Podcast
Questions and Answers
What determines the weight of an object on Earth?
What determines the weight of an object on Earth?
What is the equation to compute weight on Earth?
What is the equation to compute weight on Earth?
If an object's mass increases, what happens to its weight?
If an object's mass increases, what happens to its weight?
What is the gravitational field strength on Earth?
What is the gravitational field strength on Earth?
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How does gravity on the moon compare to gravity on Earth?
How does gravity on the moon compare to gravity on Earth?
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When throwing a ball upward, what happens as it moves closer to the ground?
When throwing a ball upward, what happens as it moves closer to the ground?
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What force opposes the motion when pushing or pulling a wooden crate on the floor?
What force opposes the motion when pushing or pulling a wooden crate on the floor?
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Study Notes
Weight and Gravity
- The weight of an object on Earth is determined by both its mass and the gravitational field strength of the planet.
- The equation to compute weight on Earth is W = mg, where W is the weight, m is the mass, and g is the gravitational field strength.
Effect of Mass on Weight
- If an object's mass increases, its weight also increases, as long as the gravitational field strength remains constant.
Gravitational Field Strength on Earth
- The gravitational field strength on Earth is approximately 9.8 N/kg or 9.8 m/s^2.
Gravity on the Moon vs Earth
- Gravity on the moon is about 1/6 of the gravity on Earth, due to the moon's smaller mass and radius.
Motion and Gravity
- When throwing a ball upward, its weight is opposite to the direction of its motion, and as it moves closer to the ground, its weight increases, causing it to accelerate downward.
Frictional Force
- The force that opposes the motion when pushing or pulling a wooden crate on the floor is friction, which acts opposite to the direction of motion.
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Description
This quiz explores the concept of weight as the force of gravity acting on an object based on its mass and the gravitational field strength. In this scenario, a mass of 40 kg is used to calculate the corresponding weight on Earth.