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34 Cards in this Set
- Front
- Back
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According to the law of conservation of momentum....... |
when two objects collide in the absence of friction, momentum is not lost. |
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Changing direction is an example of.... |
acceleration |
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Momentum can be calculated by.... |
multiplying an object's mass and velocity |
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A reference point is... |
a place or object used for comparison to determine if something is in motion |
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Force can be defined as |
a push or pull |
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If you know the distance an object has traveled in a certain amount of time, |
you can determine the speed of the object |
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On a graph showing distance versus time, |
a horizontal line represents an object that is not moving at all |
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When an object’s distance from another object is changing, |
it is in motion. |
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A Newton is
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the SI unit for force |
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If an object moves in the same direction and at a constant speed for 4 hours |
the object’s velocity did not change |
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Speed equals |
distance divided by time |
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Acceleration is |
the rate at which velocity changes. |
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The greater the mass of an object, |
the greater its inertia. |
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If a bicyclist travels 30 kilometers in two hours, what is her average speed? |
15 km/h |
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You can show the motion of an object on a line graph in which you plot |
distance against time |
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Friction |
the force that one surface exerts on another when the two rub against each other |
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You can increase the momentum of an object by |
increasing its mass |
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What does it mean if an object is traveling at a constant speed? |
The speed does NOT change over time. |
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You can increase acceleration by |
decreasing mass. |
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According to Newton’s third law of motion, |
when a hammer strikes and exerts force on a nail, the nail exerts an equal force back on the hammer |
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Inertia is |
the tendency of an object to resist change in its motion |
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When you know both the speed and direction of an object’s motion |
you know the velocity of the object |
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When two forces act in the same direction |
they add together. |
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The steepness of a line on a graph is called the |
slope |
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Newton’s Third Law of Motion |
explains how a rocket lifts off the ground and into space |
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Average speed is |
the total distance traveled divided by the total time |
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The momentum of an object is in the same direction as its |
velocity |
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Energy |
is defined as the ability to do work. |
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The energy associated with motion is called |
kinetic energy. |
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Mechanical Energy |
the total potential and kinetic energy associated with the position and motion of an object |
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You use friction to convert mechanical energy into thermal energy |
when you rub your hands together on a cold day |
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Gravitational Potential Energy |
is potential energy that depends on height |
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Visible light is an example of |
electromagnetic energy |
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The law of conservation of energy states that |
when one form of energy is converted into another, no energy is destroyed in the process. |
