Q.1 Select the best answer: i. What do Simple Machines do? a) has the fulcrum between the effort and the load b) fixed point of a lever c) a twisting or turning as a result of a push or pull d) change size or duration of the force T
Answers
Answer:
i) Ans- Simple Machines are used to modify motion and the magnitude of a force in order to perform work. They are the simplest mechanisms known that can use leverage (or mechanical advantage) to increase force.
a) Ans- In a first class lever the effort (force) moves over a large distance to move the load a smaller distance, and the fulcrum is between the effort (force) and the load. As the ratio of effort (force) arm length to load arm length increases the mechanical advantage of a first class lever increases.
b) Ans- Fixed point of a lever is called the fulcrum.
c) Ans- A twisting or turning as a result of a push or pull is called force.
d) Ans- When a force acts on an object, the object may change shape by bending, stretching or compressing - or a combination of all three shape changes.