This is for the Physics final of the first semester of Al-Rowad. Please note that it doesn't include all the info required to do the exam itself.
Force
A push or pull
A forces have a ________
Size and direction
A force can cause an object to change its ______________
Speed and/or direction
When you see a change in an object's motion____________
One or more forces caused the change
Newtons
The unit for force
Contact force
A force exerted during contact
Friction
Example of a contact force
Gravity, magnetic force
Forces that can act from a distance
Net force
The combination of all the forces acting on an object
To determine net force in the same direction
Add the forces together
To determine net force in opposite directions
Subtract the smaller force from the larger force
Balanced forces
When the net force of an object produces 0 N
Balanced forces will NOT
Cause a change in a moving object or cause a nonmoving object to start moving
Unbalanced forces
When the net force of an object DOESN'T produce 0 N
Unbalanced forces produce
A change in an object's motion (Including speed and direction)
Acceleration
The change in motion of a force
Newton's First Law of Motion
An object at rest stays at rest, and an object in motion at the same speed and direction, unless it experiences an unbalanced force.
Newton's First Law of Motion is also called
The Law of Inertia
Inertia
The tendency of all objects to resist a change
An object will not move unless_________
A force makes it move.
When an unbalanced force acts on an object ________
The object accelerates
Newton's Second Law of Motion
The acceleration of an object depends on the mass of the object and the amount of force applied.
Other words for Newton's Second Law of Motion
Objects that have different masses will have different accelerations if the same amount of force is used.
Formula for Newton's Second Law of Motion
Ć’ = m Ă— a
"F" in Newton's Second Law of Motion
Stands for force
"M" in Newton's Second Law of Motion
Stands for mass
"A" in Newton's Second Law of Motion
Stands for acceleration
Newton's Third Law of Motion
Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first.
Other words for Newton's Third Law of Motion
All forces act in pairs
Action force
A force that is applied to an object
Reaction force
A force that acts opposite to an action force
Gravitation
A force pair between different objects
Gravity
Force of attraction between two objects due to their mass
Why is gravity an attractive force?
Earth's gravity pulls everything towards its center.
Acceleration depends on
Force and mass
Why are some planets/moons not spherical?
Because they do not have much mass
What is the equation for the force of gravity?
f = mg
What is the value of "g" in f = mg?
9.81 m/s²
The gravitational force between two objects _______ as the distance between their center ________.
Increases, decreases
Free fall
When gravity is pulling something down and no other forces are acting on it
Orbit
When an object travels around another in space