Physics, 27.07.2019 16:50 QueenLife4869

A0.64 kg bullfrog is sitting at rest on a level log. how large is the normal force of the log on the bullfrog?

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... If nothing is moving, then nothing is accelerating.

... If nothing is accelerating, then the net force on the frog is zero,
and we know the forces on the frog's posterior are balanced.

... So the normal force of the log acting upward on the frog is
identical to the weight of the frog acting downward on the log.

... The frog's weight is (mass) x (gravity)

= (0.64 kg) x (9.8 m/s²)

= 6.27 kg-m/s²

= 6.27 Newtons

Answer from: Quest

terd muffin is the correct answer

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

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