Newton's Laws of Motion quiz

More questions about Newton's Laws of Motion

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1. 1 Medium

   Why do action and reaction forces in Newton's Third Law never cancel out?

   Answer: They act on different objects

   Why: Earth pulls a falling book with the same force the book pulls Earth up; Earth's huge mass hides its tiny acceleration.

2. 2 Easy

   What force slows a sliding hockey puck across rough ice?

   Answer: Friction

   Why: Pucks are frozen before games to reduce bouncing; struck hard, they can reach 100 mph (160 km/h) or more.

3. 3 Medium

   Why does a stone on a snapped string fly off in a straight tangent line?

   Answer: No net force acts to curve its path

   Why: Many people expect the stone to fly radially outward, but Newton's first law keeps it moving along its instantaneous velocity vector.

4. 4 Easy

   In Newton's Second Law, net force equals mass multiplied by which quantity?

   Answer: Acceleration

   Why: Acceleration is a vector, so a car rounding a bend without speeding up is still accelerating, pulled sideways by a net force.

5. 5 Easy

   From which country was Isaac Newton, the creator of the laws of motion?

   Answer: England

   Why: Newton served as President of England's Royal Society and spent three decades overseeing the Royal Mint.

6. 6 Easy

   What backward kick from firing a gun shows Newton's third law?

   Answer: Recoil

   Why: Recoil matches the bullet plus the escaping propellant gases, so a gun kicks back harder than the bullet alone would explain.