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a contact force; type of force between two touching surfaces
_______ is the property of an object that leads it to resist any change in motion
Equal forces acting on an object in opposite directions
force acting on an object that causes a change
materials that reduce friction
Acceleration depends on the
(physics) the force of attraction between all masses in the universe
First Law of Motion
An object at rest or in motion will remain at rest or in motion unless acted upon by an unbalanced force.
Newton's second law
Acceleration is produced when a force acts on a mass, the greater the mass, the more force is required to accelerate the object.
Tools that make work easier.
6 Simple Machines
lever, pulley, screw, wheel and axle, inclined plane, wedge
A simple machine that is an inclined plane with one or two sloping sides.
wheel and axle
A rod attached to a wheel. It makes it easier to move or turn things.
A simple machine that is an inclined plane wrapped around a central cylinder to form a spiral
a grooved wheel with a rope running along the groove
A combination of two or more simple machines.
A flat surface set at an angle or an incline with no moving parts that is able to lift objects by pushing or pulling the load.
a rigid bar or board that is free to move around a fixed point called a fulcrum
friction caused by moving two flat surfaces against each other
Friction that occurs when an object rolls over a surface
a type of friction that occurs when a solid object moves through a gas or liquid
An object is moving if its position relative to a fixed point is changing.
(physics) a rate of change of velocity
A _______ is a place or object used for comparison to determine if something is in motion.
(physics) the rate of doing work
a running dog
a speed in a particular direction.
Magnitude of instantaneous velocity