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Questions and Answers
What force opposes motion between objects that are touching?
What force opposes motion between objects that are touching?
- Gravity
- Magnetism
- Inertia
- Friction (correct)
Which bird is capable of carrying large prey while flying?
Which bird is capable of carrying large prey while flying?
- Sparrow
- Kestrel
- Eagle (correct)
- Pigeon
What measurements describe the weight of an object?
What measurements describe the weight of an object?
- Strength of gravity's pull (correct)
- Density and volume
- Mass and speed
- Height and width
Why would a kestrel not be able to carry prey heavier than 1 kg?
Why would a kestrel not be able to carry prey heavier than 1 kg?
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What is required to move a heavy object, like a rocket, away from Earth?
What is required to move a heavy object, like a rocket, away from Earth?
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Study Notes
Forces in Motion
- Friction opposes motion between two touching objects, slowing down or preventing movement.
- Gravity is a fundamental force that attracts objects toward the Earth's center, acting on all masses.
Weight and Mass
- An eagle can weigh up to 29 kg (63 lb) and is capable of carrying large prey while flying.
- Kestrels are significantly lighter, weighing less than 1 kg (2 lb), limiting their ability to carry weight due to the effects of gravity.
- An object's weight represents the strength of gravitational pull acting upon it, influencing how heavy it feels.
Comparative Weights
- A large rock's weight exceeds that of a pillow because gravity exerts a stronger downward force on the rock.
- Heavy objects, like rockets, require a substantial unbalanced force to overcome gravitational pull to launch successfully into space.
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