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# Force, Mass, Weight

What is gravity? Force of attraction between objects due to their masses
All objects in the universe attract each other through gravitational force. What is this called? Law of universal gravitation
What does the size of the gravitational force between objects depend on? mass of the objects and distance between the objects
What is the acceleration of an object due to gravity? 9.8m/s/s
What does an object have when it is falling at a constant velocity? terminal velocity
What is Newton's first law of motion? An object at rest remains at rest and an object in motion remains in motion at a constant speed and in a straight line unless acted on by an unbalanced force.
What is Newton's second law of motion? The acceleration of an object depends on the mass of the object and the amount of force applied.
What is fluid friction that opposes the motion of falling objects? air resistance
What is mass? The amount of matter in an object
What is the measure of the gravitational force on an object? weight
What is net force? the force that results from combining all the forces exerted on an object
What metric unit is used to express force? newton
What is the formula for acceleration? A = V₂ - V₁ / T
∆v = g • t is the formula for _______________. final velocity of a falling object
Newton's first law is sometimes called the law of________________. inertia
What is inertia? The tendency of all objects to resist any change in motion.
What is the formula for force? F = m • a
What is the formula for speed? S = D / T
What force is necessary to produce a change in motion or cause a non-moving object to move? unbalanced force
What are balanced forces? forces on an object that cause the net force to be zero - no change in motion
How are force and weight related? gravity is a force and weight is the measure of gravity
What does this symbol (∆v) mean? change in velocity
What is Newton's third law? Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first
All forces act in ________________. pairs
What are the 3 forms of acceleration? speeding up, slowing down, and changing direction
Can a moving object have balanced forces? yes, it can be moving at a constant speed in a straight line
What is the common metric unit used for acceleration? m/s/s or m/s2
What is the common metric unit used when referring to the velocity of a falling object? m/s
What instrument is used for measuring weight? a spring scale
What instrument is used for measuring mass? a triple beam balance
What metric and English units are used for measuring weight? Metric - Newton, English - Pounds
Are mass and weight the same thing? No - mass never changes and weight changes with gravitational changes
What is a vacuum? a space with no air
What is free fall? When the only force acting on a falling object is gravity
Where does free fall occur? only in space or in a vacuum
Why do astronauts seem to float around in their space shuttle? because of the combination of their forward motion & falling motion toward the Earth, they have the effect of "zero gravity"
What is the moon's gravity? 1.6 m/s/s
What is a force that opposes motion? friction
What are the four types of friction? sliding, rolling, fluid, and static
The mass of object A is 4.5kg and the mass of object B is 6kg. If the same force is applied, which object will have greater acceleration? Object A
Created by: lcollette

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