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Science Chapter 3
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Gravity
Terms in this set (37)
net force
the force on an object is the sum of all forces acting on the object
force
a _______ is needed to make any object move
added
if the forces act in the same direction, the strengths are __________
subtracted
if the forces are moving in opposite directions the strengths are __________
the directions that the forces act
whether you add or subtract depends on the ________________
the same direction as the larger force
when forces are subtracted to find the net force, the directions of the net force is ____________________
is equal to one force on the object, it can be equal
sometimes the net force on an object _____________________
because it allows you to predict how an object's motion will change
why is it important to find the net force of an object?
the net force on the object
what determines an object's motion?
balanced forces
forces that have a net force equal to zero
unbalanced forces
forces that have a net force not equal to zero
objects at rest stay at rest unless acted upon by unbalanced forces
Newton's First Law of Motion 1
objects stay in motion unless acted upon by unbalanced forces
Newton's First Law of Motion 2
describes what happens to an object when the forces on it are balanced
Newton's First Law of Motion 3
if an object is stable, then nothing changed
Newton's First Law of Motion 4
it is a balanced force because there are no forces acting on it.
are the forces on a stationary object balanced? Why or why not?
describes the factors that determine an object's acceleration
Newton's second law of motion
an object's acceleration is equal to the net force on the object divided by its mass
Newton's Second Law of Motion states that...
look at the different relationships between acceleration, force, and mass
to better understand N2LoM...
one factor determines how much an object accelerates is the strength of the net force acting on it.
acceleration and force 1
the greater the net force acting on the object, the greater the acceleration of the object
acceleration and force 2
a factor that affects how much an object accelerates is the object's mass
acceleration and mass 1
if identical net forces act on two objects that have different masses, the object that has the larger mass will have a smaller acceleration
acceleration and mass 2
a = F/m
Newton's 2nd Law of Motion equation
hold the upper and lower parts of a person's body in place during a collision
criteria of Nils Bohlin's solution to safer seatbelts 1
ease of use and comfort
criteria of Nils Bohlin's solution to safer seatbelts 2
is should be easy to make and inexpensive
constraints of Nils Bohlin's solution to safer seatbelts
Nils Bohlin's solution to safer seat belts
what is the three point solution?
describes the three places that the seat belt is secured to the car, which can be done with one hand
three point solution
it represents what Newton's 2nd Law of Motion states
explain a = F/m
engineering design; precisely; problem
an important step in any ____________________ is to _________ state the ________________ to be solved (pt 1)
criteria and constraints; design solution
to do this, engineers describe the ________________ and _____________ of the __________________ (pt 2)
proportional change in acceleration
when mass stays the same, any change in force will result in a _________________________
inverse change in acceleration
when force stays the same, any change in mass will result in an ________________________________
500N it has the greatest net force
for an object with a given mass, which of the following net forces would determine the greatest acceleration? 5N, 50N, or 500N?
200kg because it has less mass
if the forces acting on two objects are the same, which object has a greater acceleration? an object that is 200 kg or 400 kg?
a force that opposed the motion between two surfaces that are touching
friction
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