Physics, 27.06.2019 03:00 only1kariyah

Aforce of 10. n toward the right is exerted on a wooden crate initially moving to the right on a horizontal wooden floor. the crate weight 25 n. 1)calculate the magnitude of the force of friction between the crate and the floor. 2)what is the magnitude of the net force acting on the crate? 3)is the crate accelerating? explain.

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Answer from: lukeperry

Solutions are (1) $5\;\rm{N$ (2) $5\;\rm{N$ (3) Yes, the crate will accelerate.

Explanation:

Given: A force of $10\;\rm{N$ toward the right is exerted on a wooden crate initially moving to the right on a horizontal wooden floor and the crate weight is $25\;\rm{N$

(1) The magnitude of the force of friction between the crate and the floor is formulated as: $F_f=\mu{mg$ .

$F_f=0.2\times25=5\;\rm{N$

(2) Two forces acting on the crate along the horizontal direction:

Since, the two forces are in opposite directions, the net force is given by their difference: $F_{net}=F-F_f=10-5=5\;\rm{N$

(3) Yes

The crate is accelerating. By using the Second Newton's Law:

$F_{net}=ma$

Where, $F_{net$ is the net force on the crate, is its mass, is its acceleration. Since, $F_{net$ is not , then the acceleration is also $\neq 0$ , so the crate is accelerating.

Learn more about Laws of forces here:

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Answer from: BreBreDoeCCx

1) 5 N

The crate is initially moving, so we must calculate the force of kinetic friction, which is given by:

$F_f = \mu_k mg$

where

$\mu_k=0.2$ is the coefficient of friction between the crate (made of wood) and the floor (made of wood). The coefficient of kinetic friction between wood and wood is about 0.2.

mg=25 N is the weight of the crate

Substituting the numbers into the formula, we find

F_f=(0.2)(25 N)=5 N

2) 5 N

There are two forces acting on the crate along the horizontal direction:

- The force that pushes the crate toward the right, of magnitude F=10 N

- The force of friction, which acts in the opposite direction (so, towards the left), of magnitude F_f = 5 N

Since the two forces are in opposite directions, the net force is given by their difference:

$F_{net}=F-F_f = 10 N-5 N=5 N$

3) Yes

The crate is accelerating. In fact, according to Second Newton's Law:

$F_{net}=ma$ (1)

where Fnet is the net force on the crate, m is its mass, a is its acceleration. We can immediately see that since Fnet is not zero, the acceleration is also non-zero, so the crate is accelerating.

We can even calculate the magnitude of the acceleration. In fact, the mass of the crate is given by:

$m=\frac{Weight}{g}=\frac{25 N}{9.8 m/s^2}=2.55 kg$

And by using (1) we find

$a=\frac{F_{net}}{m}=\frac{5 N}{2.55 kg}=1.96 m/s^2$

Answer from: Quest

The objects do not reach terminal velocity there is not enough time from the time the object falls from when it hits the ground to achieve terminal velocity. an object must be placed higher to achieve terminal velocity in order to be in free fall.

Answer from: Quest

Because its reliable. there is no pollution the chances of a radiation leak is low

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