Ask question

Ask question

All categories

3 years ago

10

All of the following show friction as a useful force, except

1 answer:

Troyanec [42]3 years ago

3 0

having to push a rough and heavy box across the floor to move it

Explanation:

Friction is not a useful force because we have to exert even more force to push a body that is rough and heavy across the floor to move it.

Frictional force is a force that opposes the motion of a body.
It costs more and uses more energy to push a rough and heavy box on surface because of friction.
This wastes energy in systems that deals with pushing.

Friction is useful in that:

the heat energy produced when two surfaces rub together is very useful.
the friction between your feet and the floor keeping you from slipping and makes walking possible.
the tread on tires helping the moving vehicle slow down and stop when necessary.

learn more:

Friction brainly.com/question/7174363

#learnwithBrainly

You might be interested in

Three objects lie in the x, y plane. Each rotates about the z axis with an angular speed of 5.58 rad/s. The mass m of each objec

QveST [7]

Answer:

a) V1=11.05m/s V2=92.07m/s V3=17.24m/s

b) KE = 16238.26J

Explanation:

For tangential speeds:

$V1 = \omega*R1=5.58*1.98=11.05m/s$

$V2 = \omega*R2=5.58*16.5=92.07m/s$

$V3 = \omega*R3=5.58*3.09=17.24m/s$

For the kinetic energy, it can be calculated as:

$KE=1/2*\omega^2*(I1+I2+I3)$

Where:

$I1 = m1*R1^2=5.46*1.98^2=21.4kg.m^2$

$I2 = m2*R2^2=3.64*16.5^2=990.99kg.m^2$

$I3 = m3*R3^2=3.21*3.09^2=30.65kg.m^2$

So,

$KE=1/2*5.58^2*(21.4+990.99+30.65)$

KE=16238.26J

4 0

3 years ago

The main benefit you receive from using locomotor movements in a variety of activities is? Question 3 options:

Helga [31]

Answer:

run walk jump digk pwss botch

Explanation:

fudge

4 0

3 years ago

Read 2 more answers

if Gabriel kicks the football 50 meters to the west in 3 seconds , what is the velocity of the football?

Svet_ta [14]

Answer:

velocity = 16.67[m/s]

Explanation:

To solve this problem we must use the following expression of speed, where we see the relationship between displacement and time.

velocity = displacement/time [m/s]

displacement = 50 [m]

time = 3 [s]

velocity = 50/3

velocity = 16.67[m/s]

8 0

3 years ago

Two mugs of tea were made and their temperatures measured. Which statement correctly describes the characteristics of the partic

Cerrena [4.2K]

Answer:

Its b on ed-genuity- The particles in mug A are moving more slowly.

6 0

4 years ago

Read 2 more answers

An assistant for a football team carries a 26.0 kg cooler of water from the top row of the stadium, which is a distance h = 17.5

frozen [14]

The weight of the cooler is (mg). That's (26)(9.8) = 254.8 Newtons.

Its gravitational potential energy while it's up in the top row is (mgh). That's (254.8)(17.5) = 4,459 Joules.

That's how much work it took to get the cooler up to the top row, and that's the energy it gives up when it moves back down to the bench.

In order to bring it down . . .

-- Gravity does 4,459 joules of work on the cooler.

-- The team assistant does NEGATIVE 4,459 joules of work on it.

6 0

3 years ago