Untitled Flashcards Set

Flashcard 1
Q: What is Translational Motion?
A: - Movement where all parts of a body move the same distance in a given time.

Flashcard 2
Q: What is Rotational Motion?
A: - Movement around a fixed axis where different parts move through different distances in a given time.

Flashcard 3
Q: What is the Moment of a Force?
A: - Rotational effect produced by a force acting on a body.

Formula: M = F × d (Force × Perpendicular distance from the pivot).
SI Unit: Newton-meter (Nm).
cgs Unit: Dyne-centimeter (dyne cm).
Examples: Opening a door, turning a steering wheel.

Flashcard 4
Q: What is a Clockwise Moment?
A: - Rotation caused by a force in the clockwise direction.

Flashcard 5
Q: What is an Anticlockwise Moment?
A: - Rotation caused by a force in the counterclockwise direction.

Flashcard 6
Q: What is Translational Equilibrium?
A: - When the net force acting on a body is zero.

Flashcard 7
Q: What is Rotational Equilibrium?
A: - When the sum of clockwise moments equals the sum of anticlockwise moments.

Flashcard 8
Q: State the Principle of Moments.
A: - For a body to be in rotational equilibrium, the sum of clockwise moments about a pivot must equal the sum of anticlockwise moments.

Flashcard 9
Q: How is the Principle of Moments verified?
A: - Using a meter rule suspended by two spring balances with slotted weights hanging from it.

Flashcard 10
Q: What is the Centre of Gravity?
A: - The point where the entire weight of a body acts, irrespective of the orientation.

Examples:
- Sphere → Center
- Cylinder → Center of axis
- Rectangle → Intersection of diagonals
- Irregular Lamina → Plumb line method

Flashcard 11
Q: What is Uniform Circular Motion?
A: - Motion of an object at a constant speed on a circular path.

Flashcard 12
Q: What are the characteristics of Uniform Circular Motion?
A: - Constant speed

Centripetal acceleration (toward the center)

Flashcard 13
Q: What is Centripetal Force?
A: - Force acting towards the center of the circular path.

Flashcard 14
Q: What is Centrifugal Force?
A: - Apparent force felt by an object moving in a circular path, acting outward from the center.

Flashcard 15
Q: Calculate the moment of a 10 N force acting perpendicular to a door at a distance of 0.5 m from the hinge.
A: - M = F × d

M = 10 N × 0.5 m
M = 5 Nm

Flashcard 16
Q: If weights of 2 N and 3 N are hung at 20 cm and 30 cm respectively from the pivot, what distance must a 6 N weight be hung to balance them?
A: - Sum of clockwise moments = Sum of anticlockwise moments

(2 N × 20 cm) + (3 N × 30 cm) = 6 N × distance
40 Ncm + 90 Ncm = 6 N × distance
Distance = 130 Ncm ÷ 6 N
Distance = 21.67 cm

Flashcard 17
Q: A car of mass 1500 kg moves at 20 m/s around a circular track of radius 50 m. Calculate the centripetal force.
A: - F = (mass × velocity²) ÷ radius