Para-jumble (sentence arrangement): Arrange P–Q–R–S to complete the explanatory paragraph about gravitational force. S1 = "A force exists between every body in the universe." P = "Normally it is very small, but when one of the bodies is a planet like Earth, the force is considerable." Q = "It has been investigated by many scientists including Galileo and Newton." R = "Everything on or near the surface of the Earth is attracted by the mass of the Earth." S = "This gravitational force depends on the mass of the bodies involved." S6 = "The greater the mass, the greater is the Earth's force of attraction on it. We can call this force of attraction gravity." Between S1 and S6, place P–Q–R–S in a coherent scientific order. Choose the correct sequence of P–Q–R–S that completes the paragraph.

Given data

• S1 introduces a universal force (gravity).
• Fragments discuss magnitude (P), examples near Earth (R), historical investigation (Q), and dependence on mass (S).
• S6 summarizes the mass dependence and names the force.

Concept/Approach
Provide an intuitive path: quantify magnitude (P) → give a concrete example (R) → note historical study (Q) → state the mass dependence rule (S) → conclude (S6).

Step-by-step reasoning
After S1, P qualifies the size of the force and notes why it is significant with planets. R supplies a familiar example: Earth's mass attracting objects near its surface. Q acknowledges scientific investigation, maintaining informational flow. S states the general law: dependence on mass, which leads smoothly into S6's "greater the mass, greater the attraction."

Verification
Ending the block before S6 with S ensures immediate logical continuity into S6's law-like summary.

Common pitfalls
Placing Q at the start interrupts the physical explanation with history before the reader understands the phenomenon.

Final Answer
PRQS