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44 Cards in this Set
- Front
- Back
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What is Newton's 1st law of motion?
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Object in motion will stay in motion and an object at rest will stay at rest unless acted on by an unbalanced force
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What is inertia?
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the tendency of an object to resist a change in motion
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If there is more mass, is it easier or harder to stop and start?
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it is harder
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If there is less mass, is it easier or harder to stop and start?
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it is easier
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What is the 2nd law of motion?
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force=mass*acceleration
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The higher the mass, the lower or higher the acceleration?
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the lower
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The lower the mass, the lower or higher the acceleration?
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the higher
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What is the relationship between force and acceleration?
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the higher the force=the faster the acceleration
the lower the force=the slower the acceleration |
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How do you get a balanced force?
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when forces are added together working on the same object
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True or False, the size of the forces on the first object equals the size of the forces on the second object
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true
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Is the direction of the force on the first object, opposite or the same as the second object?
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object
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Who are the three scientists that made up laws?
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Aristotle
Galileo Newton |
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What is gravity?
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the force that pulls objects to Earth
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What is free-fall?
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when the only force acting on an object is gravity
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What is the rate of acceleration?
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9.8m/s/s or 21.9mi/hr/s
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Why does gravity oull all objects to earth at the same rate but objects don't fall at the same rate.
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because of air resistance
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What is air resistance?
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fluid friction experienced by falling objects?
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What is air resistance made up of?
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surface area and mass
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What is terminal velocity?
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the maximum velocity a falling object can achieve
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True or false, As objects speed up, air resistance increases
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True
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What is air resistance?
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fluid friction experienced by falling objects
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What are examples of sliding friction?
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brakes, walking, tires, erasing board
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What are examples of rolling friction?
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wheels. ball bearings, bowling
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What are examples of fluid friction?
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motor oil, skiing, snow sports
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WHen the force of air resistance+the force of gravity, object stops accelerating. when is this
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120 mph
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If there is a greater surface area, is there more air resistance?
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true
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What is Universal Gravitation?
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that the force of gravity acts between all objects in the universe
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What does gravitation force depend on?
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mass and distance
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What is the relationship for gravitational pulling?
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more mass-more gravitational pull
closer together-more gravitatinal pull |
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What is stage 3?
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terminal velocity - force of gravity pulliing down is equal to the force of the air resistance pushing up-= balanced force - no acceleratin
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What is stage 4?
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open parachute - force of air resistance pushing increases larger than force of gravity pulling down - unbalanced force - slowing down
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What is stage 5?
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gliding to earth - as person slows air resistance decreases and is equal to the force of gravity - balanced force no acceleration
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What is stage 6?
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landing - when person hits the ground the ground supplies a great upward force - balanced force-stops motion
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What is the relationship between speed and acceleration?
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speeding up- acceleration force is greater than resisting force
slowing down- accelerating force is weaker than resisting force constant speed-accelerating forceis equal to resisting force |
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What is stage 1?
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stage 1- in the plane balanced force - no acceleration force off plane pushing up is equal to the force of gravity pulling person down
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What is stage 2?
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Stage 2
- leaving plane,force of gravity is greater than air resistance pushing up on the person - unbalanced force , accelerationg downward |
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What is friction?
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the force that one object exerts onanother when the two objecsts rub up against eachotehr
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What are the results of friction?
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heat, slowing down, speeding up, resist motion
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What are the three types of friction?
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sliding friction
fluid friction rolling friction |
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What is sliding friciton?
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occurs when two solid surfaces slie over eachother, it exerts the most frcictional forces
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What is fluid friction?
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occurs when an object moves through fluid (liquid and gases) exerts less force than sliding friction
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What is rolling friction?
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aopccurs when an onbject rolls over annother object, exerts much lesss force than sliding friction-least frictional forces
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What are the factors that affect friction?
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surface texture (smooth/rough)
Rougher objects exert more force than smooth objects surface pressure (mass) Heavier objects push down harder than lighter objects |
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What is the 3rd law of motion?
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For every action there is an equal but opposite reaction
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