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3 years ago

What is called frictional force

Physics

2 answers:

baherus [9]3 years ago

3 0

Answer:

<em>Friction, force that resists the sliding or rolling of one solid object over another.</em>

Olenka [21]3 years ago

3 0

Frictional force is the opposing force that is created between two surfaces that try to move in the same direction or that try to move in opposite directions. The main purpose of a frictional force is to create resistance to the motion of one surface over the other surface.

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A 2 kg watermelon is dropped from a 4 m tall roof. How fast will the watermelon be moving as it strikes the ground below?

Volgvan

Answer:

8.85m/s

Explanation:

v=√2gh

v=√2×9.8×4

v=8.85m/s

3 0

3 years ago

A rope connects boat A to boat B. Boat A starts from rest and accelerates to a speed of 9.5 m/s in a time t = 47 s. The mass of

Contact [7]

Answer: 339.148N

Explanation:

Data

Time (t) = 47s

U = 0m/s

V = 9.5m/s

Mass of B = 540kg

Frictional force on B = 230N

Both boats are connected so if A moves, B moves too.

Acceleration of boat A =?

Using equation of motion,

V = u + at

9.5 = 0 + a*47

a = 9.5 / 47

a = 0.2021 m/s²

The force required to accelerate boat B since it's the same force moving both boats =?

F = Mass * acceleration

F = 540 * 0.2021 = 109.14N

A frictional force of 230N exists on boat B

Total force (Tension) = frictional force + normal force = (109.15 + 230)N = 339.148N

7 0

3 years ago

The elements in group 17 of the periodic table are all called halogens. All halogens have the same

Savatey [412]

Answer:

All halogens have the same NUMBER OF VALENCE ELECTRON

The group pf periodic table is based on their valence electron

Hope this is correct and helpful

HAVE A GOOD DAY!

8 0

3 years ago

Read 2 more answers

How do the densities of the jovian and terrestrial planets compare?

timofeeve [1]

Hello

The jovian density is $1.33~g/cm^3$ , while the density of terrestrial planets is much higher. For instance, the earth's density is $5.51~g/cm^3$ . The reason of this difference is in the different chemical composition: while jupiter is made of gas (mainly hydrogen), with lower density, while the terrestrial planets are made of solid and liquid, with compounds of higher density.