Newton’s Laws of Motion Forces cause changes in motion.
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Transcript of Newton’s Laws of Motion Forces cause changes in motion.
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Newton’s Laws of Motion
Forces cause changes in motion.
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Preliminary Question:• What do all of the following have in common?
Newton’s Laws of Motion
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• Once an object is moving, no force is needed to keep it moving
• Only if friction is present, you need to push something to keep it moving
• Without friction, a moving object keeps on moving at constant velocity
Galileo on Motion
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a. Ball rolls down - downward push (from gravity) – speed up
b. Ball rolls upward - downward push (from gravity) – slow down
c. Ball rolls on a level floor, the floor compensates for gravity, no push – constant velocity
Galileo on Motion
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Galileo stated:Every object has this tendency to keep moving
without changing its motion if it was moving; or to remain at rest if it was at rest
The property of a body to resist changes to its state of motion is called inertia.
Mass – is a quantitative measure of an object’s inertia
Galileo on Motion
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Our Experimental Evidence: Ball Lab
No push: ball rolls at constant velocity
Yes - PUSH: balls ACCELERATE
Forces cause changes in motion.
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Newton’s First Law of Motion: Inertia• Every object continues in a state of rest, or of
uniform speed in a straight line, unless acted on by a nonzero net force.
Simply put, things tend to keep on doing what they’re already doing. – Objects in a state of rest tend to remain at rest. – Only a force will change that state.
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Newton’s First Law of Motion: Inertia
Don’t let this be you. Wear your seat belt.
Because of inertia, objects (including you) resist changes in their motion. When the car going 80 km/hour is stopped by the brick wall, your body keeps moving at 80 km/hour.
Simply put, things tend to keep on doing what they’re already doing.
Objects in a state of motion tend to remain in motion with constant speed in a straight line. Only a force will change that state.
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• Observe what happens to the crash dummies in the video. Explain using Newton’s First Law.
• Crash Test• Observe what happens to the curling stone in
the video. Explain using Newton’s First Law.• curling
Newton’s First Law of Motion
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Newton’s First Law of Motion: Inertia
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Newton’s First Law of Motion• Cruising airliner moves at constant velocity
because all forces acting on it are balanced
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Newton’s Laws of Motion• All forces balance so the airliner
moves at constant velocity
• Unbalanced force from the club accelerates the
golf ball