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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

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