The diagram shows a light horizontal beam pivoted at its center with two crates, A and B, resting on it.
Explain what happens to the beam when any supports holding it horizontal are removed and it is allowed to pivot freely.
Calculate the distance from the pivot that Crate B must be placed to balance the beam when Crate A is positioned 0.8 m from the pivot.
Use the equation: moment of a force=force×distance\text{moment of a force} = \text{force} \times \text{distance}moment of a force=force×distance
Crate A has a weight of 490 N.
Calculate the mass of Crate A.
Use the equation: weight=mass×gravitational field strength\text{weight} = \text{mass} \times \text{gravitational field strength}weight=mass×gravitational field strength (Take gravitational field strength, g=9.8 N/kgg = 9.8\text{ N/kg}g=9.8 N/kg)
Crate A is resting on a horizontal storage shelf. The area of the bottom of the crate in contact with the shelf is 0.14 m2.
Calculate the pressure Crate A exerts on the shelf.