Effort/ Load simple machines question

In summary, the conversation discusses the use of a screw jack on cars for changing tires. The screw moves a distance equal to its pitch with each complete turn of the effort lever (jack handle). With a handle length of 24cm, pitch of 2mm, and 100% efficiency, the problem asks for the effort required to lift a 900kg vehicle. The equations used are velocity ratio and mechanical advantage, and there is confusion about the calculation due to being new to physics.
  • #1
IdleTorque
7
0

Homework Statement


A screw jack that is used on cars whenever tyres are changed by the owner. The screw moves though a distance equal to its pitch whenever the effort lever ( jack handle) is given a complete turn. If the length of the jack handle is 24cm, the pitch is 2mm and the jack is required to lift a 900kg vheicle. Assuming efficiency is 100%. calculate the Effort reqired to lift the car.

Given Length of 24cm
Pitch of 2mm
Mass of 900kg
100% efficiency

Homework Equations


Velocity ratio
Mechanical advantage

The Attempt at a Solution



VR = 2
MA = L/E

900/2

450kg
 
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  • #2
helppppp
 
  • #3
no help for this?

I've also assumed as the handle of 24cm goes around 1 complete turn, the jack goes up 2mm. Also gravity on the 900kg of the Load.

But its so confusing. And I'm new to physics can someone help me..
 

Related to Effort/ Load simple machines question

1. What is the definition of effort and load in simple machines?

Effort is the force applied to a simple machine to make it work, while load is the resistance that the machine is trying to overcome.

2. How do you calculate the mechanical advantage of a simple machine?

The mechanical advantage of a simple machine is calculated by dividing the load by the effort. This ratio represents how much easier it is to lift or move a load using the simple machine compared to doing it without the machine.

3. What are the different types of simple machines?

The six types of simple machines are lever, pulley, wheel and axle, inclined plane, wedge, and screw. Each type has a specific function and can be found in various everyday objects.

4. How does friction affect the efficiency of simple machines?

Friction can decrease the efficiency of simple machines by causing energy to be lost as heat. This means that more effort is needed to overcome the resistance of the load. Lubricants can be used to reduce friction and increase efficiency.

5. Can simple machines be combined to create more complex machines?

Yes, simple machines can be combined in different ways to create more complex machines that can perform more tasks. For example, a wheel and axle can be combined with a lever to create a wheelbarrow, which is a compound machine.

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