Read through chapter 7 to page 127 (the section on stability) do you have any questions?
The unit of mass is kg, the unit of moment of inertia is
What other differences do you see between the units of the rotational moment side and the linear motion side?
Three trucks have equal mass and are parked along an incline. while the mass is equal, they are arranged differently and have different center of mass, as shown by the smily face. Will any of the trucks tip over? Explain why (this is more of a gut feeling question than anything else, you can read in the book to explain though.)
Predictions: if you were to attempt to balance a hammer (upright on the palm of your hand, upside-down on the palm of your hand, upright on the tip of your finger, upside-down on the tip of your finger, which way would you guess will be easier, which would be hardest?
Go find a hammer. Guesstimate where you think the center of mass of your hammer is. You are going to attempt to balance the hammer in four ways. make observations of how easy or difficult it is to balance the hammer each way.
Honors: see if you can explain stability in terms of torque.
place a ruler (stick, book, pencil, etc) on a table just like in this example. if you let it go, observe where the axis of rotation will be.
A 2kg mass at the end of a 1m long string (of negligible mass) is swung counterclockwise around at a constant 5 rotations per minute. The moment of inertia used the equation
What is the moment of inertia of the ball? include units.
The equation for angular momentum is
What is the angular momentum of the ball in the question above? include units.
The bolt is stuck, and I am trying to use a wrench to turn it. I jump on the wrench. Do I create a larger torque in figure A or figure B?
Assume the wrench requires 10NM of torque to turn. If the wrench is 0.5 meters long, how much force do you need to use to turn the bolt? Use the equation
HONORS - How much work is done to turn the wrench a quarter of a revolution?
I have to turn a bolt and the wrench is stuck. Explain why the man is going to have a harder time turning the bolt than the woman. Assume the man and the woman have the same mass.
can you open a door by applying a force parallel to the door? Go try it. what happens?
Someone opens a door with a force that is neither parallel nor perpendicular to the door. Decompose the vectors of that force. Circle the decomposed vectors will create the torque needed to close the door. HONORS: using trig (pick sine or cosine) determine how much of the 60 N of force is creating torque and figure out how much torque it creates.
using this list of equations, consider the idea of a ball being swung from a string at a constant speed. Which of the following are true, check all that apply.
If the beam is not moving, the net force on the beam is
If the beam is not moving, the net TORQUE on the beam is
Two other forces are on the beam, the force of the bolt, and the normal force from the block. in what direction would the normal force be?
Two other forces are on the beam, the force of the bolt, and the normal force from the block. in what direction would the force of the bolt be??
The force of the man standing at the end of the beam creates a torque on the beam. you can measure that torque using
which of the following is the torque of the man?
