force and law of motion extra questions
Answers
Answer:
According to Newton's First Law of Motion, “an object remains in a state of rest or of uniform motion in a straight line unless compelled to change that state by an applied force.” The tendency of uninterrupted objects to stay at rest or to keep moving ifinmotion with the same velocity is known as inertia.
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Answer:
Question 1.
Name the scientist who proved for the first time that objects move with constant speed when no force acts on them.
Answer:
Galileo.
Question 2.
Why do bicycles begin to slow down when we stop pedalling?
Answer:
This is because of the frictional forces acting opposite to the direction of motion.
Question 3.
Which law of motion gives the measure of force?
Answer:
Newton’s second law of motion.
Question 4.
Write the C.G.S unit of force.
Answer:
Dyne.
Question 5.
Can every force produce motion in every object?
Answer:
No.
Question 6.
When a force is applied to a body, what are the two essential effects it can produce?
Answer:
It can bring about the change in the state of motion of a body or
It can deform a body, i.e., it can change its shape.
Question 7.
Define 1 newton force.
Answer:
1 newton is the magnitude of force which produces an acceleration of 1 m/s2 in a body of mass 1 kg.
Question 8.
What do you mean by an impact force?
Answer:
The force produced by the impact of a fast moving object on another is called impact force.
Question 9.
Define force of friction.
Answer:
The force acting between any two surfaces in contact and tending to oppose motion is called force of friction.
Question 10.
Define electrostatic force.
Answer:
The force exerted by an electrically charged body is called electrostatic force.
Question 11.
If the body is found to be accelerated, is the force acting on it balanced or unbalanced?
Answer:
Unbalanced.
Question 12.
What do balanced forces usually do to a body?
Answer:
Balanced forces usually produce a change in the shape of the body.
Question 13.
When a body moves on flat surface, will its speed change?
Answer:
No.
Question 14.
What did Galileo conclude on the basis of his experiments on the motion of objects?
Answer:
A body continues to move with the same velocity if no unbalanced force acts on it.
Question 15.
What do you mean by a resultant force?
Answer:
When two or more forces act on a body simultaneously, then the single force which produces the same effect as produced by all the forces acting together is known as the resultant force.
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