Question

Question 3

Answer 1

Answer:

20 N

Explanation:

The gravitational force for block B will be given by mg where m is mass of the block and g is gravitational constant, in this case taken as $10 m/s^{2}$

Substituting 2 Kg for m we obtain

Fg=2*10=20 N

Therefore, the gravitational force exerted by block B is nearly 20 N and acts downwards

Answer 2

The gravitational force exerted on block B : 20 N

Further explanation

Newton's 2nd law explains that the acceleration produced by the resultant force on an object is proportional and in line with the resultant force and inversely proportional to the mass of the object

∑F = m. a

$\large {\boxed {\bold {a = \frac {\sum F} {m}}}$

F = force, N

m = mass = kg

a = acceleration m / s²

In this 2-beam system the forces acting on both:

Beam A = mg sin θ and string tension (T)

Beam B = mg and string tension (T)

So the force acting on the system:

∑F = m. a

mg sin θ -T + T-mg = m.a

Because what is being asked is the gravitational force acting on the block B , then :

F = mg

F = 2 kg. 10 m / s²

F = 20 N

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Keywords: system acceleration, The masses of blocks,friction, the gravitational force