WHITEBOARD TIME !! LET’S DO SOME F ·d ·cos  !!!.

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Presentation transcript:

WHITEBOARD TIME !! LET’S DO SOME F ·d ·cos  !!!

A warehouse worker has just unloaded a 120 kg crate full of spare parts. The worker pulls the crate at constant velocity exerting a constant force of 294 N through a displacement of 100 m. 1.Draw a motion diagram 2.Draw a force Diagram. 3.Find the magnitude of all forces exerted on the crate. 4.Find the work done by all forces on the crate. 5.Find the total work (net work) done on the crate. 6.Draw a graph F vs d. (find the area of the graph).

A kg hockey puck slides along an ice rink. It slows down to stop over a displacement of 20 m. Note: The coefficient of kinetic friction between the puck and ice is Draw a motion diagram. 2.Draw a force Diagram. 3.Find the magnitude of all forces exerted on the puck. 4.Find the work done by all forces on the puck. 5.Find the total work (net work) done on the puck. 6.Draw a graph F vs d. (find the area of the graph).

A tractor pulls a 1500 kg sled of firewood. The force exerted by the rope on the tractor is º. The sled moves at a constant velocity. 1.Draw a force Diagram. 2.Find the magnitude of all forces exerted on the sled. 3.Find the work done by all forces on the sled. 4.Find the total work (net work) done on the sled. 5.Find the coefficient of kinetic friction between the sled and the ground.

6.Draw a graph F TX vs d. 7.Find the area between the graph and the axis, between dx=0m and dx=100m. 8.What is the meaning of this area?