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### Study for Physics test for science

What determines change in position? reference point
What is force? a push or pull
What can force do to an object? give energy cause movement change position
How is force measured? Newtons (N) Force=kg x m/s2
How do forces occur? in pairs balanced or unbalanced
Balanced forces are . . . equal in size opposite in direction don't cause a change in position
Unbalanced forces cause . . . change in motion
Unbalanced forces are . . . unequal in size not opposite can be opposite or same direction
Gravity is . . . the force with which the Earth, moon, and other large objects pull other objects towards itself the weight of an object
What experiences gravity? all objects on Earth gravity is directed "down" towards the center of the Earth
Friction is . . . a resistive force that opposes motion the force exerted from a surface to an object moving, or attempting to move across it
What is air resistance? a frictional force that happens in the air
How does friction occur? when one object comes in contact with another object
What is motion? change in position due to time
What is speed? change of distance with time s=d/t
What is velocity? speed and direction
What is acceleration? change in velocity increase or decrease in speed change in direction
What are simple machines? simple devices that are used for multiplying/changing the direction of forces
Why do you need lines for pulleys? the force needed to raise a load depends on the number of lines to support the pulley
What do they do? make work easier some increase force/distance an object is moved
What is a pulley used for? increase force and/or change direction of force
6 types are . . . lever, wheel and axle, pulley, inclined plane, wedge, screw
What is an inclined plane used for? raise objects with less force
How long did Newton live? 1643-1727
Who was Newton? English physicist mathematician culminating figure of the science revolution of the 1700's
What did he discover/do? optics motion mathematics developed the principles of modern physics
What are the laws of motion? three laws describe how objects move under influence of force
What is Newton's 1st law? law of Inertia an object at rest stays at rest and an object in motion stays in motion at the same speed and direction unless acted upon by an unbalanced force
What is Newton's 2nd law? law of force and acceleration the acceleration of an object is dependent upon two variables-the force acting upon it and the object's mass Force=m x a
What is Newton's 3rd law? law of action-reaction for every action there is an equal and opposite reaction
What is Inertia? an object's tendency to resist change in motion varies with mass
Created by: Megamegs