11.1 Newton’s First Law. INERTIA An object at rest remains at rest, and an object in motion...

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11.1 Newton’s First Law

Transcript of 11.1 Newton’s First Law. INERTIA An object at rest remains at rest, and an object in motion...

Page 1: 11.1 Newton’s First Law. INERTIA An object at rest remains at rest, and an object in motion maintains its velocity unless it experiences an unbalanced.

11.1 Newton’s First Law

Page 2: 11.1 Newton’s First Law. INERTIA An object at rest remains at rest, and an object in motion maintains its velocity unless it experiences an unbalanced.

INERTIAAn object at rest remains at rest, and an object in motion maintains its velocity unless it experiences an unbalanced force

Page 3: 11.1 Newton’s First Law. INERTIA An object at rest remains at rest, and an object in motion maintains its velocity unless it experiences an unbalanced.

Stationary objects don’t want to move

Page 4: 11.1 Newton’s First Law. INERTIA An object at rest remains at rest, and an object in motion maintains its velocity unless it experiences an unbalanced.

Moving objects don’t want to stop

Page 5: 11.1 Newton’s First Law. INERTIA An object at rest remains at rest, and an object in motion maintains its velocity unless it experiences an unbalanced.

Mass is a measurement of inertiaMore mass = more inertiaTherefore mass which is a measure of the amount of matter in an object is also a measure of the inertia of an object

Page 6: 11.1 Newton’s First Law. INERTIA An object at rest remains at rest, and an object in motion maintains its velocity unless it experiences an unbalanced.

When you are in a car that is accelerating, you feel like you are being pushed back.When the car comes to a sudden stop,

your body wants to continue in a forward motion. Your body’s inertia is

resisting the change in speed.

Page 7: 11.1 Newton’s First Law. INERTIA An object at rest remains at rest, and an object in motion maintains its velocity unless it experiences an unbalanced.

When stopping, the coffee tends to spill forward

When accelerating, the coffee tends to spill on you.

Page 8: 11.1 Newton’s First Law. INERTIA An object at rest remains at rest, and an object in motion maintains its velocity unless it experiences an unbalanced.

Sudden Stops - seat belts help your body resist the tendency to keep moving.

Sudden Starts - head rests stop the head from being pushed back.

Page 9: 11.1 Newton’s First Law. INERTIA An object at rest remains at rest, and an object in motion maintains its velocity unless it experiences an unbalanced.

What will happen without seatbelt?

Page 10: 11.1 Newton’s First Law. INERTIA An object at rest remains at rest, and an object in motion maintains its velocity unless it experiences an unbalanced.

Misconception!!

- If no force acts on a moving object, it will eventually come to rest.

- Motion requires the presence on a force.Truth!!

- Only a force can cause a change in the motion of a moving object.

- An object moves at a constant velocity or not at all if there is no force acting on it.

What happens when you stop applying a force to an object?