Torque

Mr. Anderson explains torque in rotational motion, using examples like a wrench and a door. Torque is the product of force and lever arm, both perpendicular to the axis of rotation. He demonstrates how torque affects motion and balance, using a seesaw to illustrate balanced systems. The video concludes with a call to design experiments to explore these concepts further.

What type of motion occurs when a force is applied at the center of gravity of an object?

• Translational motion

• Rotational motion

• Vibrational motion

• Oscillatory motion

Which of the following best describes torque?

• The sum of all forces acting on an object

• The speed at which an object rotates

• The difference between two opposing forces

• The product of force and distance from the axis of rotation

What is the unit of torque in the SI system?

• Watt

• Newton

• Joule

• Newton-meter

Why is the doorknob placed far from the hinge?

• To balance the weight of the door

• To increase the torque applied to the door

• To reduce the force needed to open the door

• To make the door more aesthetically pleasing

What happens to the torque if the lever arm is shortened while keeping the force constant?

• Torque increases

• Torque decreases

• Torque remains the same

• Torque becomes zero

In a balanced seesaw, what must be true about the torques on either side?

• They must be unequal

• They must be opposite

• They must be zero

• They must be equal

How can you balance a seesaw with unequal weights on either side?

• By increasing the weight on the lighter side

• By decreasing the weight on the heavier side

• By adjusting the lever arm distance

• By changing the axis of rotation