ScienceFusion: Forces and Motion: Chapter 1 Lessons 3 & 4
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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.
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41 Terms
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Force
A push or pull
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A forces have a ________
Size and direction
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A force can cause an object to change its ______________
Speed and/or direction
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When you see a change in an object's motion____________
One or more forces caused the change
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Newtons
The unit for force
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Contact force
A force exerted during contact
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Friction
Example of a contact force
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Gravity, magnetic force
Forces that can act from a distance
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Net force
The combination of all the forces acting on an object
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To determine net force in the same direction
Add the forces together
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To determine net force in opposite directions
Subtract the smaller force from the larger force
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Balanced forces
When the net force of an object produces 0 N
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Balanced forces will NOT
Cause a change in a moving object or cause a nonmoving object to start moving
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Unbalanced forces
When the net force of an object DOESN'T produce 0 N
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Unbalanced forces produce
A change in an object's motion (Including speed and direction)
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Acceleration
The change in motion of a force
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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.
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Newton's First Law of Motion is also called
The Law of Inertia
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Inertia
The tendency of all objects to resist a change
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An object will not move unless_________
A force makes it move.
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When an unbalanced force acts on an object ________
The object accelerates
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Newton's Second Law of Motion
The acceleration of an object depends on the mass of the object and the amount of force applied.
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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.
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Formula for Newton's Second Law of Motion
ƒ = m × a
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"F" in Newton's Second Law of Motion
Stands for force
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"M" in Newton's Second Law of Motion
Stands for mass
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"A" in Newton's Second Law of Motion
Stands for acceleration
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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.
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Other words for Newton's Third Law of Motion
All forces act in pairs
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Action force
A force that is applied to an object
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Reaction force
A force that acts opposite to an action force
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Gravitation
A force pair between different objects
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Gravity
Force of attraction between two objects due to their mass
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Why is gravity an attractive force?
Earth's gravity pulls everything towards its center.
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Acceleration depends on
Force and mass
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Why are some planets/moons not spherical?
Because they do not have much mass
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What is the equation for the force of gravity?
f = mg
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What is the value of "g" in f = mg?
9.81 m/s²
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The gravitational force between two objects _______ as the distance between their center ________.
Increases, decreases
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Free fall
When gravity is pulling something down and no other forces are acting on it
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Orbit
When an object travels around another in space
Note 
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