Show work please Physics 101 LABORATORY XPERIMEN Chapter FRI

Physics 101 LABORATORY XPERIMEN Chapter FRICTION Nam Date: Partner(s) NOTE: The student groups are responsible for cleaning the area where you performed your In addition, all equipment must be returned to their proper locations where they were obtained. EQUIPMENT: Experiment Kits ME 1 and ME 3/4 RO URE 1. Place the unlined side of the friction block on the table and insert the support clip on the bore on one Friction Dynamometer Block front side. 2. Hook the dynamometer (spring scale) onto the support clip. IMAMI 3. Pull the friction block and observe the dynamometer. 4. Record the value of the force in the Data Table 1 for Sliding Friction as measured by the dynamometer at Figure 1 which the friction block moves smoothly. 5. Place the three steel rods next to each other with the Friction Dynamometer distance between them approximately 5 mm (h cm). 6. Place the friction block on the steel rods. 7. Pull the friction block and observe. IMAMI 8. Record the value of the force in the Data Table 1 (Rolling Friction) as measured by the dynamometer. Figure 2 Data Table 1 Type of Friction sliding (fs) Rolling (fR) Friction Force (N)

Solution

9. Static friction isalways greater than rolling friction. Hence

f_s > f_R

10.

Sliding friction and rolling friction are both types of resistive forces that oppose an object’s motion along a surface. The main difference between sliding and rolling friction is that the sliding friction occurs when one surface is rubbing against another surface, whereas rolling friction occurs when an object is rolling on another surface.

Sliding friction (kinetic friction) is the force of friction between two surfaces which are rubbing against each other. Sliding friction is a consequence of having small protrusions on a surface. Whenever the two surfaces are moving against each other, the protrusions interlock and work needs to be done to keep the objects in motion.

Rolling friction occurs when the surface of one body is rolling against the surface of another body. The origin of this force is the deformations that occur on the surfaces as rolling occurs.

11. Technical application of rolling friction

Vehicles:

A lot of factors will impact the amount of rolling friction that occurs with a moving vehicle. The size, weight, shape, and surface area of the wheels will all play a part, as well as the surface and the path the road or track takes. An eighteen-wheeler carrying a heavy load will have greater rolling friction than a compact car, for example, and a train going around a curved track will have greater rolling friction than a train that is traveling on a straight track.

3. Toys

Skateboards, roller skates, and in-line skates all experience rolling friction when they\'re in use, but the degrees of friction they experience are different due to their size, shape, wheel alignment, and weight distribution. A skateboard supports the body weight of its human rider on four wheels instead of rollers skates\' eight wheels, so it will experience greater rolling friction and come to a stop sooner than if its rider-the same person-was moving on roller skates. Roller skates will experience greater rolling friction than in-line skates, though, due to the wheel placement and the fact that the roller skates have a greater surface are coming in contact with the road.

12. There are hundreds of moving parts whirring away in your car\'s engine and gearbox. Every one of these things rubs against something else as it moves—making noise, losing energy to friction, and gradually wearing out. The way to reduce friction between two moving parts is to lubricate them (coat them in oil)—but how does lubrication actually work?

Solids are materials that have a built-in resistance to changing shape, whereas liquids can flow. Think of the difference between ice (which just sits there in a lump) and water (which flows easily as you pour it). If you put a liquid like oil between two solid gears, it will shift about and change its shape as much as it needs to, cushioning the microscopic bumps between the gears as they mesh together and reducing the friction between them.

1. Sliding frictional force depends on normal force and combination of friction surface and contact surface. It is independent of contact area.