7th Grade Science Force and Motion
Key vocab, Newton's 3 Laws of Physics, and more!
Terms in this set (52)
a push or pull; all ****** have both size and direction
the force exerted between magnetic poles, producing magnetization
the force that is released when something is being pulled or compressed
force exerted due to motion of electrons; electrons flow from higher potential to lower and preform work
the upward force the fluids exert on all matter; bouyant force opposes gravitational force
a force that opposes motion between tow surfaces that are touching
a force of attraction between objects that is due to their masses
the rate at which an object moves; ***** depends on the distance traveled and the time taken to travel that distance
the speed of an object in a particular direction
a force that opposes motion between two surfaces that are touching
(N) the SI unit of force
a measure of the gravitional force exerted on an object, usually by the Earth
what causes an object to change motion
what recieves the impact of force
a force in which the agent does not directly have come in contact with the receiver
a force in which the agent doesn't have to come in contact with the receiver
when two equal but opposite forces act on an object, the object stays stationary
when two unequal and opposite forces act on an obect , the object moves in the direction of the greater force
All vector diagrams must have:
Direction of Force
Result of force
the force that results from combining all the forces exerted on an object
law of universal gravitation
the law that states that all objects in the universe attract each other through gravitational force
is a ratio of the distance traveled to the time it took to travel that distance
What is force measured in?
the amount of matter in an object; stays the same no matter where in the universe you measure it (measured in a double pan balence).
property of a moving object that depends on the object's mass and velocity; NOT A FORCE
M*******=Mass times velocity/speed
an object at rest or in motion will stay at rest or in motion unless acted upon by another force
Newton's 1st Law
Every object in a state of uniform tends to remain in a state of motion unless an eternal force is applied
To Sum it All Up: INERTIA
Newton's 2nd Law
The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma. Acceleration and force are vectors (as indicated by their symbols being displayed in slant bold font); in this law the direction of the force vector is the same as the direction of the acceleration vector.
Newton's 3rd Law
For every action there is an equal and opposite reaction.
To Sum it Up: For every agent there is a reciever.
a substance capable of reducing friction by making surfaces smooth or slippery
Ex: water, oil, grease, slime
forces that push or pull using direct contact with one another. Ex: you pushing your chair in after you get up (push of hand)
forces that push or pull without needing direct contact. Ex: when you rub a balloon on your hair then hold it by your head and your hair sticks up (static force)
double pan balance
A double-pan balance is a scale which has 2 pans that are balanced against each other. The scale functions like a see-saw, with each of the 2 pans attached to a beam over a centered pivot point.
an increase in speed
pattern, make, regulate, set, measure, or estimate according to some rate or standard
size and direction
- what all forces have
-two things you must take into account to calculate net force
a rate of motion determined by dividing the total distance traveled by the total travel time
Law of Conservation of Momentum
For a collision occurring between object 1 and object 2 in an isolated system, the total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision. That is, the momentum lost by object 1 is equal to the momentum gained by object 2.
the formula of force
MASS x ACCELERATION = FORCE!
action/ reaction forces
forces always act in pairs, action forces being the "start"/cause/agent and the reaction forces being the "end/effect/reciever.
variables that affect friction
-type of surface
-wheels or no wheels
-mass/weight of object
-if there are any fluids on the upcoming surface
variables that do NOT affect friction
-color of object
-length of object
-amount of newtons
varibles that affect accleration
-amount of mass the object has
-force that moved the object
-surface of the object
the property created by the space between two objects or points
the amount of matter in a given space; mass per unit volume
requires little force; MUST HAVE WHEELS!
very hard to move; requires lot of force; THE HARDEST PART OF PUSHING!
Ex: sledding, brakes, writing with a piece of chalk
opposes the motion of objects traveling through fluids; MUST HAVE FLUIDS!
Ex: swimming,slipping on water, wiping spilt milk
the friction you feel when starting to push something; THE FRICTION THAT KEEPS OBJECTS IN PLACE
the condition of having been made smooth or slippery by the appliacation of a lubricant
the effects of inertia and rotation; the circular motion causes constant acceleration
FICTITIOUS FORCE; NOT A REAL FORCE
An apparent force that acts outward on a body moving around a center, arising from body's inertia