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Questions and Answers
Match the following fruits with their color:
Match the following fruits with their color:
Banana = Yellow Apple = Red Grapes = Purple Orange = Orange
Match the following countries with their capitals:
Match the following countries with their capitals:
United States = Washington, D.C. France = Paris Japan = Tokyo Germany = Berlin
Match the following animals with their habitats:
Match the following animals with their habitats:
Penguin = Antarctica Camel = Desert Frog = Swamp Eagle = Mountains
Match the following planets with their order from the Sun:
Match the following planets with their order from the Sun:
Match the following musical instruments with their types:
Match the following musical instruments with their types:
Match the following shapes with their number of sides:
Match the following shapes with their number of sides:
Match the following elements with their chemical symbols:
Match the following elements with their chemical symbols:
Match the following inventors with their inventions:
Match the following inventors with their inventions:
Match the following programming languages with their creators:
Match the following programming languages with their creators:
Match the following books with their authors:
Match the following books with their authors:
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Study Notes
Newton's Law of Gravitation
- The force of attraction between two particles is directly proportional to the product of the masses and inversely proportional to the square of the distance of separation.
- The mathematical formula for Newton's law of gravitation is: F = Gm₁m₂/r²
- The value of G is 6.67 × 10⁻¹¹ Nm²/kg²
Earth and Moon
- The mass of the earth is approximately 6.0 × 10²⁴ kg.
- The mass of the moon is approximately 7.3 × 10²² kg.
- The distance between the earth and the moon is approximately 4.0 × 10⁸ m.
- The force of attraction between the earth and the moon is approximately 1.75 × 10²⁰ N.
Orbital Motion
- When the earth is in orbit around the sun, the centripetal force equals gravitational force.
- The velocity of the earth in orbit can be calculated using the formula: v = √(GM/R)
- The period of the earth's orbit can be calculated using the formula: T² = 4π²R³/GM
The Earth's Characteristics
- The earth is considered spherical in shape.
- The mass of the earth is concentrated at its center.
- g is considered constant at all points on the earth.
- The earth is considered a fixed stationary.
- The weight of the body acts along a line joining the centers of the earth and the body.
Gravitational Field
- A gravitational field is the region in which a mass will experience gravitational force of attraction.
- The gravitational field strength, or intensity (g) of the earth is defined as the gravitational force acting on a unit mass placed in the field.
- Mathematically, g = F/m
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