Force and Motion Vocabulary

Three boats were moving across the surface of a lake. The gray and pink boats are a greater mass than the orange boat. Each boat was bumped by another boat. Which boat experienced the strongest force when hit? How do you know?

• The gray and pink boats because they are more massive, and all boats changed velocity by same amount.

• The pink boat - it's as massive as the gray boat and has the highest ending speed.

• All three - they all changed speed by the same amount.

• The gray boat - it takes more force to slow down an object than it takes to make it go faster.

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Alfonso, Julia, and Margie were having fun as they rolled some office chairs across a flat floor. All three chairs have the same mass. Margie gave each of the chairs a push, but not all from the same direction. Each chair changed speed as a result of being pushed. Use the information in the diagram to answer. Which chair(s) experienced the strongest force when it was pushed? How do you know?

• The black chair experienced the strongest force because it takes a stronger force to slow something down than it takes to speed something up.

• The blue chair experienced the strongest force because it had the fastest ending speed.

• All three chairs experienced the same strength force because they changed speed by the same amount.

• The pink and blue chairs experienced the strongest forces because they both gained the same force as they sped up. The black chair lost force, so it slowed down.

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In soccer, players kick a soccer ball across a flat field. At practice one day, three soccer balls that have the same mass were rolling across the field. They were each kicked by a soccer player, but not from the same direction. Each soccer ball changed speed as a result of being kicked. Use the information in the diagram to answer. Which soccer ball(s) experienced the strongest force when it was kicked? How do you know?

• The purple soccer ball because it has the fastest ending speed.

• The blue soccer ball because it takes a stronger force to slow something down than to speed something up.

• The blue soccer ball because it changed speed the most.

• The purple and yellow soccer balls because they gained force, while the blue soccer ball lost force.

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Why did the ball stop moving?

• The floor exerted a force that is opposite to the direction of the block’s motion.

• The block ran out of force.

• The floor absorbs force from the block.

• All objects stop moving because their natural state is to be still.

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Speed in a particular direction

• force

• velocity

• motion

In order for an object to start moving, the force must come from

• the same direction as the object's motion

• the opposite direction as the object's motion

• any direction

In order for an object to stop moving, the force must come from

• the same direction as the object's motion

• the opposite direction as the object's motion

• any direction.

A stronger force can cause a greater change in

• direction.

• speed.

• velocity.

• mass.

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Which of the following is one of the five ways an object's motion can change:

• hit something

• bounce off something

• Speed Up

• fly off the table

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What is the term for the force that opposes the motion of an object through a fluid?

• Gravity

• Friction

• Drag

• Thrust