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23 Cards in this Set
- Front
- Back
What do we call the tendency of matter to stay at rest if it is at rest or to continue moving at a constant velocity if it is in motion?
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inertia
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What is defined as the change in velocity over a period of time?
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acceleration
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What do we call the attraction that allows molecules of chalk to stick to one another?
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cohesion
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What is the measurement of the pull of gravity upon an object?
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weight
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Which state of matter has a definite shape and occupies a definite amount of space?
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a solid
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T or F- Newton's first law of motion states that the velocity of an object does not change unless the object is acted upon by a motor.
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False- by an outside force
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T or F- Newton's second law of motion states that the acceleration of an object is directly related to the strength of the force and inversely related to the object's mass.
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True
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T or F- Newton's third law of motion states that for every action, there is an equal and opposite condition.
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False- there is an equal and opposite reaction
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T or F- Pressure is the resistance caused by moving one object against another.
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False- friction
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T or F- Acceleration is a change in velocity over a period of time.
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True
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T or F- The rate of doing work is called force
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False- it is called power
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T or F- In third-class levers, the input and output forces are on either side of the fulcrum.
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False- They are on the same side as the fulcrum.
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T or F- The joule is the metric unit of work and energy.
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True
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T or F- The force we apply to a machine is called the work.
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False- it is called the effort
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T or F- The total of the mass and energy of the universe always remains the same.
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True
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T or F- The force machines help us to overcome is called friction.
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False- it is called resistance
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T or F- Effort force tells us the number of times a machine multiplies our effort.
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False- mechanical advantage tells us the number of times a machine multiplies our effort.
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What are the three basic forms of matter?
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solid, liquid and gas
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How does weight differ from mass?
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Mass is the amount of matter in an object.
Weight is a measurement of the pull of gravity on an object. |
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What two things does velocity tell us about motion?
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speed and direction
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What two forms of energy can mechanical energy be classified as?
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kinetic and potential
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What can be identified as the ability to do work in the scientific sense?
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energy
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What are devices called, that do work and multiply muscle power enabling them to complete tasks?
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machines
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