### 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

### 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

### The metric acceleration of objects falling near the earth's surface, due to gravity is _________

9.8m/s/s

### 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.

### 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.

### 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.

### 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 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.

larger

### 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

### 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