Forces and Newton's Laws of Motion

Henry is building a treehouse in his backyard. He notices that every time he strikes a nail with the hammer, the hammer bounces back just a little bit as the nail goes farther into the wood. This is because when the hammer strikes and exerts a force on a nail, the nail...

• disperses the force of the impact throughout the wood.

• is stuck and won't go any further into the wood.

• creates a balanced force.

• exerts an equal and opposite force back on the hammer.

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   A balloon is inflated and then released as shown below. When the balloon is released, air is pushed out by the balloon. Which other force is acting that demonstrates Newton's third law of motion?

• The weight of the balloon pushes it in the opposite direction.

• The air is pushing back on the balloon in the same direction.

• Gravity is helping to move the balloon in the same direction.

• The air is pushing back on the balloon in the opposite direction.

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A book is sitting on a table at rest. Which of the following best describes the forces acting on the book?

• The forces on the book are balanced because the gravity pulling down on the book is equal to the upward force applied by the table.

• The forces on the book are unbalanced because the gravity pushing down on the book is not equal to the force of the table pushing up on the book.

• The forces on the book are balanced forces because the gravity pushing up on the book is equal to the friction from the table pushing the book to the right.

• The forces on the book are unbalanced because the gravity pushing up on the book is not equal to the friction from the table pushing the book to the right.

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 What is a force?

• a beginning place to measure the velocity of something

• push or pull that changes the motion of an object

• a literary term for comedy

• mass divided by volume

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 A hockey player is wearing ice skates and pushes against the wall propelling her backward on the ice. According to Newton's third law of motion, which of the following best compares the forces acting between the wall and the hockey player?

• The forces are equal and applied against gravity.

• The forces are equal and applied in the same direction.

• The forces are different sizes and applied in the opposite direction.

• The forces are equal and applied in the opposite direction.

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Krista is playing tennis at the park. When the tennis ball flies toward her, Krista hits the ball with her racket, which causes the ball to fly in the opposite direction.

 According to Newton's third law of motion, which of the following is true?

• When the racket hits the tennis ball with a force, the ball does not apply any reaction force to the racket.

• When the racket hits the tennis ball with a force, the ball applies a much weaker force in the opposite direction of the racket's force.

• When the racket hits the tennis ball with a force, the ball applies an equal force in the same direction as the racket's force.

• When the racket hits the tennis ball with a force, the tennis ball applies an equal but opposite force to the racket.

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Newton's Third Law States...

• Objects in motion stay in motion and objects at rest stay at rest
• Force is equal to mass times acceleration
• For each action there is an equal and opposite reaction

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An archer shoots an arrow. The action force is the bowstring against the arrow, the reaction force is...

• Air resistance against the bow
• the arrow's push against the bowstring
• the grip of the archer's hand on the bow

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What is the reaction force to a foot pushing down on the floor?

• The foot going through the floor
• The floor pushing back against the foot
• The floor breaking to the foot

According to Newton's Third law the strength or magnitude of forces will be...

• smaller
• equal
• larger

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