34 Which of the following is ALWAYS true regarding the law of conservation of energy? a. Potential energy us always conserved Kinetic energy is always conserved. Total energy is always conserved. C. &A soccer ball on a horizontal field rolls, and eventually comes to a stop due to friction. Which of the following statements is true regarding the kinetic energy of the ball? It is converted to thermal energy (heat) It is converted to gravitational potential energy a. It is destroyed d.) It is constant A 3.00 kg toy falls from a height of 1.00 m. What will the kinetic energy of the toy be just before the toy hits the ground? (Assume no air resistance and that g = 9.8 m/s.) 0.98 J c. 29.4 J d. 294 J b. 9.8 J 3. Which of the following is the rate at which energy is transferred? c. mechanical energy potential energy kinetic energy d. power 11. What is the minimum work required to lift a 2.0 kg mass up 5 m? 98 J 196 J a. 7J b. 10 J d. 12. What is the average power supplied by a 60.0 kg person running up a flight of stairs a vertical distance of 4 m in 4.2 s? a. 15. 57 W 6.) 240 W 13. Which of the following is the unit for energy? a. Watts b. Joules c. 560 W d. 670 W c. Tesla d. Newtons 16. What are the units for a spring constant? a. N b. m 14. A force of 20 N compresses a spring a distance of 40 cm. What is the spring constant, k, of the spring? a. 5 N/m C 8 N/m b. 50 N/m d. 80 N/m 15. A cart of mass 100 kg moves with speed 3m/s. What is its kinetic energy? a 150 J c. 450 J b. 300 J d. 900 J atching Nom d. N/m 17. Which of the following refers to the sum of kinetic energy and all forms of potential energy? c. nonmechanical energy a. total energy
Kinematics
A machine is a device that accepts energy in some available form and utilizes it to do a type of work. Energy, work, or power has to be transferred from one mechanical part to another to run a machine. While the transfer of energy between two machine parts, those two parts experience a relative motion with each other. Studying such relative motions is termed kinematics.
Kinetic Energy and Work-Energy Theorem
In physics, work is the product of the net force in direction of the displacement and the magnitude of this displacement or it can also be defined as the energy transfer of an object when it is moved for a distance due to the forces acting on it in the direction of displacement and perpendicular to the displacement which is called the normal force. Energy is the capacity of any object doing work. The SI unit of work is joule and energy is Joule. This principle follows the second law of Newton's law of motion where the net force causes the acceleration of an object. The force of gravity which is downward force and the normal force acting on an object which is perpendicular to the object are equal in magnitude but opposite to the direction, so while determining the net force, these two components cancel out. The net force is the horizontal component of the force and in our explanation, we consider everything as frictionless surface since friction should also be calculated while called the work-energy component of the object. The two most basics of energy classification are potential energy and kinetic energy. There are various kinds of kinetic energy like chemical, mechanical, thermal, nuclear, electrical, radiant energy, and so on. The work is done when there is a change in energy and it mainly depends on the application of force and movement of the object. Let us say how much work is needed to lift a 5kg ball 5m high. Work is mathematically represented as Force ×Displacement. So it will be 5kg times the gravitational constant on earth and the distance moved by the object. Wnet=Fnet times Displacement.
Trending now
This is a popular solution!
Step by step
Solved in 3 steps with 2 images
