# Science - Chapter 2 Forces

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### The greater the mass of an object

the greater its inertia

weight

friction

### The law of universal gravitation states that any two objects in the universe that have mass, without exception,

attract each other

### Forces can be added together only if they are

acting on the same object

### According to the law of conservation of momentum, when two objects collide in the absence of outside forces

the objects have the same momentum before and after they collide

### Any force that causes an object to move in a circle is called a(n)

centripetal force

velocity

### According to Newton's third law of motion, when a hammer strikes and exerts force on a nail, the nail

exerts an equal and oppostie force on the hammer

force

### Which of the following is an example of increasing friction intentionally?

throwing sand on an icy driveway

weight

mass

gravity

inertia

momentum

### How can you increase the momentum of an object?

by increasing its mass

### The total momentum of a group of objects is conserved unless

outside forces act on the objects

satellite

### When the only force acting on a falling object is AIR RESISTANCE, the object is said to be in free fall. T or F

F - when the only force acting on a falling object is GRAVITY

True

F - ACCELERATION

True

DISTANCE

Net force

Newton

Mass

opposite

orbit

fluid

opposite

increases

mass

inertia

opposite

direction

friction

satellite

Example: