Chapter 10: Forces and Motion

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.
• 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.
• direction.
• acceleration.
• motion.

Which of the following is the SI unit of acceleration?

• m/s
• m/s2
• m2/s
• s2/m

Which of these is an example of deceleration?

• a bird taking off for flight
• a roller coaster moving down a steep hill
• a car approaching a red light
• an airplane following a straight flight path

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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