If force = mass x acceleration, What is the force applied to a 20 kg rock that is acceleration at a 20 m/s^2?
2 answers:
Answer: 400 N
Explanation:
Newton's second law states that the force applied to an object is directly proportional to the acceleration of the object, following the relationship
where
F is the force applied
m is the mass of the object
a is the acceleration
In this problem, we have
m=20 kg is the mass of the rock
is its acceleration
Therefore, the force applied on the rock is
You might be interested in
In a real system of levers, wheel or pulleys, the AMA (actual mechanical advantage) is less than the IMA (ideal mechanical advantage) because of the presence of friction.
In fact, the IMA and the AMA of a machine are defined as the ratio between the output force (the load) and the input force (the effort):
however, the difference is that the IMA does not take into account the presence of frictions, while the AMA does. As a result, the output force in the AMA is less than the output force in the IMA (because some energy is dissipated due to friction), and the AMA is less than the IMA.
In fact, the IMA and the AMA of a machine are defined as the ratio between the output force (the load) and the input force (the effort):
however, the difference is that the IMA does not take into account the presence of frictions, while the AMA does. As a result, the output force in the AMA is less than the output force in the IMA (because some energy is dissipated due to friction), and the AMA is less than the IMA.