Newton's Laws and Free Body Diagrams

Which is the best example of Newton's First Law of Motion?

• a basketball thrown in the air falls to the ground

• a soccer ball remains motionless until it is kicked by a player

• a baseball player swings at an approaching ball

• an ice skater pushes back from a wall and moves backwards

An object is resting motionless on a surface. According to Newton's 1st Law, the object will only start to move if

• the net forces on the object equal zero

• an unbalanced force is applied to the object

• the upward force of the object is equal to its acceleration

• two forces that are equal and opposite are applied to the object

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Which example best explains Newton's Third Law of Motion?

• When a glass slid across a table, it spilled water when it stopped suddenly.

• An engine used less work to move a lighter car than when it moved a heavier car.

• When you sit on a chair, your body exerts a downward force on the surface of the chair, while the chair exerts an equal and upward force on your body. 

A truck that is travelling at a constant speed is carrying some boxes.  If the truck comes to a sudden stop, what will most likely happen to the boxes?

• They will stay in the middle of the truck.

• They will slide toward the front of the truck.

• They will slide toward the back of the truck.

• They will fall off the side of the truck.

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A student throws a ball against a wall.  Which statement best explains what is happening in the picture.

• The energy of the ball is destroyed as it strikes the wall.

• The energy of the ball becomes negative as it hits the wall.

• The force from the wall on the ball is equal and opposite to the force from the ball on the wall.

• The force exerted by the ball on the wall is greater than the force exerted by the wall on the ball.

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Object X has twice the mass of Object Y.  Both objects are accelerating at the same rate.  Which statement best describes the motions of Object X and Object Y.

• Object X is travelling at twice the speed as Object Y.

• Object X is travelling at half the speed as Object Y.

• Object X requires twice the force to accelerate at the same rate as Object Y.

• Object X requires half the force to accelerate at the same rate as Object Y.

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Who invented the 3 Laws of Motion?

• Sir Francis Bacon

• Sir Isaac Newton

• Johannes Kepler

• Galileo Galilei

If you are shooting a basketball, the basketball pushes on your hand as your hand pushes on the basketball.  This is Newton's 3rd law of motion that says

• for every action there is an equal and opposite reaction

• an object at rest will stay at rest unless acted on by an unbalanced force

• acceleration is produced when a force acts on a mass, the greater the mass, the greater the amount of force needed to accelerate the object

• an object in motion will remain in motion unless acted on by an unbalanced forece

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The soccer ball is sitting on the half line and Zach runs up to kick it.  What law will occur when he kicks it?

• An object at rest will remain at rest unless acted on by an unbalanced force.

• An object will remain motionless until it decides to move.

• The harder Zack kicks the ball, the less distance it will travel.

• Time travel has always been possible.  You just have to believe.

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Newton's first law that says an object at rest will remain at rest unless acted upon by an unbalanced force is also called the law of 

• acceleration

• inertia

• action and reaction

• may the force be with you