Thread: Dynamics 2

Hello Everyone, please help me on this dynamics questions!

A boy pulls a sled across ice by exerting a force of F kg wt. The mass of the sled is m kg, the friction between sled and ice is negligible but the sled is subject to air resistance in kg wt of magnitude k times the speed. If the sled starts from rest find expressions for:
i) Velocity as a function of time
and
ii) Displacement as a function of velocty

Originally Posted by Modernized

Hello Everyone, please help me on this dynamics questions!

A boy pulls a sled across ice by exerting a force of F kg wt. The mass of the sled is m kg, the friction between sled and ice is negligible but the sled is subject to air resistance in kg wt of magnitude k times the speed. If the sled starts from rest find expressions for:
i) Velocity as a function of time
and
ii) Displacement as a function of velocty

.

i) Solve for v, subject to v = 0 when t = 0.

ii) Solve for x, subject to x = 0 when t = 0.

Originally Posted by Modernized

Hello Everyone, please help me on this dynamics questions!

A boy pulls a sled across ice by exerting a force of F kg wt. The mass of the sled is m kg, the friction between sled and ice is negligible but the sled is subject to air resistance in kg wt of magnitude k times the speed. If the sled starts from rest find expressions for:
i) Velocity as a function of time
and
ii) Displacement as a function of velocty

Go back to your teacher and tell them to get a different text book or problem set. The unit of force in SI is the Newton (a force which will accellerate a mass of 1 kg at 1 m/2^2) not a kg weight or force.

CB