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Questions and Answers
What is the SI unit of mass?
What is the SI unit of mass?
When you step on a scale, it measures your weight accurately.
When you step on a scale, it measures your weight accurately.
False
What is the difference between mass and weight?
What is the difference between mass and weight?
Mass is the measure of the amount of matter in an object, while weight is the measure of the force of gravity on that object.
A force of 1 newton is equal to an acceleration of one ___________ one meter per second per second.
A force of 1 newton is equal to an acceleration of one ___________ one meter per second per second.
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Match the following quantities with their units:
Match the following quantities with their units:
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If you weigh 100kg on Earth, how much force do you exert on the scale?
If you weigh 100kg on Earth, how much force do you exert on the scale?
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Study Notes
Mass vs Weight
- Mass is the measure of the number of atoms in an object.
- The SI unit of mass is the kilogram (kg).
Key Differences
- Weight is the measure of the force that gravity is pulling on an object.
- Weight is a force and is technically measured in newtons (N).
Gravity's Effect on Weight
- Weight can change based on the gravitational pull of a location.
- Example: You weigh less on the moon than on Earth due to a weaker gravitational force.
Calculating Weight
- To find the weight of an object, multiply its mass by the gravitational force (9.8 N/kg).
- Example: A 100kg dog exerts a force of 980N on a scale (100kg x 9.8 = 980N).
Important Distinctions
- Mass is an exact measure, while weight is an estimate.
- A scale measures mass accurately, but estimates weight based on the force exerted on it.
Summary
- Mass is a measure of the amount of matter in an object.
- Weight is a measure of the force of gravity pulling on an object.
- SI units: kg for mass, N for weight.
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Description
Understand the difference between mass and weight, including how they are measured and how weight can change depending on location due to gravity.
