Physical Science: Forces

In physical science, a push or a pull is called a(n)

• force.

• acceleration.

• inertia.

• motion.

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The amount of matter in an object is called its

• force.

• balance.

• inertia.

• mass.

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

• waxing skis

• adding grease to gears on a bike

• throwing sand on an icy driveway

• oiling a squeaky door

Which of the following is an example of rolling friction?

• between your shoes and the sidewalk as you walk

• between your bike tires and the road as you ride

• between a boat and the water as it sails

• between two hands being rubbed together

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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The force of gravity on a person or object at the surface of a planet is known as

• mass.

• inertia.

• air resistance.

• weight.

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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.

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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 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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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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