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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 block of mass m is in contact with the cart C as shown in the figure

The coefficient of static friction between the block and the cart is μ. The acceleration α of the cart that will prevent the block from falling satisfies

  • straight alpha space greater than mg over straight mu
  • straight alpha space greater than space straight g over μm
  • straight alpha space greater or equal than space straight g over straight mu
  • straight alpha space less than space straight g over straight mu

C.

straight alpha space greater or equal than space straight g over straight mu

When a cart moves with some acceleration toward right then a pseudo force (mα) acts on block towards left. The force (mα) is action force by a block on the cart. Now, block will remain static w.r.t cart if frictional force 

μR space greater or equal than space mg

rightwards double arrow space straight mu space mα space greater or equal than space mg space space space left square bracket space as space straight R space equals space mα right square bracket

rightwards double arrow space straight alpha space greater or equal than space straight g over straight mu

When a cart moves with some acceleration toward right then a pseudo force (mα) acts on block towards left. The force (mα) is action force by a block on the cart. Now, block will remain static w.r.t cart if frictional force 

μR space greater or equal than space mg

rightwards double arrow space straight mu space mα space greater or equal than space mg space space space left square bracket space as space straight R space equals space mα right square bracket

rightwards double arrow space straight alpha space greater or equal than space straight g over straight mu

2195 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

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

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

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

Is Aristotle’s law of motion now correct?

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