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Laws of Motion

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Physics Part I

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Physics

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

A car of mass 1000 kg negotiates a banked curve of radius 90m on a frictionless road. If the banking angle is 45o, the speed of the car is 

  • 20 ms-1

  • 30ms-1

  • 5 ms-1

  • 10 ms-1


B.

30ms-1

The angle of banking
tan space straight theta space equals space straight v squared over rg
Given comma space straight theta space equals space 45 to the power of straight o comma space straight r equals space 90 space straight m
space and space straight g space equals space 10 space straight m divided by straight s squared
tan space 45 to the power of straight o space equals space fraction numerator straight v squared over denominator 90 space straight x space 10 end fraction
straight v space equals space square root of 90 space straight x 10 space straight x space tan space 45 to the power of straight o end root
speed space of space car space straight v space equals space 30 space straight m divided by straight s

The angle of banking
tan space straight theta space equals space straight v squared over rg
Given comma space straight theta space equals space 45 to the power of straight o comma space straight r equals space 90 space straight m
space and space straight g space equals space 10 space straight m divided by straight s squared
tan space 45 to the power of straight o space equals space fraction numerator straight v squared over denominator 90 space straight x space 10 end fraction
straight v space equals space square root of 90 space straight x 10 space straight x space tan space 45 to the power of straight o end root
speed space of space car space straight v space equals space 30 space straight m divided by straight s

639 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

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

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

Is Aristotle’s law of motion now correct?

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