D. Answer the following questions in brief:
1. An object experiences a net non-zero force. Is it possible for the object to travel with
a constant speed in a straight line?
2. "Snow shoes are more effective for walking on snow than ordinary shoes. Why?
3. When we throw a ball upwards, what happens to its speed while it is going up? Give
reason for your answer.
4. Give two examples, from daily life, where a force may change the shape of an object.
5. Distinguish between contact and non-contact forces giving examples.
6. Explain why porters' place a round piece of cloth on their heads when they carry heavy
loads,
the friction in
snow the
Answers
Answer:
1..Answer to your question is , therefore, it will certainly move with constant speed.
Whenever there is a non-zero net force, it will constantly changing the speed or velocity of the object. ...
2. Snow shoes with spikes are more effective for walking on snow than ordinary shoes because they create more friction as compared to ordinary one which is necessary for walking on a slippery surface as snow.
3. When we throw a ball upwards, its speed retards gradually. This is because the earth produces a gravitational force which brings down everything that goes up. So when a ball is thrown upward the gravity applies force to bring it down which decreases its speed of going up...
4..a)When you bounce a ball, the wall of the ball is temporarily compressed
b)When you squeeze a lump of clay..
5. A non-contact force is a force which acts on an object without coming physically in contact with it. The most familiar example of a non-contact force is gravity, which confers weight. In contrast a contact force is a force applied to a body by another body that is in contact with it.
6. The round piece of cloth on their heads increases the area on which the force (weight of the load) will act. We know that, the pressure is inversely proportional to area. Therefore, increase in area reduces the pressure and this helps the porter to carry the heavy load easily....
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