Q1 Exam Physics SG HPS2
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38 Terms
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Velocity
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force pair
The action and reaction pair of forces that occur in an interaction.
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Free Fall
motion under the influence of gravitational pull only
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Interaction
a mutual action between objects where each object exerts an equal and opposite force on the other
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Newton's First Law of motion
An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
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Newton's Second Law of Motion
The acceleration produced by a net force on an object is directly proportional to the net force, is in the same direction as the net force, and is inversely proportional to the mass of the object.
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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 object.
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Terminal Speed
The speed at which the acceleration of a falling object terminates when air resistance balances its weight.
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Terminal Velocity
Terminal speed in a given direction
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force pair
The action and reaction pair of forces that occur in an interaction.
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Free Fall
motion under the influence of gravitational pull only
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Interaction
a mutual action between objects where each object exerts an equal and opposite force on the other
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Scalar quantity
A quantity that can be completely specified by its magnitude
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Acceleration
the rate at which velocity changes with time; the change in velocity may be in magnitude or direction or both. usually measured in units of m/s^2
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Air Resistance
the force of friction acting on an object due to its motion in air
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Equilibrium Rule
the vector sum of forces acting on an object that is not accelerating is 0
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Force
a push or pull
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Free Fall
falling under the influence of gravity only - falling without air resistance
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Friction
the force that opposes motion
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Hang Time
the time that one's feet are off the ground during a vertical jump
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Inertia
the property by which objects resist changes in motion
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Kilogram
unit of mass. one kg is the mass of 1 L of water at 3^0 c
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Mass
the quantity of matter in an object. more specifically a measure of the inertia that an object exhibits
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Net Force
The combination of all forces acting on an object
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Newton
SI unit of force
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Support Force
the upward force that balances the weight of an object on a surface
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Speed
The distance an object travels per unit of time
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Vector quantity
a quantity that has both magnitude and direction
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vector
an arrow that represents the magnitude and direction of a quantity
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Velocity
The speed of an object and specification of its direction of motion
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Volume
the quantity of space an object occupies
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weight
How hard you push on a support force
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dynamic equilibrium
equilibrium when you are moving
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What will help you answer the most questions on the exam?
Zero net force = Equilibrium = Zero Acceleration = Constant velocity (can be zero/ at rest)
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are satilites in equilibrium?
No because they are constantly turning.
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Why do all freely falling objects accelerate at 9m/s/s?
Because they all have the same mass to weight ratio.
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What do we measure weight in?
Newtons
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What do we measure mass in?
Kilograms