Forces
define force
push or pull on an object
define gravity
force of attraction
define motion
change in an objects position over time
the ability to move matter or change matter in some other way.
energy
bungee jumping is an example of
elastic force
Weight measures the force of gravity pulling downward on an object. The SI unit for weight, like other forces, is
the newton
the law of motion states that an object at rest will remain at rest and an object in motion will stay in motion unless it is acted on by an unbalanced force
newtons 1st law
where do humans get energy from
food they eat
what is a force that opposes motion between any surfaces that are touching
friction
Newton’s law of universal gravitation states that the force of gravity affects everything with
mass
movement of an object in a curved path toward the ground because it has both a horizontal force and the downward force of gravity acting on it.
projectile motion
The SI unit for both work and energy is the
joule
can you name 1 of the 4 types of friction
static, sliding, rolling, or fluid
Albert Einstein came up with a theory of gravity that actually explains gravity rather than simply describing its effects. Einstein showed this
mathematically
the motion of the earth and other bodies around the sun
orbital motion
when a boy swings a tennis racket, the energy of the moving racket is an example of
mechanical energy
If two forces act on an object in the same direction, the net force is equal to
the sum of 2 forces
Einstein showed mathematically that gravity is not really a force of attraction between all objects with mass, as Newton thought. Instead, gravity is a result of the warping of
space-time
how do you use newtons first law to get a skateboard rolling
push foot against ground
the energy of moving matter is called
kinetic energy