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.

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

• mass.

• terminal velocity.

• weight.

• free fall.

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

• friction.

• acceleration.

• inertia

• gravity.

The law of universal gravitation states that any two objects in the universe 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

• balanced forces.

• unaffected by gravity.

• substantial.

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The rate at which velocity changes is called

• instantaneous speed.

• acceleration.

• direction.

• motion.

Which of the following is the SI unit of acceleration?

• m/s

• m²/s

• m/s²

• s²/m.

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Which of these is an example of deceleration?

• a bird taking off for flight

• a roller coaster moving down a steep hill

• a safe driver approaching a red light

• an airplane following a straight flight path

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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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