Sam is an athlete whose main event is hammer throw. During his training session he is instructed
to practice hammer with different weights. He is able to put a 7 kg hammer 8 meters away and a 4
kg hammer 12 m away when he had applied his maximum strength. Which law of motion applies
in such case?
a. Second Law of motion- The rate of change of acceleration is proportional to the force applied.
b. First Law of motion- A body continues to be in the state of motion until obstructed by an
external force.
c. Second Law of motion- The rate of change of acceleration is proportional to the mass of the
object.
d. Third law of motion- The force applied by the athlete is equally reacted back.
Answers
Answer:
Proprioceptive neuro muscular facilitation method (1) 2. Sam is an athlete whose main event is hammer throw. During his training session he is instructed to practice hammer with different weights. He is able to put a 7 kg hammer 8 meters away and a 4 kg hammer 12 m away when he had applied his maximum strength.
Explanation:
A) Newton's Second Law of Motion Applied to Mechanical Systems Modeling. Newton's second law of motion states that the acceleration of a particle ( a = x ¨ = d 2 x ( t ) / d t 2 ) is proportional to the force applied to it and is in the direction of this force.
B) Newton's first law of motion states that a body at rest remains at rest, or, if in motion, remains in motion at a constant velocity unless acted on by a net external force. This is also known as the law of inertia. Inertia is the tendency of an object to remain at rest or remain in motion.
C) The second law states that the rate of change of momentum of an object is directly proportional to the force applied, or, for an object with constant mass, that the net force on an object is equal to the mass of that object multiplied by the acceleration.
D) When we push a truck parked along the roadside, then the road applies a static friction force in the opposite direction of force applied on the truck to oppose the motion of the truck. The static friction is adjustable in nature, i.e., the road offers only the required amount of friction force to keep the truck at rest. If we apply more force, the road applies more friction force (up to the highest value, known as limiting value of static friction. Hence the friction force cancels out the force applied.
Here student's justification is that the two opposite and equal forces cancel each other and hence the truck does not move. However, the action and reaction forces do not cancel each other as they act on the different bodies whereas the truck did not move due to zero net force which is balanced by the static friction of the truck.
Answer:
Second Law of motion- The rate of change of acceleration is proportional to the mass of the