Term
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Definition
An object at rest will remain at rest,
and an object moving at a constant velocity will continue moving at a constant velocity
unless acted upon by an unbalanced force |
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Term
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Definition
| the tendency to resist change in motion |
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Definition
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Term
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Definition
Acceleration depends on the object's mass
and on the net force acting on the object. |
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Term
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Definition
Acceleration = Net force
Mass |
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Term
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Definition
| Force = Mass x Acceleration |
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Term
| 2 ways to increase acceleration |
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Definition
Decrease mass
or
Increase force |
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Term
What allows a rocket
to lift off? |
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Definition
| Gases expelled exert an equal but opposite reaction force |
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Term
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Definition
an object that orbits
another object |
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Term
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Definition
a force that causes objects to move in a circle
("center seeking") |
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Term
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Definition
velocity is straight forward, but gravity bends the direction
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Term
| Why are satelites falling? |
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Definition
| Satelites are falling, but because the earth is round, the satelites continually fall around the curved earth. |
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Term
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Definition
| 1 N = the force required to give a 1-kg mass an acceleration of 1 m/s2 |
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Term
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Definition
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Term
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Definition
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Term
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Definition
the combination of all forces acting on an object at one time
(determines movement) |
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Term
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Definition
| cause a change in movement (start or stop, faster or slower, or change in direction) |
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Term
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Definition
result in no change in motion;
cancel out |
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Term
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Definition
| the force of 2 surfaces on each other |
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Term
| Friction depends on what 2 factors? |
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Definition
the type of surface (rough or smooth)
and how hard the surfaces are pushed together |
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Term
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Definition
| The friction force that makes it hard to get things to start o move |
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Term
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Definition
| 2 surfaces sliding together |
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Term
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Definition
ball bearings
(easy to overcome) |
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Term
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Definition
| the force on an object moving through a fluid such as air, water, or oil |
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Term
| Force arrows can show what two things? |
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Definition
| strength and direction of a force |
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Term
| How can arrows show net force? |
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Definition
| Forces in the same direction add together. Forces in opposite directions subtract to form a net force |
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Term
| What happens to a moving object that has no friction? |
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Definition
It keeps moving forever
or until it encounters a force that changes its motion |
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Term
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Definition
| a force that pulls (all) objects toward each other |
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Term
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Definition
rate of acceleration due to gravity on all objects
(no matter what mass) |
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Term
| Universal Law of Gravitation |
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Definition
| The the force of gravity that exists between ALL objects |
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Term
| Factors affecting gravity |
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Definition
| Mass of the objects and their distance apart |
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Term
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Definition
| the amount of matter in an object |
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Term
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Definition
| A measure of the amount of gravitational force on an object |
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Term
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Definition
| when the only force acting on an object is gravity |
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Term
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Definition
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Term
| In what direction is friction? |
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Definition
| In the opposite direction of the motion of the object |
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Term
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Definition
| Reached when air resistance equals the weight of an object. It then accelerates no further, keeping the same speed |
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Term
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Definition
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Term
| In no air (a vacuum) how do objects of different sizes or masses accelerate due to gravity. |
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Definition
at the same rate
(They hit ground at the same time) |
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Term
| In air, how do objects of different sizes accelerate due to gravity? |
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Definition
More surface area (larger object) slows acceleration.
These objects will hit the ground at different times in air. |
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Term
| If one object is dropped and, at the same exact time, another identical object is thrown, which object will reach the ground first? |
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Definition
| They will reach the ground at the same time. |
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