Forces

The greater the mass of an object,

• the more balanced it is

• the more space it takes up

• the easier the object starts moving

• the greater its inertia

Forces can be added together only if they are

• substantial

• acting in the same object

• balanced forces

• unaffected by gravity

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

• repel each other

• create friction

• combine to provide a balanced force

• attract each other

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

• balanced force

• unbalanced force

• gravitational force

• centripetal force

The force of gravity on a person or object on the surface of a planet is called

• terminal velocity

• mass

• free fall

• weight

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

• velocity decreases

• the objects have more momentum after they collide than they did before

• velocity increases

• the objects have the same momentum before and after they collide

What happens when two forces act in the same direction?

• They cancel each other out

• Their strengths are added

• The stronger one prevails

• Their sum divided by two is the total force

The momentum of an object is in the same direction as its

• force

• acceleration

• intertia

• velocity

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

• moves at a constant speed

• disappears into the wood

• creates a friction with the hammer

• exerts an equal and opposite force on the hammer

The force that one surface exerts on another when the two rub against each other is called

• inertia

• gravity

• acceleration

• friction