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44 Cards in this Set

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

surface pressure (mass)
Heavier objects push down harder than lighter objects
What is the 3rd law of motion?
For every action there is an equal but opposite reaction