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36 Cards in this Set
- Front
- Back
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Displacement is |
distance combined with direction |
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slope of the distance-time graph is equal to |
speed |
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Acceleration is equal to |
change in speed divided by time. |
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Momentum is NOT |
A force |
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What force besides gravity acts on a projectile? |
Air resistance |
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Newton’s second law |
a = F/m |
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A resting object exerts pressure equal to |
its weight divided by its contact area. |
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water pressure on swimmer depends on |
how deep you are in the water |
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Bernoulli’s principle is |
As a fluid’s speed increases, the pressure within it decreases. When a moving fluid slows, the pressure within it increases. It helps explain the lift of an airplane. |
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Work is the product of |
force and distance. |
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Power is equal to |
Work divided by time |
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work output of a machine |
Always less than work input |
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example of an object having elastic potential energy |
Stretched string |
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Mechanical energy is |
the sum of the kinetic and potential energy of an object. |
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The law of conservation of energy states |
energy cannot be created or destroyed. |
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To heat 1 g of water by 1° C requires |
1 Calorie |
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All engines operate at less than 100 percent efficiency because |
They emit heat |
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A blow dryer transfers thermal energy mainly by |
convection. |
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mechanical waves |
Carry energy, can be longitudinal, require a medium |
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Amplitude is |
The height of a wave crest |
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diffraction is |
when a wave bends around an obstacle |
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Electromagnetic waves |
can travel through empty space. |
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Polarized light |
vibrates in only one direction |
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A green object reflects/absorbs what color |
Reflects green light |
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Static electricity |
The study of buildup of charge, electric discharges, and electric fields |
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a Conductor is |
material that easily carries a current |
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Ohm’s law states |
Voltage equals current times resistance |
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If you cut a magnet in half, you have |
two magnets |
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An electric generator converts |
mechanical energy into electrical energy |
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An iron bar is placed in a solenoid to |
increase the magnetic field strength |
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Most of the mass of the solar system is contained in |
the sun |
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All the terrestrial planets have |
rocky surfaces |
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accretion is |
The process by which planetesimals combine with other planetesimals |
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The sun produces most of its energy from |
nuclear fusion |
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Astronomers have learned about elements in stars by analyzing their |
absorption lines. |
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The lifetime of a star on the main sequence is determined by |
Its surface temperature |
