Motion and forces (Ch 10 and 11)
... motion Extending the time needed to change the momentum lessens the force For example, moving in the direction of the motion after landing a pole-vault, high-jump, or gymnastics trick, extends the time of the momentum change, which results in the impact force decreasing. ...
... motion Extending the time needed to change the momentum lessens the force For example, moving in the direction of the motion after landing a pole-vault, high-jump, or gymnastics trick, extends the time of the momentum change, which results in the impact force decreasing. ...
Slides - Nuffield Foundation
... • When can you use F = mR? • How does the friction model allow you to use F = ma and the constant acceleration equations to solve problems? • Can you think of other situations when friction prevents an object from moving? • Can you think of other situations when friction causes an object to accelera ...
... • When can you use F = mR? • How does the friction model allow you to use F = ma and the constant acceleration equations to solve problems? • Can you think of other situations when friction prevents an object from moving? • Can you think of other situations when friction causes an object to accelera ...
Newton`s 2nd Law
... Suppose that the man is twice as heavy as the woman and that their same-size chutes are initially opened. The same-size chute means that at equal speeds the air resistance is the same on each. Who gets to the ground first—the heavy man or the lighter woman? The answer is the person who falls fastest ...
... Suppose that the man is twice as heavy as the woman and that their same-size chutes are initially opened. The same-size chute means that at equal speeds the air resistance is the same on each. Who gets to the ground first—the heavy man or the lighter woman? The answer is the person who falls fastest ...
Friction notes
... contact with each other. For most surface combinations, the friction coefficients show little dependence upon other variables such as area of contact, temperature, etc. Values of μkinetic have been experimentally determined for a variety of surface combinations and are often tabulated in technical m ...
... contact with each other. For most surface combinations, the friction coefficients show little dependence upon other variables such as area of contact, temperature, etc. Values of μkinetic have been experimentally determined for a variety of surface combinations and are often tabulated in technical m ...
Biomedical Instrumentation Tara Alvarez Ph.D.
... minimum to maximum. Ie if your instrument can measure from -10V to +10 V your dynamic range is 20V Precision = Degree of reproducibility denoted as the range of one standard deviation σ Resolution = smallest detectable incremental change of input parameter that can be ...
... minimum to maximum. Ie if your instrument can measure from -10V to +10 V your dynamic range is 20V Precision = Degree of reproducibility denoted as the range of one standard deviation σ Resolution = smallest detectable incremental change of input parameter that can be ...
Aim: How do we explain Newton`s 3rd Law?
... 3. A traveler pulls a suitcase of mass 8.00 kg across a level surface by pulling on the handle 20.0 N at an angle of 50.0° relative to horizontal. Friction against the suitcase can be modeled by μk = 0.100. (a) Determine the acceleration of the suitcase. (b) What amount of force applied at the same ...
... 3. A traveler pulls a suitcase of mass 8.00 kg across a level surface by pulling on the handle 20.0 N at an angle of 50.0° relative to horizontal. Friction against the suitcase can be modeled by μk = 0.100. (a) Determine the acceleration of the suitcase. (b) What amount of force applied at the same ...
Closer look at friction notes
... EX: A 800 kg car, moving at 72 km/hr, slams on the brakes, locking the wheels. The rubber tires skid on the concrete road, producing a frictional force. Find the distance required by the car to stop. Use the coefficient of friction from the sample coefficients ...
... EX: A 800 kg car, moving at 72 km/hr, slams on the brakes, locking the wheels. The rubber tires skid on the concrete road, producing a frictional force. Find the distance required by the car to stop. Use the coefficient of friction from the sample coefficients ...
Free Body Diagrams
... pulls a 52N sled across a cement sidewalk at a constant speed. What is the coefficient of friction between the sidewalk and the sled (ignoring air resistance)? 36N ...
... pulls a 52N sled across a cement sidewalk at a constant speed. What is the coefficient of friction between the sidewalk and the sled (ignoring air resistance)? 36N ...
Calculating Net Force with the Second Law
... • The force that slows the skateboard and brings it to a stop is friction. • Friction is the force that opposes the sliding motion of two surfaces that are touching each other. • The amount of friction between two surfaces depends on two factorsthe kinds of surfaces and the force pressing the surfa ...
... • The force that slows the skateboard and brings it to a stop is friction. • Friction is the force that opposes the sliding motion of two surfaces that are touching each other. • The amount of friction between two surfaces depends on two factorsthe kinds of surfaces and the force pressing the surfa ...
Lab 7: Friction Multi-blocks
... 4. If you push on a heavy box that is at rest, you must exert some force to start its motion. 5. However, once the box is in motion you need a smaller force to maintain that motion. Why? 6. Find the force needed to pull a mass of 30 kg at constant velocity on a rough incline making an angle of 400 w ...
... 4. If you push on a heavy box that is at rest, you must exert some force to start its motion. 5. However, once the box is in motion you need a smaller force to maintain that motion. Why? 6. Find the force needed to pull a mass of 30 kg at constant velocity on a rough incline making an angle of 400 w ...
Friction Lab - Oakland Schools Moodle
... There are a few ways to measure the coefficient of friction. First, you must know the definition of the coefficient. It is the ratio of the force of friction between two objects that are in contact and the normal force. Therefore, you must figure out a way to measure those two variables, and then ca ...
... There are a few ways to measure the coefficient of friction. First, you must know the definition of the coefficient. It is the ratio of the force of friction between two objects that are in contact and the normal force. Therefore, you must figure out a way to measure those two variables, and then ca ...
Forces - Faculty Perry, Oklahoma
... The strength of a force is measured in newtons (n). One newton (1 n) is the roughly amount of force used to pick up an apple off the floor. ...
... The strength of a force is measured in newtons (n). One newton (1 n) is the roughly amount of force used to pick up an apple off the floor. ...
Forces on wheels and fuel consumption in cars
... means of a drive shaft (the gearbox function does not need to be considered in our discussion that is about physics and not about mechanical engineering). Each wheel drive is acted by a torque M0 /2. The front wheels are also acted upon by other forces that the rest of the car exerts on them, simila ...
... means of a drive shaft (the gearbox function does not need to be considered in our discussion that is about physics and not about mechanical engineering). Each wheel drive is acted by a torque M0 /2. The front wheels are also acted upon by other forces that the rest of the car exerts on them, simila ...
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.