1. Work and Power

2. What amount of work is done in lifting a 100 kg crate a distance of 2 meters?mg
What amount of work is done on the crate if it is carried 3m horizontally at a constant speed? mg

3. What amount of work is done by a 40 N force applied at an angle of 30 degrees to the horizontal as it moves a 100 N block a distance of 4 m across a floor?
What is the power if the motion takes 5 seconds?

4. What power is produced by a horizontal force of 200 N that causes a constant speed of 5 m/s?
What power is produced by a force of 200 N at an angle of 45 degrees to the horizontal that causes a constant speed of 5 m/s?

5. A force of 100 N pulls a 80 N sled at an angle of 40 degrees to the horizontal. If the coefficient of friction is 0.2 between the sled and the surface, how much work does friction perform as the sled moves 10 m? X Y
-Ff
-mg FN
100cos40
100sin40 FN
100N Ff mg

6. X Y
-Ff
-80 FN
76.6
64.3

7. A 100 N horizontal force pulls a 50 N block across a surface that has a coefficient of friction What is the speed of the block after it has moved 20 m if it starts from rest?