Q:

How much force do you exert when you lift a 50-pound dumbbell?

A:

Quick Answer

A 50 pound-mass dumbbell is pulled downward by the Earth's gravitational field at an acceleration of 32.174 feet-pound-mass per second squared, so the force to lift it is 1,608.7 pounds-force. Newton's second law of motion states that force is equal to mass multiplied by acceleration, gravitational or otherwise.

Know More

Full Answer

A pound-mass needs to be distinguished from pound-force because they are not equivalent units. A pound-mass refers to how much mass an object possesses; in the case of the dumbbell, it is a 50-pound-mass object. A pound-force is the unit of force that an object is acted upon. In the example given, lifting a 50-pound-mass weight requires 1,608.7 pounds-force away from the surface of the Earth.

Learn more about Motion & Mechanics

Related Questions

  • Q:

    What is the net force formula?

    A:

    The formula for calculating net force is the mass of the object multiplied by the acceleration. This formula is commonly written as "F = ma", where "F" represents the net force, "m" represents the mass and "a" represents the acceleration.

    Full Answer >
    Filed Under:
  • Q:

    How are force and mass related?

    A:

    Force and mass are related by their opposite influence on acceleration: Force increases acceleration, whereas mass causes acceleration to decrease. Mass is a measure of resistance to acceleration and force is an interaction that causes acceleration, according to The Physics Hypertextbook. Both represent scientific entities acting on the rate of change in velocity of an object, defined as acceleration.

    Full Answer >
    Filed Under:
  • Q:

    What is Newton's second law in terms of Atwood's machine?

    A:

    Newton’s second law states that the force acting on an object is directly related to the acceleration. The law is formulated as F = m x a, where F = force, a = acceleration and m = mass of the object in motion. In terms of Atwood’s machine, a force equal to the difference in the suspended weights accelerates the total mass, m1+ m2.

    Full Answer >
    Filed Under:
  • Q:

    How much force of impact can an egg withstand?

    A:

    A typical eggshell takes a little more than 5.5 pounds of force to crack. A 30-pound cement block can be supported by eight eggs spread out over the block, still in cardboard egg containers. The raw calculation of 30 pounds divided by eight yields 3.75 pounds of force.

    Full Answer >
    Filed Under:

Explore