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Published byDeirdre Heath
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SECTION 3 Motions and Forces
A. Second law of Motion An object acted on by an unbalanced force will accelerate in the direction of the force.
1. Acceleration equals force divided by mass, or a=force/mass
2. Force is equal to the combination of all forces, or the total force that acts on an object.
B. Second law can also be used to find force if mass and acceleration are known.
1. Near Earth’s surface, the force of gravity causes all objects to fall with the same acceleration – 9.8m/s2
A. For any object that is falling, the force of gravity equals mass times acceleration due to gravity, or F=m X (9.8 m/s2)
2. Weight and Mass are not the same thing.
A. Weight changes when the acceleration due to gravity changes.
B. Mass remains the same no matter what weight is.
C. Friction A force that resists motion and is always present between two moving surfaces.
1. Static Friction- Keeps a stationary object from moving on a surface when a force is applied to the object.
2. Sliding Friction Occurs when two surfaces slide past each other; slows down the moving object.
3. Rolling Friction Friction between a surface and a wheel when the wheel rolls over the surface.
4. Air resistance- Typical action of air molecules on a forward- moving object, slowing its motion.
Section 4: Newton’s Third Law A. Third law of Motion- Forces always act in equal but opposite pairs.
1. When a force is exerted on an object, the object exerts the same amount of force.
2. Third law of motion applies whether forces are contact or Long- range.
B. Things move because action and reaction forces work on different objects.
1. Friction is a factor in the third law.
2. Using the second law equation, the object with the larger mass has the smaller acceleration if the same force is applied.
3. All objects in the universe exert a force on all others; however, differences in mass may make these forces unnoticeable.
C. The three laws of motion described how any object moves when forces act on it.
Chapter: Forces and Changes in Motion
Chapter 11: Force and Newton’s Laws
Forces and Motion 2 Force
Newton’s Laws and Forces. Forces Force = a push or pull – changes speed of an object – changes direction of an object – can be touching or long distance.
FORCES Mrs. Cholak.
Motion - a change in position of an object, caused by an object Force – a push or a pull, caused by another object Force Can – Start Motion Stop Motion.
Motion Notes Speed Momentum Acceleration and Force Friction and Air Resistance Newton’s Laws of Motion.
Chapter 2: Force and Newton’s Laws
Friction Gravity Newton’s Laws Momentum Forces.
Force and Newton’s Laws Newton’s First Law. A. Force—push or pull on an object 1. The combination of all the forces acting on an object is the net force.
8 th Science-Force and Newton’s Laws. Newton’s First Law Also known as the Law of Inertia States that an object in motion stays in motion and an object.
Friction, Gravity, and Pressure Friction Friction - The force that one surface exerts on another when the two rub against each other. Acts in a direction.
Week #2 Notes Monday, October 17 th Reminder: Week #2 Vocabulary and notes are Due on Friday, October 21st.
Define force What is the difference between a balanced force and unbalanced force? What is the net force? How do you combine forces?
What is net force?.
Newton’s Laws of Motion
JEOPARDY Force and motion. Force Motion 2 Motion 2 Newton’s Laws Newton’s Laws of Motion of Motion Newton’s Laws Newton’s Laws of Motion 2 of Motion 2.
Forces Pages 188 to 191. Forces Force - a push or a pull, measured in Newtons (N) Contact Force – is a push or a pull one object applies to another object.
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