44 terms

Science 8 grade newtons law of motion

What was Galileo trying to prove when he dropped a cannon ball and a musket ball from the leaning tower of pisa?
the mass will not effect acceleration from gravity
the attraction of all objects to he earth is callled?
According to the universal law of Gravitation, which objects can exert a gravitational pull?
all objects
Gravitational force_________ as mass increases. So a massive truck would have a _______ gravitational force than a small car.
increase, greater
gravitational force decreases as the distance ________
The metric acceleration of objects falling near the earth's surface, due to gravity is _________
The acceleration is the ______ same for all objects falling to earth regardless of their mass.
If all objects fall long enough, they can eventually stop accelerating, and reach their _________. So the force of gravity becomes _______ to the force of air resistance stopping the acceleration of the object.
terminal velocity, equal
__________ occurs between the surface of a falling object and the air that surrounds it. So it goes against (opposes) the motion of objects through air.
air resistance
When a flat piece of paper and a crumpled piece of paper are let go at he same time, which lands first?
The crumpled paper because there is less surface.
Free fall is _________________________
When gravity is the only force acting on it.
Free fall makes astronauts appear to be _____ or _______ in space.
floating, weightless
Newton's First law of Motion states
an object at rest remains at rest, and an object in motion at a constant speed and in a straight line unless acted on by an unbalanced force.
Anothername for Newtons firs law is called
Three examples of Newtons First law of motion are
a plane parked on a runway. a chair on the floor. a golf ball balanced on a tee.
newtons second law of motion states
the acceleration of an object depends on the mass of the object and the amount of force applied.
one examples of Newtons second law of motion are
heavy cart takes more time to accelerate.
newtons third law of motion states that
whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first.
three examples of the third law of motion are
a baseball hit by a bat, when you hit your hand on the table, when a rocket blasts off.
momentum is
a property of a moving object that depends on the object's mass and velocity.
momentum is calculated by multiply the mass of an objects ____________________
m=mass times velocity
the _________ momentum an object has, the harder it is to stop the object or change its direction. So a massive truck has a greater momentum and would be harder to stop than a smaller car.
A fast moving car would have _________ momentum than a slow moving car.
projectile motion is __________________________
the curved path an object follows when thrown or propelled near the surface of the earth.
two examples of a projectile motion are....
a swimmer diving into water. an athlete doing a high jump
centripetal force is
an object travelling in a circle is constantly changing directions, so acceleration occurs continuously
Inertia is
the tendency of an object to resist any change in its motion
motion is
newton is famous for these laws
gravity is
acceleration of a falling object is caused by this force
any change in velocity
air resistance
the friction that slows down the motion of objects in air
weightless is
when in free fall, astronauts appear this way
projectile motion
the curved path traveled by a thrown baseball is known as this.
free fall is
when gravity is the only force acting on an object
centripedal force
is a unbalanced force that causes an object to move in a circular path.
terminal velocity
reached when the downward force of gravity equals the force of air resistance
this motion depends on mass and velocity
a response to an action
perpendicular to the ground
parallel to the ground
doing something
law of inertia is which law.. A. 1st law B. 2nd law C. 3rd law
A.1st law
Tells what happens when one object exerts a force on a second object is which law... A. 1st law B. 2nd law C. 3rd law
C. 3rd law
Force= mass x acceleration
B. 2nd law