definition: an object at rest remains at rest and an object in motion maintains its position unless...
TRANSCRIPT
Definition: An object at rest remains at rest and an object in motion maintains its positionunless it experiences an Outside force.
Newton’s 1st Law
Inertia is the tendency of an object at rest to remain at rest or, if moving, to continue moving with a constant velocity.
All objects have inertia because they resist changes in motion.
The greater the massof the object the more force required to change it’s motion.
Newton’s 1st Law
Definition: The unbalanced force acting on an object
equals the object’s mass times its acceleration.
Mathematically represented by the equation:Force= mass x acceleration or F=ma
Cenzo was here
Remember the SI unit for force is a Newton
Newton= 1 kg x m/s2 towards center of the earth
Newton 2nd Law
Definition: the motion of a body when only the
force of gravity is acting on it
Acceleration near the Earth’s surface is constant.
All objects on Earth accelerate at exactly 9.8 m/sec/sec.
Gravity is abbreviated as g
Free Fall
Definition: The force on an object due to
gravity is called its weight
1 Newton= 1 kg x m/s2 towards center of the earth= 0.22481 lbs or pounds
Weight
Astronauts and their surroundings all
accelerate at the same rate. Consequently, the floor of the shuttle pushes up against the
astronauts or objects in the shuttle.
Apparent Weightlessness
Definition: the terminal velocity reached by a falling
object whose acceleration is zero. The terminal velocity of a falling body occurs during free fall when a falling body experiences zero acceleration. This is because of the retarding force known as air resistance. Air resistance exists because air molecules collide into a falling body creating an upward force opposite gravity. This upward force will eventually balance the falling body's weight. It will continue to fall at constant velocity known as the terminal velocity.
http://hypertextbook.com/facts/JianHuang.shtml
Terminal Velocity
1. What is the net force necessary for a 3.6 x
103 kg truck to accelerate forward at 2.0 m/s2.
2. A baseball accelerates downward at 9.8 m/s2. If the gravitational force acting on the baseball is 1.8 N, what is the baseball’s mass?
3. A bobsled and crew have a combined mass of 525 kg. If the bobsled experiences an unbalanced force of 1095 N pushing it forward, what is the bobsled’s acceleration?
Newton’s Second Law Math Problems
For every action force, there is an equal and
opposite reaction force.
Applies force always acts in pairs _.
Principle used in rocketry.
Newton’s 3rd Law
1. Why won’t the elephant move?
2. What is the difference between weight and mass?
3. If the elephant has a mass of2000 Kg and the person is pushingat 60 N what is the accelerationof the elephant?
End Check- complete on a separate sheet
4. State each of Newton’s three laws of motion in
your own words and give an example that demonstrate each law
5. Explain the difference between mass and weight. Does the weight of an object ever change? If so, when?
6. Using Newton’s laws, predict what will happen when a car traveling on a icy roada. Comes to a sharp bendb. Has to stop quickly
7. How much does a 7.0 kg puppy weigh on Earth?
End Check- complete on a separate sheet