04d - Torque Introduction

A state of equilibrium is also seen below. Each of the cars weighs the same  9800 N. Despite the fact that there is only one car on the left-hand side that is 9 m from the fulcrum, the torques balance because, the car on the left-hand side, is ____meters from the fulcrum, compared to the cars on the right-hand side.

• 4.5 m
• 3 m
• 1 m
• 2 m

Does a bridge anchored resting on two pillars have any torque?

• No, it isn't moving
• Yes, but it is at equilibrium
• Yes, but it will soon break because of the torque
• No, Bridges can't have torque

The figure above shows a uniform meterstick that is set on a fulcrum at its center. A force of magnitude F toward the bottom of the page is exerted on the meterstick at the position shown. At which of the labeled positions must an upward force of magnitude 2F be exerted on the meterstick to keep the meterstick in equilibrium?

• A

• B

• C

• D

Tags

NGSS.HS-PS2-1

What happens to her angular velocity when a figure skater brings in her arms?

• Increases her angular velocity
• Decreases her angular velocity
• Has no affect

Which would have a greater linear velocity?

• Kid near the center of the merry go round
• Kid near the outside of the merry go round
• neither

Why are you more stable when riding a bicycle at a faster speed?

• You have more mass
• The wheels have angular momentum
• It's not easier to ride at a faster speed
• The bike has more momentum

Tags

NGSS.MS-PS3-1

What does the rotational inertia describe? 

• The average position of mass in an extended object.
• How the mass of an object is distributed 
• How a force can rotate an object.
• The tendency of an object to move in a straight line.

In order to do a lot of flips an Olympic diver would want:

• A high rotational inertia
• A low rotational inertia
• A low linear acceleration
• A low angular velocity

A disc rotates through 20 rotations in 5 seconds. If the disc starts from rest, what is the angular velocity?

• 5 rotations/s
• 100 rotations/s
• 4 rotations/s
• 10 rotations/s

A possible unit for angular acceleration is:

• rad/s^2
• rad/s
• N*m
• Kg*m^2