D. Answer the following questions.
1. Name the different types of forces and explain any two of them.
2. Name the six types of simple machines.
3. What are the different types of levers? Give two examples for each type.
4. You have to load your suitcase on to a truck. You are not able to lift the suitcase. Which
simple machine can help you do this? Why?
5. A single fixed pulley does not reduce the effort required to lift a load. How does it make our
work easier?
6. What is energy? Name the different types of energy.
7. Write a note on wind energy and solar energy.
Answers
Answer:
→1.)A force is a push or pulls acting upon an object as a result of its interaction with another object. There are a variety of types of forces.
There are 2 types of forces, contact forces, and act at a distance force. Every day you are using forces. Force basically pushes and pull. When you push and pull you are applying a force to an object.
→2.)The most notable of these are known as the "six simple machines": the wheel and axle, the lever, the inclined plane, the pulley, the screw, and the wedge, although the latter three are actually just extensions or combinations of the first three.
→3.)There are three types of levers: first class, second class and third class. The difference between the three classes depends on where the force is, where the fulcrum is and where the load is.
Common Levers
Some common types of Class 1 levers are a pair of scissors or boat oars, toilet handle, seesaw, and crowbars. Class 2 levers include wheelbarrows, bottle openers, and nail clippers. Some common types of Class 3 levers are fishing poles, mousetraps, and tongs.
→4.)Pulleys make lifting easier because more sections of rope are supporting the weight. It is much easier to pull down than to pull up a load, as our own body weight and gravity help us to pull down. Thus, a pulley is used extensively to do twice as much work with the same effort.
→5.)Such a pulley makes our work easier by simply changing the direction of the force, i.e. a load is lifted up using a downward effort. It is easier to lift a load up by pulling it down rather than by pulling it up directly. Note that a simple pulley does not reduce the effort required to lift a load.
→6.)The 6 Forms of Energy. There are many forms of energy: like solar, wind, wave and thermal to name a few, but the 6 Forms of Energy we study in Needham are: Sound, Chemical, Radiant, Electric, Atomic and Mechanical. Sound Energy- is produced when an object is made to vibrate.
→7.)Wind energy is a form of solar energy. Wind energy (or wind power) describes the process by which wind is used to generate electricity. Wind turbines convert the kinetic energy in the wind into mechanical power. A generator can convert mechanical power into electricity.
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2 ) The most notable of these are known as the "six simple machines": the wheel and axle, the lever, the inclined plane, the pulley, the screw, and the wedge, although the latter three are actually just extensions or combinations of the first three.
4 ) i don't know
5 )Such a pulley makes our work easier by simply changing the direction of the force, i.e. a load is lifted up using a downward effort. It is easier to lift a load up by pulling it down rather than by pulling it up directly. Note that a simple pulley does not reduce the effort required to lift a load.
6 ) The 6 Forms of Energy. There are many forms of energy: like solar, wind, wave and thermal to name a few, but the 6 Forms of Energy we study in Needham are: Sound, Chemical, Radiant, Electric, Atomic and Mechanical. Sound Energy- is produced when an object is made to vibrate.
7 ) Wind energy is a form of solar energy. Wind energy (or wind power) describes the process by which wind is used to generate electricity. Wind turbines convert the kinetic energy in the wind into mechanical power. A generator can convert mechanical power into electricity.
Explanation:
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