Force and Motion

At what point on a roller coaster does the train have the highest kinetic energy?

• at the bottom of the first drop
  

• at the top of the second hill
  

• when the train first leaves the loading station 

• at the top of the first drop 

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Samuel kicks a soccer ball across a grassy field and it eventually comes to a stop. If Newton’s law of inertia is true, why did the ball stop? 

• Newton’s law only applies to objects at rest. 

• The mass of the ball is not great enough to have inertia. 

• Friction with the grass applies a net force on the ball causing it to decrease its speed. 

• Gravity slowed the ball until it came to a stop. 

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Which is newtons 3rd law

• for every thing there is reaction

• for every reaction there is a unusual action

• For every reaction there is an equal and opposite reaction

• for every reaction there is an good action

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Newton's third law states that any action will have a(n) _______ and ______ reaction

• equal and same

• equal and opposite

• equal and equal to

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What happens to the speed of an object if the net force acting on it is zero?

• It speeds up

• It slows down

• It remains constant

• It changes direction

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What is the principle behind Newton's third law of motion?

• For every action, there is an equal and opposite reaction

• Force equals mass times acceleration

• Objects at rest stay at rest unless acted upon by an external force

• Velocity of an object will not change unless acted upon by an external force

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What is the unit of force in the International System of Units (SI)?

• Joule

• Newton

• Watt

• Pascal

What is Newton's first law of motion also known as?

• The law of inertia

• The law of acceleration

• The law of action-reaction

• The law of gravity

What is the force that opposes the motion of objects through air?

• Gravity

• Friction

• Air resistance

• Tension

Which of the following is an example of kinetic energy?

• A compressed spring

• A car moving down a road

• A book sitting on a table

• A battery inside a flashlight

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