class 9 force and laws of motion questions paper
Answers
Explanation:
VERY SHORT ANSWER QUESTIONS....
* Question 1.
Name the physical quantity, which changes the shape of a ball.
* Answer:
Force.
* Question 2.
Define the term force. (CBSE 2011, 2012, 2014)
* Answer:
A force is a physical quantity which causes or tends to cause a motion in an object at rest or changes or tends to change the direction of motion of a moving object or the shape or size of the object.
* Question 3.
Define balanced forces. (CBSE 2013)
Or
State the meaning of balanced forces. (CBSE 2012)
Answer:
Two equal and opposite forces acting simultaneously on an object are known as balanced forces. The resultant force due to balanced forces is zero.
* Question 4.
Define unbalanced forces. (CBSE 2013)
Answer:
Two forces of unequal magnitudes and acting in opposite directions on an object simultaneously are known as unbalanced forces. The resultant force due to unbalanced forces is non zero.
Question 5.
Name the force which is responsible for change in position or state of an object. (CBSE 2012, 2013)
Answer:
Unbalanced force.
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