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Laws of Motion

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Physics Part I

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Physics

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Class 10 Class 12

A mass m moving horizontally (along the x -axis) with velocity v collides and sticks to mass of 3m moving vertically upward (along the y -axis) with velocity 2v. The final velocity of the combination

  • 1 half straight v space bold i with bold hat on top space plus 3 over 2 straight v space bold j with bold hat on top
  • 1 third straight v space bold i with bold hat on top space plus 2 over 3 straight v space bold j with bold hat on top
  • 2 over 3 straight v space bold i with bold hat on top space plus 1 third straight v space bold j with bold hat on top
  • 3 over 2 straight v space bold i with bold hat on top space plus 1 fourth straight v space bold j with bold hat on top

A.

1 half straight v space bold i with bold hat on top space plus 3 over 2 straight v space bold j with bold hat on top

From the law of conservation of linear momentum



mv + (3m)(2v) = (4m)v'

mv + 6mv j = 4 mv'


straight v apostrophe space equals space 1 fourth space straight v space bold i space plus space 6 over 4 space straight v space bold j

straight v apostrophe space equals space 1 fourth space straight v space bold i bold space plus 3 over 2 space straight v space bold j

From the law of conservation of linear momentum



mv + (3m)(2v) = (4m)v'

mv + 6mv j = 4 mv'


straight v apostrophe space equals space 1 fourth space straight v space bold i space plus space 6 over 4 space straight v space bold j

straight v apostrophe space equals space 1 fourth space straight v space bold i bold space plus 3 over 2 space straight v space bold j

970 Views

When the branches of an apple tree are shaken, the apples fall down. Why?

The apple fall from an apple tree when it shaken because of inertia of rest. Apple is in a state of rest and when the tree is suddenly shaken, apples still tends to remain in it's same state of rest whereas branches move. 

So, the apples fall down. 
1475 Views

State Galileo’s law of motion.

Galileo’s law of motion states that, a body continues to move in the same direction with constant speed, if no force is acting on the body. 
1332 Views

Is Aristotle’s law of motion now correct?

No. Aristotl'e law of motion is false. 
1233 Views

Define inertia.

The property by virtue of which the body cannot change its state of rest or uniform motion in a straight line, unless an external force is acting on the body is called as Inertia. 
1316 Views

What is Aristotle’s law of motion?

Aristotle’s law of motion states that an external force is required to keep the body in motion.
2445 Views