12. A force is if the work it does around any closed path is zero.
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- 1. Children in a tree house lift a small dog in a basket 4.70m up to their house. If it takes 201J of work to do this, what is the combined mass of the dog and basket? Explain Draws.1. A 50 kg sled is pushed by applying a force F = 400 N, as shown, with = 30°. The surface is rough with 4 =.4. If the sled is being displaced a distance of 60 m, find the work done on the sled by: a. An applied force F. b. The dissipative force. c. The normal force. d. The weight. F. e. The net force.7. A person pushes a box up an incline with constant force, and after calculating how much work they did on the box summed with how much work gravity did on the box they find a non-zero positive result, i.e. ?person>Wgravity. What are two explanations of where the “extra” work done by the person on the box went?
- Number 1642. A physics student applies a 21.6 N force downward at an angle of 57.2 degrees with the horizontal to displace a broom a distance 6.28 m to sweep up broken lab glass. Determine the work done by the student.A. 73.5 JB. 65.7 JC. 57.8 JD. 78 JQuestion 9 What does it mean when an object has positive work done on it by a force? Energy is flowing out of the object. Energy is flowing into the object. O The object's energy is not changing. Question 10 What does it mean when an object has negative work done on it by a force? The object's energy is not changing. Energy is flowing out of the object. Energy is flowing into of the object.
- % Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m. 5 The work you do is 4 J. 15 True O False O Bi 89 6 X 7 18 ASUS 8 A 19 9 f10 fll f12 pau breA block of mass m = 2.0 kg is pushed a distance d = 4.0 m along a friction surface with coefficient of kinitik friction 0.20, horizontal table by a constant applied force of magnitude F = 25.0 N directed at an angle 0 = 20º below the horizontal as shown in Figure. Determine the work done on the block by: 1. The applied force. 2. The normal force exerted by the table. 3. The gravitational force. 4. The net force on the block. m d11. Can a normal force on an object ever do work on the object? Explain.
- State the condition when the work done by a force is (a) positive (b) negative. Explain with help of examples.4. Identify a case where an object is moving over a surface with friction, but the frictional force does no work.How much work (in Joules) is done by a 32N force acting over a distance of 8m? Assume the force is in the same direction as the displacement.