Physics Praxis

What happens when two forces act in the same direction?

• They cancel each other out.

• The stronger one prevails.

• Their strengths are added.

• Their sum divided by two is the total force.

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The greater the mass of an object,

• the easier the object starts moving.

• the greater its inertia.

• the more balanced it is.

• the more space it takes up.

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

• mass.

• weight.

• terminal velocity

• free fall.

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

a. c.

b.. d. .

• friction.

• inertia.

• acceleration

• gravity

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

• attract each other.

• repel each other.

• combine to provide a balanced force.

• create friction

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Forces can be added together only if they are

• acting on the same object

• unaffected by gravity

• balanced forces

• substantial

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

• velocity decreases

• velocity increases

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

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

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

• balanced force

• gravitational force.

• unbalanced force

• centripetal force

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

• force.

• velocity.

• acceleration.

• inertia.

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

• creates a friction with the hammer.

• disappears into the wood.

• exerts an equal and opposite force on the hammer.

• moves at a constant speed.

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