Newtons Laws of Motion
Mateya Robinson Period-5
Isaac Newton
In 1667, he developed 3 laws of motion that describe movement of objects in terms of forces
We still use these 3 laws of motion to this day
Newtons 1st Law of motion
- Newtons 1st Law of motion is often called the law of inertia
- All objects will just keep on doing what they are doing unless it is acted on by an unbalanced force
- All object resist changes in their state of motion. In the absence of an unbalanced force, an object in motion will maintain this state of motion
Newtons 2nd Law of motion
- The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass
- F = ma
- Force = Mass x Acceleration
- Units:
- Force = newtons or kg m/s sq
- Mass = Kilograms
- Acceleration = m/s/s or m/s sq
practice problem
Mike's car, which weighs 1,000 kg, is out of gas. Mike is trying to push the car to a gas station, and he makes the car go 0.05 m/s/s. Using Newton's Second Law, you can compute how much force Mike is applying to the car.
F=1,000kg x 0.05m/s/s
Answer = 50 newtons
Newtons 3rd Law of Motion
This means that for every force there is a reaction force that is equal in size, but opposite in direction. That is to say that whenever an object pushes another object it gets pushed back in the opposite direction equally hard.
The rocket's action is to push down on the ground with the force of its powerful engines, and the reaction is that the ground pushes the rocket upwards with an equal force.
Newtons 3 laws of motion
2nd law-the acceleration of an object will stay in the same direction as the net force on the object ( A= F/M)
3rd law- When an object exerts a force on the first that is equal in strength and opposite in direction