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FORCE AND
MACHINES - 2
Page 2


FORCE AND
MACHINES - 2
To do any work, we need energy. Energy is the ability to
do work. There are many forms of energy. Let us read
about some of them.
Page 3


FORCE AND
MACHINES - 2
To do any work, we need energy. Energy is the ability to
do work. There are many forms of energy. Let us read
about some of them.
HEAT ENERGY
Heat is a form of energy. Apart from sun, we get heat energy by burning of
fuels like coal, kerosene, LPG (Liquefied Petroleum Gas) and wood.
Page 4


FORCE AND
MACHINES - 2
To do any work, we need energy. Energy is the ability to
do work. There are many forms of energy. Let us read
about some of them.
HEAT ENERGY
Heat is a form of energy. Apart from sun, we get heat energy by burning of
fuels like coal, kerosene, LPG (Liquefied Petroleum Gas) and wood.
LIGHT ENERGY
Light energy helps us to see things. Sun, electric
bulb, tube light and candle are some sources of
light.
Page 5


FORCE AND
MACHINES - 2
To do any work, we need energy. Energy is the ability to
do work. There are many forms of energy. Let us read
about some of them.
HEAT ENERGY
Heat is a form of energy. Apart from sun, we get heat energy by burning of
fuels like coal, kerosene, LPG (Liquefied Petroleum Gas) and wood.
LIGHT ENERGY
Light energy helps us to see things. Sun, electric
bulb, tube light and candle are some sources of
light.
ELECTRICAL ENERGY
Appliances like fan, computer, washing
machine and television use electrical
energy. Electricity is generated at power
stations and supplied to our homes through
wires.
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FAQs on PPT: Energy and Machines - Science Class 5

1. What is the definition of force in physics?
Ans. Force is a push or pull that can change the motion or shape of an object.
2. How do machines make work easier?
Ans. Machines make work easier by either increasing the force applied or changing the direction of the force.
3. Can machines work without a force being applied?
Ans. No, machines require a force to work. Without a force, a machine cannot perform any work.
4. What are the different types of simple machines?
Ans. The six types of simple machines are the lever, pulley, wheel and axle, inclined plane, wedge, and screw.
5. How does a pulley help in using force effectively?
Ans. A pulley helps in using force effectively by changing the direction of the force applied, making it easier to lift heavy objects.
44 videos|204 docs|45 tests
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