Homeroom-SIT IN YOUR ASSIGNED SEAT! NO ELECTRONICS!!
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Warm-up A scientist noticed that all of the offspring of a bacteria are
identical to the parent. However, in dogs, the offspring are all different. What most likely caused this to occur?
a) Bacteria produced offspring through asexual reproduction, while the dog produced offspring through sexual reproduction.
b) Bacteria produced offspring through sexual reproduction, while the dog produced offspring through asexual reproduction.
c) Both bacteria and the dog produced offspring through asexual reproduction.
d) Both bacteria and the dog produced offspring through sexual reproduction.
Force and Net Force•Force is a push
or a pull on an object.
•Net force is the total force on an object.
Unbalanced ForceBalanced Force
• Unbalanced Force can cause an object to move, stop moving, or change direction.
•The balanced forces are the forces in equal and opposite directions.
•The balanced forces are the forces in equal and opposite directions.
Inertia –An object at rest will stay at rest unless acted upon by an outside force.
–Inertia is every objects resistance to change its motion.
Newton’s First LawNewton’s First Law
Greater mass
means
Greater inertia
Greater mass
means
Greater inertia
Newton’s Second Law
• The acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to the object’s mass.
How much Force was required to make a 2000kg car accelerate at
5m/s/s?
1 2 3
33% 33%33%
1. 400N
2. 0.001N
3. 10,000N
• Force=Mass x acceleration• F=ma• F=2000kg x 5m/s/s• a= 10,000N or kgxm/s/s
4 Types of Friction• The 4 types of friction are: 1. Sliding friction (strongest)2. Rolling friction 3. Fluid friction (weakest).4. Static friction
•What type of friction?
•What type of friction?
Air Resistance and Weight
• Air resistance is a type of fluid friction on falling objects. Weight is the force of gravity on an object at the surface of the Earth.
Gravity Between Objects• The force of gravity between objects
increases with greater mass and decreases with greater distance.
Newton’s Third law• If an object exerts a force
on another object, the second object, exerts an equal force in the opposite direction.
Momentum• The momentum of an object
is the product of its mass and velocity.
• In other words:
Momentum = mass x velocityMomentum = mass x velocity
•Kg x m/s•Kg x m/s