1.

When a horizontal force P acts on a cart of mass 2kg, it moves with a uniform acceleration on a horizontal floor. When a force of 1.2P acts on the cart, it moves with an acceleration of 0.05m/s^2. Find the value of P

Answer»

Given :-

When a horizontal force P acts on a cart of mass 20 kg,it moves with a uniform velocity on a horizontal FLOOR. When a force of 1.2P acts on the cart, it moves with an acceleration of 0.05 metre per second square. Find the value of P.

Solution :-

  • SINCE in the first case the body moves with a uniform velocity , the resultant force on it in the horizontal DIRECTION must be zero .

H + force of friction = 0

or , force of friction = -H.

  • In the second case , the net horizontal force is ( 1.5 H - H ) = 0.5H.

Applying Newton's second law ,

→ F = ma

→ 0.5 H = 50 kg × 0.1 m/s²

→ H = ( 50 kg × 0.1 m/s² ) / 0.5 = 10 N .

Thank You !


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