D. Answer the following questions.
1. What is force? What is meant by gravitational force?
2. What is meant by force of friction?
3. What is energy? How is it different from work?
47 How is Sun the most important source of energy?
5. What are the differences between renewable and non-renewable
resources? Give examples.
HOTS QUESTIONS
1. Why is it said that all the energy we use comes from the sun?
2. What is the effect of force on a moving object when it is applied in the same
direction?
Answers
Answer:
force is a push or pull of thing .for ex we push the box.and gravitational force is a force that attract two object due their mass.for ex the force that cause when you throw a ball in air and ball come down.
Answer:
1.Push or Pull on an object is called force. Gravitational force is a type of non contact force which is exerted by earth toward S it's centre.
2.Force also causes friction for example a sliding friction occurs due to force generated by external factors.
3.Energy is the capacity to do work it is different from work as work is the object we have to do and energy it's the ability to do working.
4.Sun it's most important sources of energy because it gives light to all around earth and it is also main sources of light.
5.renewable source are those which can be renewed again and again for ex sunlight and resource which can't be renewed again and again it's called non renewable resource ex coal and petroleum
HOTS
1.because it is main sources of energy for ex solar panel work with the help of sunlight
2.the motion of the body increases
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