. Review the concept of work. Suppose an object is under the action of a constant force. Make sketches (using arrows) showing the relative directions of the force and object’s displacement when the work done by the force is: positive, negative, zero. 2. Suppose an object travels from point A to point B. Suppose also that two constant opposite forces F1 and F2 act on the object. When might the net work done on the object be positive, negative, zero? Illustrate your answers.

. Review the concept of work. Suppose an object is under the action of a constant force. Make sketches (using arrows) showing the relative directions of the force and object’s displacement when the work done by the force is: positive, negative, zero. 2. Suppose an object travels from point A to point B. Suppose also that two constant opposite forces F1 and F2 act on the object. When might the net work done on the object be positive, negative, zero? Illustrate your answers.

Similar questions

Computation. A force F(x) = bx³ acts on a potato as it moves along the x-axis from the origin to 4.1 m. How much work is done by the force on the potato if b = 4.29 N/m³ ? W = _____ J Record your numerical answer below assuming three significant figures. Remember to include a "-" if necessary. LOCO 10:52 PM 10/23/2022 2
2. A force acting on an object moving along the x axis is given by Fx=(14x- 3.0x) N where x is in m. How much work is done by this force as the object moves from x =-1m to x +2 m? %3D
505
32
How do you know if the work done by a force acting on an object is positive or negative? Hint: Work is a scalar but both force and displacement are vectors.
7. A 1650 kg car accelerates up a hill by applying a force of 4.61 × 10³ N parallel to the hill. The hill is at an incline of 13°. m 2016 d = 17 m 13° A. What is the net work done on the car as it travels 17 m up the hill? (Hint: calculate the work done by each force in the system. There are 3 forces. The net work is the sum of the works done by each individual force.) b. What is the change in kinetic energy for the car? at the bottom of the hill. How fast is it moving at the top The car is travelling at a speed of 16 of the hill? I= c) 74°F
5. Mark and David are loading identical cement blocks onto David's pickup truck. Mark lifts his block straight up from the ground to the truck, whereas David slides his block up a ramp on massless, frictionless rollers. Which statement is true? A. Mark does more work than David B. Mark and David do the same amount of work C. David does more work than Mark D. None of these statements is neces sarily true because the angle of the incline is unknown E. None of these statements is neces sarily true because the mass of one block is not given 6. A worker pushes a wheelbarrow 5.0 m along a level surface, exerting a constant horizontal force of 50.0 N. If a frictional force of 43 N acts on the wheelbarrow in a direction opposite to that of the worker, what net work is done on the wheelbarrow? A. 250 J B. 215 J C. 35 J D. 15 J E. 45 J 7. An athlete jumping vertically on a trampoline leaves the surface with a velocity of 8.5 m/s upward. What maximum height does she reach?A. 13 m B. 2.3 m C. 3.7…
1. A constant 15 N horizontal force is applied to a 15 kg cart at rest on a level floor. If friction is negligible, what is the speed of the cart after it has gone 8.0 m? Think and Prepare 1. You are going to use the Work-Energy Theorem for this problem 2. How will you figure out the change in KE of the cart? 3. How will you figure out the work done by the force? Enter to 2 significant figures Speed after 8 m = m/s
Two persons weigh same and climb the same flight of stairs. Person 1 takes 3 sec and person 2 takes 5 sec. Choose all that apply. A. Person 1 has more power. B. Person 2 has more power. C. Person 2 does more amount of work. D. Both persons do the same amount of work.