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33 Cards in this Set
- Front
- Back
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___________ is a measure that does not change when an object's location changes.
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Mass
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3 Ways to reduce friction.
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Put on a lubricant, put wheels on it, and or smooth the surface of the object.
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Speed of an object in a particular direction is it's _____________________.
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Velocity
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A push or pull that always acts on an object is a(n)
_____________. |
Force
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_____________ is the force of attraction between two objects.
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Gravity
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_________________ is a force that always acts to oppose motion.
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Friction
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What unit does distance use?
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Meters
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_____________________ is the change in a moving object's speed or direction or both.
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Acceleration
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______________ is the measure of gravitational force exerted on an object.
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Weight
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What is the formula for speed?
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S= distance/time
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If you are running and you never slow down or speed up, you are running at a ______________ pace.
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Constant
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What happens to your body as it enters space?
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Your mass stays the same but your weight decreases.
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What unit does work use?
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Joules
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What unit does force use?
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Newtons
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What is the formula for work?
What is the unit? |
W= force x distance
Joules |
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What unit does power use?
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Watts
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Newton's first Law of Motion.
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An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
This law is often called"the law of inertia". |
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What is the formula for distance?
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D= speed x time
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Newtons second Law of Motion.
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Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object). Simplified: You have to use more work to push or pull a bigger object with more mass.
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Newtons third Law of Motion.
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For every action there is an equal and opposite re-action.
Ex: A rocket blasting off. Fire is the action, going up into the air is the reaction. |
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The comparison of a machine's work output with work input is ____________________ _______________________.
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Mechanical Efficiency
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_____________________ is an objects change in position relative to a reference point.
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Displacement
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What is the formula for power?
What is the unit? |
P= work/time
Watts |
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What is the formula for mechanical advantage?
What is the unit? |
MA= output force / input force
There is no unit |
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_____________________ ____________________ is the number of time a machine multiplies work.
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Mechanical Advantage
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Has grooved wheel and cable.
( machine ) |
Pulley
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What is the formula for force?
What is the unit? |
F= work/ distance
Newtons |
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The rate at which work is done or energy is transformed is ______________.
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Power
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What is the formula for acceleration?
What is the unit? |
A= final velocity - initial velocity / time
The unit depends but it is always squared. Ex: If the answer was 6 then it would be 6 m/s2 REMEMBER the unit varies but it is always squared |
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Has two circular devices of different sizes.
( machine ) |
Wheel and axle
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Bar that pivots on a fixed point.
( machine ) |
Lever
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A machine made of two or more simple machines is called a(n) __________________ ____________________.
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Compound Machine
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_______________ is the transfer of energy that causes an object to move in the direction of the force.
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Work
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