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NCFE Science - 7P

NCFE review - 7P

QuestionAnswer
The motion of an object is always judged according to what? a reference point
Motion can be described with a reference direction. Give 4 examples of a reference direction. North, South, East, West, Up, Down
What can change the direction and speed of an object? an unbalanced force
What is all motion relative to? ts frame of reference
Friction depends on two factors. What are the two factors? roughness and pressure
A force will not start moving unless what acts upon it . unbalanced force
Friction is a force that opposes motion, true or false. true
An object will stay in motion forever unless a what acts on it. unbalanced force
What is the tendency of an object to resist change? inertia
Mechanical energy can be either _____ energy or _____energy Potential, Kinetic
Energy in motion is what type of energy? Kinetic
Energy of position is what type of energy? Potential
What can an object do if it has mechanical energy? Work
When riding a skateboard ramp, when is potential energy the highest? Top of ramp
When riding a skateboard ramp, when is kinetic energy the highest? Bottom of ramp
What type of energy comes from a light bulb? Light and Heat
What type of energy comes from a can of gasoline? Chemical
What type of energy is occurring on the sun? Nuclear and Heat
What type of energy comes from the sun? Radiant
What type of energy occurs when two objects push or pull? Mechanical
What type of energy occurs when a warmer object comes into contact with another object. Thermal
When a battery or generator is connected in a complete circuit to an electrical device. Electrical
Can energy changed from one form to another? yes
Can energy be created or destroyed? no
What is some energy is always transformed into? heat
What is the term that describes the work a simple machine actually does. Actual Mechanical Advantage
What is the term that describes the work a simple machine could do under perfect conditions? Ideal Mechanical Advantage
A machine is a device that makes work easier by changing the s______ or _______ of a force. size or direction
Mechanical advantage is the number of times the machine multiplies ________. force
What is the simple machine that has a bar that pivots at a fixed point called a fulcrum? lever
What is the simple machine that over wheel over which a rope, chain, or wire passes. pulley
What is name of the simple machine that consist of two circular objects of different sizes? wheel and axle
The mechanical advantage of the wheel and axle is the radius of the wheel divided by the _________ _ _ ______. radius of the axle
What is the name of the simple machine that consist of a straight slanted surface and facilitates the raising of loads. ramp
What is the name of two or more simple machines. compound machine
Would scissors be considered a compound machine? yes
Would a bicycle be considered a compound machine? yes
Are most machines compound machines? yes
Created by: s.blanchard