Newtons Law Doodle NOtes 1 st Law of
- Slides: 23
Newton’s Law Doodle NOtes
1 st Law of Motion An object remains at rest or continues to move at a constant velocity unless acted upon by an external net force In other word: An unbalanced force is needed to change the velocity of an object
2 nd Law The acceleration of an object is proportional to the net force action upon it and inversely proportional to the object mass. In other words: Fnet=ma; a great force increase acceptation, a great mass decrease acceleration.
3 rd Law When one body exerts a force on a second body For every action force the second exerts a there is an equal and force on the first that is opposite reaction force. equal in magnitude but opposite in direction.
Net Force The sum of all of the force acting on an object
Newton’s First Law: The Law of inertia If the net external force on an object is zero the object’s velocity will remain unchanged.
True/False If an object is stationary, There may be some it must have no external force but they forces acting on it would be balanced.
True/False If you throw a ball in space the ball will keep going in the same direction at the same speed There is no force to change the velocity
True/False While sitting in a moving bus you throw an apple up into the air. The apple will land back in your hand. The apple, you and the bus all have the same horizontal velocity with no force changing it
True/False A bus accelerates The apple would appear forward. If an apple were to move toward the back on the floor of the bus it of the bus would move forward.
Buckle UP!!! No seatbelts You keep moving until something exert a force to stop you. With seatbelt exerts a force stop you.
Fnet=ma Net=Sum of all forces Fnet = m(kg)a(m/s 2) Newtons=(kg)(m/s 2)
Newton’s Second Law Draw it!! Write it
Newton’s Second Law -------> a-------> f 1 Mass ---> a--> f 2 Mass Draw it!! -------> a-------> f Mass ---> a--> f
Newton’s Second Law Write it!! Ifthe force increases so does the acceleration. If the mass increases the acceleration decrease.
Airplane Using the FBD and Newton’s 2 nd Law to determine the acceleration of a 5600 kg airplane.
Newton’s 3 rd law For energy action force there exists an equal and opposite reaction force.
Newton’s Third Law Action: Reaction: Earth pulls on the satellite The satellite pulls on the earth. *Earth does not accelerate as much due to its large mass
Use the Law of Force Pairs to explain how things acceleration The car’s tires grip the road and push the road backwards. The reaction force move the car forward; the road pushes the car forward.
Hockey An 80 -kg hockey player checks a 65 -kg hockey player on frictionless ice. Draw the FBD for both hockey players.
The law of Force Pairs
When a bug hits a car’s windshield it splats because the force of the car on the bug is greater than the force of the bug hitting the car. True/False
