![]() Now, if both ends are pulled by a 10kg weight, the tension is 10kg, and the reading will be 10kg. As the spring balancing is based on the tension in the spring, it reads weight. What will be the reading of the balance?Īns. The two ends of spring - balance are pulled each by a force of 10kg.wt. The direction of motion of the body, however, will be altered.ĩ. Since W = F.S cosθ, where S = 90° and cos90° = 0, therefore W = 0.Īs a result, the magnitude of the body's velocity (or speed) will remain unchanged. When a force acts in a perpendicular direction on a moving body, the work done by the force is zero. If force is acting on a moving body perpendicular to the direction of motion, then what will be its effect on the speed and direction of the body?Īns. Because a force of action and response always operates on two separate bodies, action and reaction do not balance each other.Ĩ. Action and reaction forces do not balance each other. So, mathematically it can be written as: Weight of the box, W=m(g-a)=m(g-g)=0.ħ. So, the weight of the box experience by the thief during the jump will be zero. Both he/she and the box will be weightless during that time. The thief is in free fall during the jump. What will be the weight of the box as experienced by the thief during jump?Īns. A thief jumps from the roof of a house with a box of weight W on his head. Friction is a self-adjusting force that changes in magnitude from zero to maximum to limit friction.Ħ. As a result, in order to swim ahead, the swimmer pushes water backward with his hands.ĥ. From the Newton's 3rd laws of motion, we know that "when one body exerts a force on the other body, the first body experiences a force equivalent in magnitude in the opposite direction of the force exerted". Why does a swimmer push the water backwards?Īns. ![]() A gunman must keep his weapon securely against his shoulder when shooting.Ĥ. Here the gun and the shoulder are one mass system, due to this the back kick will be reduced. As the gun recoils after shooting, it must be held softly on the shoulder. Why is it desired to hold a gun tight to one's shoulder when it is being fired?Īns. The frictional force between the tyres and the road provides centripetal force.ģ. What provides the centripetal force to a car taking a turn on a level road?Īns. The materials of the surfaces in contact.Ģ. The coefficient of friction will mainly depend upon two factors, they are as following:ġ. Name the factor on which coefficient of friction depends?Īns.
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