20 Questions
What is the function of a simple machine?
To change the direction of a force
Which of the following is an example of a complex machine?
Electric beater
What distinguishes complex machines from simple machines?
Complex machines are made up of a number of simple machines working together
In what way do machines make our lives more comfortable?
By making work easier and faster
What type of machine is used to draw water from a well?
Simple machine
What is the term for the external force applied to a machine?
Effort
What is the term for the force against which a machine works?
Load
What is the term for the ratio of the velocity of effort to the velocity of load?
Velocity Ratio
What is the term for the fixed point about which a machine turns while doing mechanical work?
Fulcrum
What is the term for the ratio of the force that performs the useful work of a machine to the force that is applied?
Mechanical Advantage
Which type of machine is a computer based on the given text?
Complex machine
What is the primary function of a simple machine according to the text?
To multiply the magnitude of a force
Which of the following is NOT an example of a simple machine as per the text?
Electric beater
What distinguishes complex machines from simple machines based on the given text?
The use of multiple simple machines working together
In what way do machines make our lives more comfortable according to the text?
By replacing physical labour
In the context of simple machines, what is the term for the energy fed to a machine?
Input
What is the mechanical advantage of a machine if a load of 60 N is moved on applying an effort of 15 N?
$\frac{3}{2}$
Which kind of simple machine is a rigid body capable of rotating about a fixed point or axis called the fulcrum?
Lever
What does the efficiency of a machine represent?
The output to the input
What is the ratio of the velocity of effort to the velocity of load in the context of simple machines?
$\frac{\text{Distance moved by the effort}}{\text{Corresponding distance moved by the load}}$
Study Notes
Simple Machines
- The primary function of a simple machine is to make work easier by changing the direction or magnitude of the force applied.
- Examples of simple machines include levers, pulleys, wheels, and axles, inclined planes, and screws.
- Simple machines are used to make our lives more comfortable by reducing the effort required to perform a task.
Complex Machines
- A complex machine is an example of a machine made up of two or more simple machines.
- What distinguishes complex machines from simple machines is that they are made up of multiple simple machines.
Mechanical Advantage
- The term for the external force applied to a machine is effort.
- The term for the force against which a machine works is load.
- The mechanical advantage of a machine is the ratio of the force that performs the useful work of a machine to the force that is applied.
- The mechanical advantage of a machine if a load of 60 N is moved on applying an effort of 15 N is 4.
Levers
- A lever is a rigid body capable of rotating about a fixed point or axis called the fulcrum.
- The term for the fixed point about which a machine turns while doing mechanical work is fulcrum.
Efficiency
- The efficiency of a machine represents the ratio of the output energy to the input energy.
Velocity Ratio
- The term for the ratio of the velocity of effort to the velocity of load in the context of simple machines is velocity ratio.
- The velocity ratio is used to calculate the mechanical advantage of a machine.
Other Machines
- A computer is an example of a complex machine based on the given text.
- A machine used to draw water from a well is a type of simple machine.
Key Terms
- The term for the energy fed to a machine is input energy.
- The term for the ratio of the output energy to the input energy is efficiency.
Explore the impact and significance of machines in modern daily life, from increasing efficiency to providing convenience. Learn about different types of machines and their applications, and discover how they have revolutionized various industries and activities. Discover interesting facts about non-moving machines like computers and explore the diversity of energy sources used by different machines.
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