Vocabulary
What is the physics definition of force?
A push or a pull exerted on an object
The force that pulls objects towards Earth
gravity
What is net force?
Net force is the overall force on an object when all the individual forces acting on the object are accounted for
What is Newton's First Law of Motion?
An object at rest will remain at rest. An object in motion will remain in motion, unless acted upon by an unbalanced force.
What units do our Force, Mass, and Acceleration need to be in order to accurately solve for Force?
Force - Newtons
Mass - kilograms
Acceleration - m/s/s
Define acceleration
A change in speed or direction
What is a projectile?
An object that is thrown
Gravity is a very important force on Earth. What is the acceleration due to gravity near Earth's surface?
9.8m/s/s
What is the equation that corresponds to Newton's second Law of Motion?
F=ma
What is the force needed to accelerate a 3kg bowling ball at 2m/s/s?
F = ma
F = 3kg * 2m/s/s
F = 6 N
What is the name used to describe the motion of a falling object when the only force acting on it is gravity?
Free Falling
What are balanced forces?
Equal forces acting on an object in opposite directions that do not change the object's motion.
There are 3 types of friction we learned about. List each kind and give an example of each.
Sliding, Rolling, and Fluid Friction: examples may vary
Newton's 1st Law of Motion is sometimes called "The Law of Inertia". What is inertia?
The tendency of an object to resist change in its state of motion
What is the acceleration of a 50kg object pushed with a force of 500N?
F = ma
500N = 50kg * a
10 m/s/s = a
What is air resistance?
The fluid friction experienced by objects falling through the air
State the Law of Universal Gravitation.
Gravity acts between all objects in the universe.
Air Resistance is a common type of friction that objects experience on Earth. Name one factor that could increase the amount of air resistance that an object experiences.
Velocity or Surface Area
State Newton's 3rd Law of Motion and give an example of an object experiencing it.
For every action, there is an equal but opposite reaction.
A 3 kg bucket of paint is accidentally dropped from the top of a ladder. What is the force with which the paint falls?
F=ma
F = 3kg * 9.8m/s/s
F = 29.4 N