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What is force?
a push or pull on an object
What is a balanced force? Example?
Occur when forces acting on an object are equal in size and opposite in direction.
ex. A book resting on a table (gravity pulls down, table pushes up with equal force).
What is an unbalanced force? Example?
Occur when forces acting on an object are not equal.
ex. Kicking a soccer ball (force from the kick makes it move).
What is inertia?
The tendency of an object to resist a change in its motion. (More mass, more inertia)
What is Newton’s First Law of Motion?
An object at rest will remain at rest. An object in motion will remain in motion until it is acted on by a force.
What is Newton’s Second Law of Motion?
The relationship between force, mass, and
acceleration. The heavier the object, the
more force it requires to accelerate.
What is Newton’s Third Law of Motion?
Every action has an equal and opposite
reaction
How do rockets demonstrate the three laws of motion?
The surface of the launcher pushes the rocket up whole gravity pulls it down.
The greater the force and the lower the rocket's mass, the greater its acceleration.
The rocket expels exhaust gases backward (action), which in turn pushes the rocket forward (reaction), enabling launch and flight.
How are force, mass and acceleration related?
an object with a larger mass needs a stronger force to be moved along at the same acceleration as an object with a small mass.
What is an action force? What is a reaction force?
A - the force applied by one object onto another
R - the equal and opposite force exerted back on the first object by the second
What will happen when object A applies a force to object B?
Object B will give an equal and opposite force to Object A.
What is momentum?
referred to as “oomph” or “bashing power.” It’s related to both its mass (m) and its velocity (v).
How are mass/speed (velocity) & momentum related?
More momentum=more mass/faster velocity
What is a direct relationship? What is an inverse relationship?
DR - as one variable increases, the other also increases
IR - as one variable increases, the other decreases
What are independent and dependent variables? How about controlled varibles?
I - The variable you change. ex. The amount of light a plant needs
D - The variable that depends on what you change/what you measure or observe. ex. Plant growth (how tall the plant gets)
C - These are the variables that you keep the same. ex. soil, planter, type of plant, the surface it’s on, etc.
