ROTATIONAL MOTION

What is the primary purpose of a lever as described in the text?

• To generate electricity
• To store energy
• To measure time
• To balance forces using the principle of moments

How is the mechanical advantage related to arm lengths?

• M.A. = d1/d2
• M.A. = d1 + d2
• M.A. = d1 × d2
• M.A. = effort arm / load arm

What is the torque when force is applied at the fulcrum?

• F
• F × d
• Infinite
• Zero

In a balance beam, what is adjusted to achieve equilibrium?

• Length of beam
• Color of weights
• Temperature
• Position of weights

What is the significance of the cross product in torque calculation?

• It adds the vectors
• It finds average
• It reduces error
• It gives the magnitude and direction of torque