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kvv77 [185]
3 years ago
15

Give an example of how friction can be used and an example of how friction can be harmful

Physics
2 answers:
andrezito [222]3 years ago
6 0
Friction between the floor and our shoes is useful because it prevents us from slipping but it’s harmful in machines because it causes parts in contact to wear out
DaniilM [7]3 years ago
5 0

Answer:

friction can be used to slow things down but it can also be harmful because it can cause fire to start

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3. Calculate the force it would take to accelerate a 50 ka bike at a rate of 3 m/s2 (6 points)
qwelly [4]

Answer:

150 N

Explanation:

Given that,

  • Acceleration (a) = 3 m/s²
  • Mass of the bike (m) = 50 kg

We are asked to calculate force required.

\longrightarrow F = ma

\longrightarrow F = (50 × 3) N

\longrightarrow <u>F</u><u> </u><u>=</u><u> </u><u>1</u><u>5</u><u>0</u><u> </u><u>N</u>

8 0
2 years ago
A proton with a velocity in the positive x-direction enters a region where there is a uniform magnetic field B in the positive y
Genrish500 [490]

Answer:

Positive z direction.

Explanation:

The magnetic force acting on the electron is given by the formula as :

F=q(v\times B)

q is the charge on proton

v is the speed of proton

B is the magnetic field

It is mentioned that the proton is moving with a velocity in the positive x-direction. The uniform magnetic field B in the positive y-direction such taht,

q = +e

v = vi

B = Bj

F=e(v\ i\times B\ j)

Since, i\times j=k

F=(evB)\ k

So, the magnetic force acting on the proton in positive z axis. Hence, the correct option is (d) "positive z direction".

8 0
3 years ago
Madison was driving at 40 mph and went 80 miles. How long did it take madison?
monitta
v=40\ mph\\\\s=80\ miles\\\\t=?\\--------------\\v=\frac{s}{t}\to vt=s\to t=\frac{s}{v}\\--------------\\t=\frac{80\ miles}{40\ mph}=2\ h\leftarrow Answer
3 0
3 years ago
Read 2 more answers
FIND THE WEIGHT OF A 80 KG MAN ON THE SURFACE OF MOON? WHAT SHOULD BE HISS MASS ON THE EARTH AND ON THE MOON? (ge = 9.8 m/s2 ; g
elena55 [62]

Weight = (mass) x (acceleration of gravity at the place where the mass is) .

Man's mass = 80 kg

His weight on Earth = (80 kg) x (9.8 m/s²) = 784 newtons (about 176 pounds)

His weight on the Moon = (80 kg) x (1.63 m/s²) = <em>130.4 newtons</em> (about  29.2 pounds)

His mass is <em>80 kg</em>.  Mass is the thing about him that doesn't change. 
He has the same mass on the Earth, on the Moon, or anywhere.

8 0
2 years ago
The pedals on a bicycle give a mechanical advantage by allowing you to turn the pedals a __________ distance to turn the _______
denpristay [2]
Short distance to turn the circumference of the wheels. Mechanical advantage is load/effort I think
6 0
3 years ago
Read 2 more answers
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