How is mass different from weight Mass the
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How is mass different from weight? • Mass – the amount of matter in an object • Weight – the force that acts upon an object You are weightless in free-fall! © 2010 Pearson Education, Inc.
Clicker Question On the Moon: A. B. C. D. My weight is the same, my mass is less. My weight is less, my mass is the same. My weight is more, my mass is less. © 2010 Pearson Education, Inc.
Clicker Question On the Moon: A. B. C. D. My weight is the same, my mass is less. My weight is less, my mass is the same. My weight is more, my mass is less. © 2010 Pearson Education, Inc.
Clicker Question Why are astronauts weightless in space? A. There is no gravity in space. B. The astronauts are in a state of free-fall. C. The Earth and moon pull equally on them. © 2010 Pearson Education, Inc.
Clicker Question Why are astronauts weightless in space? A. There is no gravity in space. B. The astronauts are in a state of free-fall. C. The Earth and moon pull equally on them. © 2010 Pearson Education, Inc.
Why are astronauts weightless in space? • There is gravity in space. • Weightlessness is due to a constant state of free-fall. © 2010 Pearson Education, Inc.
How did Newton change our view of the universe? • Realized the same physical laws that operate on Earth also operate in the heavens Þ one universe • Discovered laws of motion and gravity Sir Isaac Newton (1642– 1727) © 2010 Pearson Education, Inc.
What are Newton’s three laws of motion? Newton’s first law of motion, also called Law of Inertia: An object stays at rest or continues in motion unless acted upon by an outside force. © 2010 Pearson Education, Inc.
Newton’s second law of motion: The acceleration of an object is proportional to the force applied. Force = mass acceleration Weight = mass x g (acceleration due to gravity) © 2010 Pearson Education, Inc.
