Simple Machines: Levers, Pulleys, and Gears

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Questions and Answers

How much force is required to lift the weight?

60 lbs

Which weight requires the least force to move?

B (correct)

Both require the same force

What will be the total distance that the springs in parallel are compressed?

5 cms

How many switches need to be closed to light up one bulb?

2 Signup and view all the answers

How many bulbs will light up when the switch is closed?

4 Signup and view all the answers

If bulb 1 is removed, how many bulbs will light up when the switch is closed?

2 Signup and view all the answers

How much weight is required to balance the lever?

7.5Kg Signup and view all the answers

How far from the fulcrum does the 60 lb weight need to be to balance the lever?

12 ft Signup and view all the answers

Approximately how much force is needed to lift the weight?

40 lbs Signup and view all the answers

If gear X turns clockwise at a constant speed of 10 rpm. How does gear Y turn?

c/w 5 rpm Signup and view all the answers

If bar Y moves left at a constant speed. How does bar X move?

Left, Same Signup and view all the answers

If drive wheel X rotates clockwise at a speed of 10 rpm. How does wheel Y turn?

anti c/w slower Signup and view all the answers

How much force is required to compress three springs in parallel 10cm?

7.5 Kg Signup and view all the answers

What is the approximate area of the component in square centimetres?

4688 Signup and view all the answers

What is the approximate percentage of steel wasted?

35% Signup and view all the answers

How many components can be produced from each 30 meter coil?

37 Signup and view all the answers

What is the approximate cost of a component if the scrap is sold at 50% of cost?

$3.55 Signup and view all the answers

How far does B need to move to lift the weight 6 feet?

18 ft Signup and view all the answers

Which of the pulley systems shown are stable?

Y & Z Signup and view all the answers

What will be the total distance that the springs in series are compressed?

5 cms Signup and view all the answers

How many bulbs will light when switches 1, 2, 3 and 4 are closed?

Two Signup and view all the answers

What is the approximate total volume of the component in cubic centimetres?

775 Signup and view all the answers

What is the approximate weight of the component?

3.6Kg Signup and view all the answers

Which figure is identical to the first?

B Signup and view all the answers

Which group of shapes can be assembled to make the shape shown?

C Signup and view all the answers

Which shape can be assembled using all of the individual shapes shown?

C Signup and view all the answers

Which pattern can be folded to make the cube shown?

A Signup and view all the answers

Study Notes

Levers

A lever is a bar that pivots at a fixed point called the fulcrum.
Levers can be used to reduce the force needed to move an object.
The force needed to lift a weight on a lever is calculated using the formula: Force = (Weight x Distance from fulcrum to weight) / Distance from fulcrum to point where force is applied.
If the fulcrum is moved closer to the weight, less force is required to lift it.

Pulleys

Pulleys consist of a grooved wheel and a block.
A rope runs in the groove around the wheel to lift a weight or other object.
A fixed pulley requires a force equal to the weight to lift it.
A pulley that moves with the weight requires a force equal to half the weight to be lifted.
Pulleys reduce the force required to lift a weight.

Gears

Gears are toothed wheels or cylinders that mesh with another toothed component to transmit motion or to change speed or direction.
Gears can be connected directly or by a chain or belt.
Adjacent gears turning in the same direction, turn in opposite directions.
When the gears are connected to the same shaft and turn in the same direction, they are turning in the same direction as each other.

Springs

A spring is a piece of wire or metal that stretches or compresses when a force is applied but returns to its original length when the force is removed.
Springs behave linearly; doubling the force applied will stretch or compress the spring twice as much.
Springs can be arranged in series or in parallel
Series: The force in each spring is equal; parallel springs each spring share an equal amount of the force.

Electricity

Questions on electricity often use diagrams showing the power source, switches, loads (like bulbs), and wires.
For circuits to work, the path of the wiring needs to be complete.
Two switches have to be closed to complete a circuit correctly.

Mechanical IQ

Multiple questions on levers, pulleys, gears and springs are presented.
Various formulas for levers, pulleys, and springs are needed to solve the questions.
The student needs to show understanding of concepts to calculate answers.

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Description

Explore the fundamental concepts of levers, pulleys, and gears in this quiz. Learn how these simple machines can reduce the effort needed to perform tasks by understanding their mechanics and formulas. Test your knowledge on their functions and applications in everyday life.