Forces (7th Grade Science)

Which of the following is an example of exerting a force?

• • a child running through a field

• • a carpenter hammering a nail

• • a train speeding down a track

What happens when two forces act in the same direction?

• They cancel each other out.

• They add together.  

• Their sum divided by two is the total force.

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The tendency of an object to resist change in its motion is known as

• inertia

• force

• balance

The greater the mass of an object,

• • the easier the object starts moving.     

• the greater its inertia.

  •        

• • the more balanced it is.         

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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

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One way to increase acceleration is by

• • increasing mass.

• decreasing mass. 

• increasing both force and mass proportionally.

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

• friction.

• acceleration.

• gravity.

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Which of the following is an example of rolling friction?

• bike tires on the road as you ride  

• a boat on the water as it sails  

• two hands rubbing together

When the ONLY force acting on a falling object is gravity, the object is said to be

• decelerating.

• free fall.

• a projectile.

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Air resistance is a type of

• friction.

• velocity.

• motion.

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