The bead slides starting from rest at position C on the frictionless wire. The d

Question

The bead slides starting from rest at position C on the frictionless wire. The direction of the gravitational field is in the -y direction (toward the bottom of the page). Mark each statement as either true, false, greater than, less than, or equal to.

The acceleration in the y-direction at D is ... zero.

The velocity at A equals the velocity at B.

The acceleration at B is zero.

The speed at H is ... the speed at B.

The speed at B is ... the speed at A.

The acceleration in the x-direction at D is ... zero.

NOTE: answers already attempted and wrong

1.

2.

Equal to

3.

Explanation / Answer

1.acceleration due to gravity is always present and along -ve y direction.

greater than

2. using conservation of energy principle,

potential energy at at B+kinetic energy at B=potential energy at A+kinetic energy at A

as A is higher than B, potential energy at A is higher than B (from the figure A looks higher than B, if it is at equal heights, then velocities are equal)

kinetic energy at A is lesser than B
velocity at A is lesser than B

answer: FALSE

Q3. acceleration is in downward direction.

answer: FALSE

Q4. using same reasoning as used in Q2, speed at H is lesser than speed at B.

Q5. speed at B is greater than speed at A.

Q6. equal to

hence final list of answers are:

greater than
FALSE

FALSE
lesser than
greater than
equal to

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