Question

1) The turning effect of force on a door is greater when it is applied at
a) A point near the hinge and perpendicular to the door
b) A point near the hinge and parallel to the door
c) A point far away from hinge and parallel to the door
d) A point far away from the hinge and perpendicular to the door

2) a hot day, a child drinks all the water in a plastic bottle. She then screws the cap back tightly on the bottle, so that the bottle contains only air. She throws the bottle into a wastebasket, where the Sun shines on it. After a while in the Sun’s rays, the air in the bottle is much hotter than before.
(i) State what has happened to the pressure of the air in the bottle. Give a reason for your answer.
(ii) In terms of the behaviour of the air molecules, explain your answer to a(i)
3) A pair of pliers is gripping a nut. a. How much force is applied to the nut if it is 3 cm from the pivot and the centre of the applied load of 40 kg is 10 cm from the pivot?

Answer 1

Answer:

Forces can cause an object to rotate and the turning effect of the force is called a moment. If a resultant force acts on an object about a fixed turning point (the pivot) it will cause the object to rotate e.g. turning a nut with a spanner, applying a screwdriver, opening a door fixed on hinges.

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Answer 2

1. c) A point away from the hinges and parallel to the door.

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