Chapter 11
... Rotation of a rigid body about an axis not fixed in space Smooth Rolling: Rolling motion without slipping Motion of com “O” and point “P” When the wheel rotates through angle , P moves through an arc length s given by s=R Differentiating with respect to t We get ds/dt= R d/dt ...
... Rotation of a rigid body about an axis not fixed in space Smooth Rolling: Rolling motion without slipping Motion of com “O” and point “P” When the wheel rotates through angle , P moves through an arc length s given by s=R Differentiating with respect to t We get ds/dt= R d/dt ...
A Mousetrap Powered Racer
... There are two types of friction, surface friction and fluid friction. Surface friction is caused by the rubbing of two surfaces in contact with on another. Where your axle connects to the frame of your vehicle is one place that you will find surface friction on your car. By reducing the surface fric ...
... There are two types of friction, surface friction and fluid friction. Surface friction is caused by the rubbing of two surfaces in contact with on another. Where your axle connects to the frame of your vehicle is one place that you will find surface friction on your car. By reducing the surface fric ...
Lab Writeup Air Resistance
... ground first. Large raindrops fall faster than small raindrops. These effects are due to air resistance. Without air resistance, the objects will all fall with the same acceleration, g, and hit the ground at the same time. Air resistance acts like a frictional force. However, air resistance does not ...
... ground first. Large raindrops fall faster than small raindrops. These effects are due to air resistance. Without air resistance, the objects will all fall with the same acceleration, g, and hit the ground at the same time. Air resistance acts like a frictional force. However, air resistance does not ...
Part VI
... object. This path is called a cycloid • The line shows the path of the center of mass of the object • In pure rolling motion, an object rolls without slipping • In such a case, there is a simple relationship between its rotational and translational motions ...
... object. This path is called a cycloid • The line shows the path of the center of mass of the object • In pure rolling motion, an object rolls without slipping • In such a case, there is a simple relationship between its rotational and translational motions ...
Document
... The parachute is opened and air resistance increases. Upward unbalanced force, so the parachute decelerates and slows down weight Air resistance ...
... The parachute is opened and air resistance increases. Upward unbalanced force, so the parachute decelerates and slows down weight Air resistance ...
Lecture 18
... A bob is hung by a string, attached to a spring scale which is suspended from a stand. First note the reading on the spring scale when the bob is not moving. The bob and string will then be pulled back so that the string makes an angle theta with the vertical. The bob will then be released and allow ...
... A bob is hung by a string, attached to a spring scale which is suspended from a stand. First note the reading on the spring scale when the bob is not moving. The bob and string will then be pulled back so that the string makes an angle theta with the vertical. The bob will then be released and allow ...
Power to weight (specific power)
... Nf is the normal force (equal to W shown in figure 1, not just N shown in figure 1). Equating the above two equations, and solving for b, gives b = Crr·r. Therefore, if a source gives rolling resistance coefficient (Crr) as a dimensionless coefficient, it can be converted to b, having units of lengt ...
... Nf is the normal force (equal to W shown in figure 1, not just N shown in figure 1). Equating the above two equations, and solving for b, gives b = Crr·r. Therefore, if a source gives rolling resistance coefficient (Crr) as a dimensionless coefficient, it can be converted to b, having units of lengt ...
Ch 11 Rolling, Torque and Angular Momentum
... Angular Momentum of a System of Particles Just like we earlier added up the individual momentums of a system of particles, we can do the same for angular momentums. ...
... Angular Momentum of a System of Particles Just like we earlier added up the individual momentums of a system of particles, we can do the same for angular momentums. ...
When an object moves through a fluid, it pushes the molecules of
... When an object moves through a fluid, it pushes the molecules of the fluid out of the way. At the same time, the molecules of the fluid exert an equal and opposite force on the object that slows it down. This force resisting motion through a fluid is a type of friction that is often called drag. Fri ...
... When an object moves through a fluid, it pushes the molecules of the fluid out of the way. At the same time, the molecules of the fluid exert an equal and opposite force on the object that slows it down. This force resisting motion through a fluid is a type of friction that is often called drag. Fri ...
Thursday, Dec. 11th Thursday, Dec. 11th
... Q: How do the avg. speeds of various rolling objects compare over the course of 1 meter? Hypothesis: If… then… because… Procedure: includes 3 variables and ...
... Q: How do the avg. speeds of various rolling objects compare over the course of 1 meter? Hypothesis: If… then… because… Procedure: includes 3 variables and ...
Zero Torque and Static Equilibrium
... Torque equation involves only 1 unknown force F2 Solve for F2 Substitute F2 into the force equation and solve for F1 ...
... Torque equation involves only 1 unknown force F2 Solve for F2 Substitute F2 into the force equation and solve for F1 ...
Rolling resistance
Rolling resistance, sometimes called rolling friction or rolling drag, is the force resisting the motion when a body (such as a ball, tire, or wheel) rolls on a surface. It is mainly caused by non-elastic effects; that is, not all the energy needed for deformation (or movement) of the wheel, roadbed, etc. is recovered when the pressure is removed. Two forms of this are hysteresis losses (see below), and permanent (plastic) deformation of the object or the surface (e.g. soil). Another cause of rolling resistance lies in the slippage between the wheel and the surface, which dissipates energy. Note that only the last of these effects involves friction, therefore the name ""rolling friction"" is to an extent a misnomer.In analogy with sliding friction, rolling resistance is often expressed as a coefficient times the normal force. This coefficient of rolling resistance is generally much smaller than the coefficient of sliding friction.Any coasting wheeled vehicle will gradually slow down due to rolling resistance including that of the bearings, but a train car with steel wheels running on steel rails will roll farther than a bus of the same mass with rubber tires running on tarmac. Factors that contribute to rolling resistance are the (amount of) deformation of the wheels, the deformation of the roadbed surface, and movement below the surface. Additional contributing factors include wheel diameter, speed, load on wheel, surface adhesion, sliding, and relative micro-sliding between the surfaces of contact. The losses due to hysteresis also depend strongly on the material properties of the wheel or tire and the surface. For example, a rubber tire will have higher rolling resistance on a paved road than a steel railroad wheel on a steel rail. Also, sand on the ground will give more rolling resistance than concrete.