Pseudo force pdf

Extra point: Frame of reference : If we are observing any moving body or anybody at rest with respect to any moving object or from any object at rest then the object is called frame of reference. There are two types of frame of reference : Inertial frame of reference : The frame of reference having zero acceleration is called Inertial frame of reference.

This frame of reference will be either in rest or will be moving with a constant velocity. Non-inertial frame of reference : The frame of reference having non-zero acceleration is called the non-inertial frame of reference. For example : If we are observing an object from a freely falling object then this will be a non-inertial frame of reference because the freely falling body has some acceleration. The below table shows the difference between real and pseudo force Real Force Pseudo force i.

A real force. Example: The earth revolves around the sun in circular path due to the gravitational force of attraction between the sun and the earth. Get Started for Free Download App. Concept : Pseudo force: It is a fictitious force and acts opposite to the direction of motion with the same acceleration. Calculation: Given: A thief stole a box full of jewelry of W kg and while carrying it on his head jumped down from third storey of the building This can be solved through the Non-Inertial Frame using Pseudo Force.

The reference frame is in motion or under constant acceleration. CONCEPT: Acceleration due to gravity g : The acceleration by which the earth attracts the body by virtue of its gravity is called acceleration due to gravity. Force of gravity: The gravitational force acting on a body is measured as the product of mass and acceleration due to gravity. In normal situations, the weight of an object is equal to this force of gravity.

Pseudo Force : The force exerted by a body when it is in non - inertial frame is called pseudo force. The direction of this force is opposite to the direction of acceleration of the frame. Important Points If the lift is in upward motion the net weight increases and when in downward motion net weight decreases. Answer Detailed Solution Below Option 4 : zero.

This is the net weight or apparent weight due to this upward or downward acceleration can be given as below. Hence option 4 is correct among all. Increase Decrease Remains same None of the above.

Concept: Apparent weight of a person inside a lift i When the lift moves upward with acceleration a. Hence the effective weight of man will increase when the lift was decelerating while descending below. In which situation he finds his weight less than actual when: The elevator moves upward with constant acceleration The elevator moves downward with constant acceleration The elevator moves upward with uniform velocity The elevator moves downward with uniform velocity.

Exam Preparation Simplified Learn, practice, analyse and improve. Testbook Edu Solutions Pvt. Our Apps. The reference frame is in rest or under constant velocity.

Apparent Weight W app. Result net weight. Lift move with constant Velocity. When lift falls freely under gravity i. Now you may read it with a cup of tea! Observer B is in an elevator. The elevator is moving upwards with an acceleration a. A box of mass M is resting on the elevator floor.

Observer A is stationary and standing on a static surface say ground and watching the box on the elevator floor. Both observer B and the box are moving upwards with an acceleration a. So the observer A who is on the inertial frame of reference will draw the Free Body Diagram FBD of the box on the elevator floor in this way:.

The gravitational pull on the box is mg. Observer A will observe the box in the elevator to move upwards with an acceleration a. Now we take observer B, who is traveling with the box in the same elevator.

As both observer B and the box are within the same elevator frame of reference, observer B will find the box to be static. So for observer B, the acceleration of the box equals zero. Now observer B will draw the FBD of the box in the following way:. We know why. Observer A watches the motion of the box from an inertial frame of reference.

On the contrary observer B watches the box being a part of an accelerating or non-inertial frame of reference. Then what to do for the non-inertial frame of reference while solving numerical?

Yes, you are right. We have to incorporate the concept of Pseudo force.