Can an object be in free fall if it is moving upward?
When the object is thrown upward(that motion isn’t free because at that time our applied force is also acting on the object), it reaches a maximum height and fall back to the ground. While falling back to the ground,only gravity is acting on the object. It is not free fall while going up.
Is the statement an object always moves in the direction?
An object anywhere always moves in the direction of the net force applied to that object. More precisely, that applies to objects that were not moving in the first place. For a moving object, you combine the acceleration in the direction of the net force with the current motion.
How does gravity affect objects that are moving horizontally?
This downward force and acceleration results in a downward displacement from the position that the object would be if there were no gravity. The force of gravity does not affect the horizontal component of motion; a projectile maintains a constant horizontal velocity since there are no horizontal forces acting upon it.
Can work be done horizontally?
Horizontal forces affect horizontal motion. Work is done whenever a force or a component of a force results in a displacement. No component of the force is acting in the direction of motion when the book is moved horizontally with a constant velocity. The force and the displacement are independent.
What is transferred when work is done?
Work is the measure of energy transfer when a force (F) moves an object through a distance (d). So when work is done, energy has been transferred from one energy store to another, and so: energy transferred = work done. Energy transferred and work done are both measured in joules (J).
What is the work done when a body is moved horizontally along a frictionless surface?
Q8. What is the work done against gravity when a body is moved horizontally along a frictionless surface? Answer: The work done against the gravity when a body is move horizontally along a frictionless surface is zero as the force of gravity acts perpendicular to the direction of motion.
What is work done on a body moving in a circular path?
The work done on a body moving in a circular path is also zero. This is because, when a body moves in a circular path, then the centripetal force acts along the radius of the circle, and it is at right angles to the motion of the body. Thus, the work done in the case of moon moving round the earth is also zero.
What is work against gravity?
Work done against the gravity: Work done by a body is against the applied force if the displacement is in a direction opposite to the force. Work done against gravity = Force x Displacement = Weight x Height = mgh = gravitational potential energy stored in the body.
What is the amount of work done by the gravitational force on the body moving on the horizontal plane?
As the gravitational force is perpendicular to the distance moved by body, so the work done by gravity will be zero.
What happens to the body on which work is done?
Work done on a body is equal to the increase in the energy of the body, for work transfers energy to the body. If, however, the applied force is opposite to the motion of the object, the work is considered to be negative, implying that energy is taken from the object.
When we can say work is done?
Work is done whenever the given conditions are satisfied: A force acts on the body. There is a displacement of the body caused by the applied force along the direction of the applied force. The work W is equal to the force f times the distance d, or W = fd.
What is positive and negative work done?
We saw that when the force and displacement are in the same direction, we call the work as positive. In the opposite direction, we call the work as negative.
What is positive work done with example?
Positive work: when force and displacement are in the same direction, the work performed on an object is said to be positive work. Example: When a body moves on the horizontal surface, force and displacement act in the forward path. The work is done in this case known as Positive work.
Why work done on the system is negative?
Work and Chemical Reactions The negative sign associated with PV work done indicates that the system loses energy. If the volume increases at constant pressure (ΔV > 0), the work done by the system is negative, indicating that a system has lost energy by performing work on its surroundings.
What does it mean when work is 0?
Work done is zero when the force is perpendicular to the displacement. It can also be zero if either the force or the displacement are zero.
In which situation is no work done?
If a force is applied but the object doesn’t move, no work is done; if a force is applied and the object moves a distance d in a direction other than the direction of the force, less work is done than if the object moves a distance d in the direction of the applied force.
In which case is no work done?
Let us consider some cases where work is not done: Work is zero if applied force is zero (W=0 if F=0): If a block is moving on a smooth horizontal surface (frictionless), no work will be done. Note that the block may have large displacement but no work gets done. Work is zero if Cos θ is zero or θ = Π/2.
In which process work done is zero?
In which process work done is maximum?
In isothermal and reversible process, maximum work is said to have done. In reversible process , system would return from initial to the final state in infinite number of steps.
What is Isochoric process?
An Isochoric process, also called a constant-volume process, an isovolumetric process, or an isometric process, is a thermodynamic process during which the volume of the closed system undergoing such a process remains constant.