Force required to move a wooden block (Viva Voce) : Class 9 : Physics : Amrita Online Lab

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Force required to move a wooden block

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	1)	If all we know about an object is that it is moving north, what can we understand?
		There is a single force on the object directed north. There is a net force on the object directed north. There may be several forces on the object, but the largest must be directed north. Nothing about the forces on the object.

	2)	1N =………………kg.wt
		9.8 kg.wt 1/9.8 kg.wt (9.8)2 kg.wt 1/(9.8)2 kg.wt

	3)	The force acting on a mass of 1 g due to the gravitational pull on the earth is called 1 g.wt. What does one g-wt equal?
		980 dyne 9.8 N 1 N 1/9.8 N

	4)	What is the relation between a Newton and a dyne?
		1N = 1 dyne 1N = 1000000 dyne 1 N = 980 dyne 1 N = 10000 dyne

	5)	How much force is needed to produce an acceleration of 1ms-2 in a body of mass 1 kg?
		9.8 N 0.1 N 1 N 10 N

	6)	When would the weight of a body NOT be zero?
		During a free fall. On a frictionless surface. In interplanetary space. At the centre of the earth.

	7)	If a rock is brought from the surface of the moon, which of the following is true?
		Its weight will change, but not mass. Both mass and weight will change. Its mass will change. Mass of a body will remains the same.

	8)	Which Law gives the measure of force?
		Newton’s First Law Newton’s Second Law Newton’s Third Law Impulse of the force

	9)	A rain drop of mass 0.1 g is falling with uniform speed of 10 cms-1. What is the net force acting on the drop?
		Zero 0.001 N 0.02 N 0.01 N

	10)	Which of the following is a vector quantity?
		Force Momentum Displacement All of these

	11)	What is the physical quantity that takes into account the combined effect of mass and velocity?
		Momentum Torque Moment of momentum Moment of force

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Developed by Amrita University & CDAC Mumbai. Funded by MeitY (Ministry of Electronics & Information Technology)

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