ROTATIONAL MOTION

What is the expression for the principle of moments in a lever?

• F1 + F2 = R
• d1 + d2 = L
• F1/F2 = d1/d2
• d1F1 = d2F2

What condition must be satisfied for rotational equilibrium in a lever?

• Forces must be equal
• Distances must be equal
• Sum of forces must be zero
• Sum of clockwise moments equals sum of anticlockwise moments

In a lever, what is the point about which rotation occurs called?

• Load arm
• Effort arm
• Mechanical point
• Fulcrum

Which of the following statements is true about the moment of a couple?

• It depends on the position of the origin
• It changes with the direction of rotation
• It is zero at the center of mass
• It is independent of the origin

What is the formula for the moment of a couple?

• r1 × F
• r2 × (-F)
• (r1 + r2) × F
• AB × F