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3 years ago

Describe friction force (Ffr) in your own words

1 answer:

3 0

Answer: Friction is like when u take two stick's and rub it together to make fire when you use friction it can produce heat. Applied force is like and applied to an object or person if a person is pushing a desk across the room then there is applied force.

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Magnetic force... Is it a Conservative or Non-conservative field?

solniwko [45]

The correct answer is non-conservative

This is bewildering to people, however, since it shows that it has many aspects of a conservative fields, but is technically not one.

4 0

3 years ago

You have a grindstone (a disk) that is 90.0 kg, has a 0.340-m radius, and is turning at 90.0 rpm, and you press a steel axe agai

QveST [7]

Answer:

Explanation:

Given mass of grindstone $m=90\ kg$

radius of stone $r=0.34\ m$

angular speed of disc $\omega =90\ rpm$

Steel Axle applying a force of $F=20\ N$

coefficient of kinetic friction $\mu =0.2$

Frictional Torque applied by steel is given by

$\tau=r\times f_r$

$\tau =r\times \mu F$

where $f_r$ =frictional force

$\tau =r\times \mu \times F$

$\tau =0.34\times 0.2\times 20$

$\tau =1.36\ N-m$

Torque is also given by

$\tau =I\cdot \alpha$

where $\alpha$ =angular acceleration

I=moment of Inertia

$\tau =0.5Mr^2\times \alpha$

$0.5Mr^2\times \alpha =1.36\ N-m$

$0.5\times 90\times 0.34^2\times \alpha =1.36$

$\alpha =0.261\ rad/s^2$

3 0

4 years ago

How can resistance be useful and where can they be useful?

sergiy2304 [10]

-- Resistance can be useful among the population of a repressive government.
Although it can be dangerous for those who resist, it can also exert pressure
against the regime to alter its repressive practices.

-- Resistance can also be useful in electronic circuits. "Lumped" components with
known numerical values of resistance are used to divide voltage, limit current, and
dissipate controlled amounts of electrical energy.

3 0

3 years ago

A. Usually friction slows things down. Can you imagine a scenario where it speeds things up? Describe

son4ous [18]

Answer:

For example, when a person walk

Explanation:

The force of friction is a resistive force that opposes the motion of objects. It is produced by the contact between two surfaces: since the surfaces are not perfectly smooth, there are "microbumps" that cause a resistive force in the relative motion of the two surface.

This force is evident, for example, when we try to push a crate along the floor: as we push forward, there is a resistive force acting in the opposite direction, and this force is the force of friction.

The force of friction is in the direction opposite to the motion of the object, so in general it tends to slow down the motion of the object over the surface.

However, there is a particular case in which instead friction helps in accelerating the object.

This scenario is when a person walks: in fact, the foot of the person pushes against the floor (backward), and as a result, the floor "pushes" forward with the force of friction, which helps therefore the person to move forward. In fact, the force of friction is the force that allows us to walk forward: without the force of friction, we could not walk (think about how difficult it is to walk over an icy surface: this is because the force of friction on an icy surface is almost zero!)

3 0

3 years ago

The specific heat of silver is 0.057 calories/gram°C. If 10.0 grams of silver were heated and the temperature of the sample chan

vladimir2022 [97]

The formula used for this is:
Q = mcΔT

Where m is the mass, c is the specific heat capacity and ΔT is the change in temperature. Thus:

Q = 10 x 0.057 x 20
Q = 11.4 calories

8 0

4 years ago