12. Define the term force.
13. Define unbalanced forces.
5.
14. State Newton's first law of motion.
15. What do you mean by inertia ?
16. Name the factors on which momentum of a body depends.
17. Define momentum of a body.
18. State Newton's third law of motion.
19. State law of conservation of momentum.
20.
What is the name given to the product of mass and velocity of a body?
21. Name the principle on which a rocket works.
Answers
Answer:
12) Force is a push or a pull that changes or tends to change the state of rest or uniform motion of an object or changes the direction or shape of an object
13) When two forces acting on an object are not equal in size, we say that they are unbalanced forces. ... a stationary object starts to move in the direction of the resultant force. a moving object changes speed and/or direction in the direction of the resultant force.
14) Newton's 1st law states that a body at rest or uniform motion will continue to be at rest or uniform motion until and unless a net external force acts on it. ... If that velocity is zero, then the object remains at rest. And if an additional external force is applied, the velocity will change because of the force.
15) Inertia is the resistance of any physical object to any change in its velocity. This includes changes to the object's speed, or direction of motion.
16) Momentum depends upon the variables mass and velocity. In terms of an equation, the momentum of an object is equal to the mass of the object times the velocity of the object.
17) Momentum is the physical quantity which is the measure of the quantity of motion of a moving body. It depends on mass and velocity of the body.
18) Newton's third law: If an object A exerts a force on object B, then object B must exert a force of equal magnitude and opposite direction back on object A. ... We sometimes refer to this law loosely as action-reaction, where the force exerted is the action and the force experienced as a consequence is the reaction.
19)The conservation of momentum states that, within some problem domain, the amount of momentum remains constant; momentum is neither created nor destroyed, but only changed through the action of forces as described by Newton's laws of motion.
20) momentum is the name given to the product of mass and velocity of a body.
21) Rocket works on the principle of conservation of momentum. Rocket ejaculates gases in backward direction which creates momentum of the gases backwards and thus by conservation of momentum, the rocket gets momentum in the forward direction making it move forward.
13) when two forces of unequal magnitude but acting in opposite direction or an object simultaneously, then the object moves in the direction of large force such force acting on the object are known as unbalanced force.
14) The 1st law of motion states that 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.
15) The tendency of undisturbed objects to stay at rest or to keep moving with the same velocity or direction is called inertia.
16) mass and velocity
17) momentum is defined as product of mass and velocity
P = mv
18) The third law of motion states that for every action, there is an equal and opposite reaction.
20) Momentum
21) conservation of momentum
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