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Newton’s First Law

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Page 1: Newton’s First Law. INERTIA An object at rest remains at rest, and an object in motion continues with constant velocity unless it experiences a net external

Newton’s First Law

Page 2: Newton’s First Law. INERTIA An object at rest remains at rest, and an object in motion continues with constant velocity unless it experiences a net external

INERTIAAn object at rest remains at rest, and an object in motion continues with constant velocity unless it experiences a net external force

Page 3: Newton’s First Law. INERTIA An object at rest remains at rest, and an object in motion continues with constant velocity unless it experiences a net external

Stationary objects don’t want to move

Page 4: Newton’s First Law. INERTIA An object at rest remains at rest, and an object in motion continues with constant velocity unless it experiences a net external

Moving objects don’t want to stop

Page 5: Newton’s First Law. INERTIA An object at rest remains at rest, and an object in motion continues with constant velocity unless it experiences a net external

When you are in a car that is accelerating, you feel as if you are being pushed back. Your body (actually the inertia of your body) is resisting the increase in speed. When the car comes to a sudden stop,

your body wants to continue in a forward motion.

Page 6: Newton’s First Law. INERTIA An object at rest remains at rest, and an object in motion continues with constant velocity unless it experiences a net external

When stopping, the coffee tends to spill forward

When accelerating, the coffee tends to spill on you.

Page 7: Newton’s First Law. INERTIA An object at rest remains at rest, and an object in motion continues with constant velocity unless it experiences a net external

Sudden Stops - seat belts help your body resist the tendency to keep moving. (rapid deceleration)

Sudden Starts - head rests stop the head from being pushed back. (rapid positive acceleration)

Page 8: Newton’s First Law. INERTIA An object at rest remains at rest, and an object in motion continues with constant velocity unless it experiences a net external

What will happen without seatbelt?

Page 9: Newton’s First Law. INERTIA An object at rest remains at rest, and an object in motion continues with constant velocity unless it experiences a net external

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?

Page 10: Newton’s First Law. INERTIA An object at rest remains at rest, and an object in motion continues with constant velocity unless it experiences a net external

External ForceA single force that acts on an object as a result of the interactions between objects and its environment

Page 11: Newton’s First Law. INERTIA An object at rest remains at rest, and an object in motion continues with constant velocity unless it experiences a net external

Net External ForceThe vector sum of all forces acting on a body. Can be found using the methods for finding resultant vectors

Page 12: Newton’s First Law. INERTIA An object at rest remains at rest, and an object in motion continues with constant velocity unless it experiences a net external

Objects motion is the same as if the net external force was the only force acting

on the object

Page 13: Newton’s First Law. INERTIA An object at rest remains at rest, and an object in motion continues with constant velocity unless it experiences a net external

Do forces always cause an object to move?

We need to talk about NET FORCES!NO!!

F1 = 30 NF2 = 10 N

Fnet = 20 N

Equilibrium occurs when the net force equals zero.

Page 14: Newton’s First Law. INERTIA An object at rest remains at rest, and an object in motion continues with constant velocity unless it experiences a net external

Object can be in equilibrium even when many forces act on it

When equal force but opposite direction, no change in motionIf one team applies greater force, acceleration will occur in the direction of that force

Page 15: Newton’s First Law. INERTIA An object at rest remains at rest, and an object in motion continues with constant velocity unless it experiences a net external

EquilibriumObjects that are either at rest or are moving with constant velocity are said to be in equilibriumWhen Σ FX= 0 and Σ FY = 0 then the vector sum of ALL forces acting on the body is equal to zero and the body is in equilibrium


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