JEE · Physics · Kinematics doubts

8 doubts found

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What does “Instantaneous velocity” actually mean in Kinematics, and why does it matter for JEE?

the velocity at a single instant — the slope of the position–time graph at that point.

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JEEPhysicsmedium

I keep getting “Instantaneous velocity” questions wrong in Kinematics. What's the trap?

confusing average velocity (total displacement/total time) with instantaneous velocity.

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What does “Acceleration” actually mean in Kinematics, and why does it matter for JEE?

the rate of change of velocity; it is a vector, so direction matters.

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JEEPhysicsmedium

I keep getting “Acceleration” questions wrong in Kinematics. What's the trap?

assuming acceleration is zero whenever velocity is zero (e.g. at the top of a throw, v=0 but a=−g).

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What does “Equations of motion” actually mean in Kinematics, and why does it matter for JEE?

the v=u+at family that connects u, v, a, s and t — valid only for constant acceleration.

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JEEPhysicsmedium

I keep getting “Equations of motion” questions wrong in Kinematics. What's the trap?

using them when acceleration is changing.

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What does “Projectile motion” actually mean in Kinematics, and why does it matter for JEE?

motion under gravity where horizontal and vertical motions are independent — horizontal a=0, vertical a=−g.

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JEEPhysicsmedium

I keep getting “Projectile motion” questions wrong in Kinematics. What's the trap?

applying v=u+at to the whole velocity instead of resolving into x and y components.

KinematicsRead →