of 1 kg. Taking 1 kg to weigh about 10 N, what is its weight in newtons?
14. 14.⚖️ Along a straight bar, measured from the left end, the effort is at 70 cm, the fulcrum at 30 cm and the load at 100 cm. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
15. 15.🏋️ A machine lifts a load of 250 N when you push with 50 N. What is its mechanical advantage (MA)?
16. 16.⚖️ What is the pivot point of a lever called? (a) the axle (b) the load (c) the fulcrum (d) the effort
17. 17.🔍 Which is the odd one out? (a) a grippy rubber sole (b) a wheel on ball bearings (c) a rough doormat (d) a tyre with deep treads
18. 18.⚖️ A lever bar balances. The load is 180 N at 30 cm from the fulcrum. The effort is 270 N at ? cm from the fulcrum on the other side. What is the missing distance in centimetres?
19. 19.💪 A cart is pulled to the right with 25 N and to the left with 35 N. Which way does the net force act? (a) to the right (b) to the left (c) no net force
20. 20.⚖️ On a seesaw, a heavier child should sit … (a) closer to the pivot (b) farther from the pivot (c) anywhere (d) on the pivot
21. 21.🔍 Which is the odd one out? (a) a box pushed on carpet (b) skating on ice (c) a grippy rubber sole (d) a tyre with deep treads
22. 22.Which of these is caused by friction? (a) shoes grip the floor (b) a magnet picks up pins (c) lifting a school bag (d) an apple falls down
23. 23.🏋️ A force of 320 N pushes a cart 6 m along the floor. How much work is done, in joules?
24. 24.True or false: a rough doormat gives less friction. (a) True (b) False
25. 25.🏋️ A force of 410 N pushes a cart 10 m along the floor. How much work is done, in joules?
26. 26.⚖️ Along a straight bar, measured from the left end, the effort is at 30 cm, the fulcrum at 80 cm and the load at 70 cm. Which class of lever is it? (a) class 1 (b) class 3 (c) class 2
27. 27.⚙️ A wedge is … (a) a wheel on a rod (b) two ramps back to back (c) a rope on a wheel (d) a bar on a pivot
28. 28.⚙️ Which simple machine is a seesaw? (a) screw (b) pulley (c) lever (d) inclined plane
29. 29.💪 Is drawing up a well bucket a push or a pull? (a) a pull (b) a push
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 8 N, a carpet 11 N, sandpaper 12 N. Which surface gave the least friction? (a) a glass sheet (b) sandpaper (c) a carpet (d) ice
31. 31.💪 A box weighs 260 N. Taking 1 kg to weigh about 10 N, what is its mass in kilograms?
32. 32.🏋️ A 14 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
33. 33.True or false: a movable pulley stays in one place. (a) False (b) True
34. 34.⚖️ Going along a lever from one end to the other, the order is: fulcrum, effort, load. Which class of lever is it? (a) class 1 (b) class 2 (c) class 3
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 7 N, a carpet 8 N, ice 1 N, a glass sheet 4 N. How many newtons more were needed on a carpet than on ice?
36. 36.Which of these is a lever? (a) a water tap handle (b) a truck loading ramp (c) a bottle cap (d) a nutcracker
37. 37.⚖️ In a class 3 lever, what is in the middle? (a) the fulcrum (b) the load (c) the effort (d) the pulley
38. 38.True or false: chalk on a gym bar gives less friction. (a) False (b) True
39. 39.⚙️ A screw is really … (a) a bent lever (b) a kind of wheel (c) a tiny pulley (d) a ramp wrapped round
40. 40.💪 Which can a force NOT do? (a) change its colour (b) change its shape (c) stop it moving (d) start it moving

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