a). Which of the following is NOT a unit of potential energy: a)J, b) kg*m/s^2, C) kg*m^2/s^2, D) N*m b) A change in kinetic energy is equal to:a) Work d) Speed C) Momentumb) Power e) Impulse Modified True/False – indicate whether the sentence or statement is true or false. If false, change the identified word or phrase to make the sentence or statement true. 13. In an isolated system, momentum is not always conserved during a collision. _______________ 14. The impulse is always in the same direction as the net force. _______________ 15. Kinetic energy is a vector quantity. _______________ 16. The change in gravitational potential energy can never have a negative value. _______________ 17. The maximum work a force can do on an object occurs when the force is parallel to the direction of motion. _______________ 18. Positive work is done when the force and the displacement are in the same directions. _______________ 19. To raise a 2.3 kg mass from its resting place on a table, more work is done by lifting it diagonally than lifting it straight up. _______________ 20. When you triple the velocity of an object of constant mass, you also triple the momentum.
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.
a). Which of the following is NOT a unit of potential energy: a)J, b) kg*m/s^2, C) kg*m^2/s^2, D) N*m
b) A change in kinetic energy is equal to:a) Work d) Speed C) Momentumb) Power e) Impulse
Modified True/False – indicate whether the sentence or statement is true or false. If false, change the
identified word or phrase to make the sentence or statement true.
13. In an isolated system, momentum is not always conserved during a collision. _______________
14. The impulse is always in the same direction as the net force. _______________
15. Kinetic energy is a vector quantity. _______________
16. The change in gravitational potential energy can never have a negative value. _______________
17. The maximum work a force can do on an object occurs when the force is parallel to the direction of
motion. _______________
18. Positive work is done when the force and the displacement are in the same directions. _______________
19. To raise a 2.3 kg mass from its resting place on a table, more work is done by lifting it diagonally than
lifting it straight up. _______________
20. When you triple the velocity of an object of constant mass, you also triple the momentum.
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