Podcast
Questions and Answers
What principle is demonstrated when a fireman turns on his hose, water goes forward & he is knocked backwards?
What principle is demonstrated when a fireman turns on his hose, water goes forward & he is knocked backwards?
- Newton's 2nd Law of Motion
- Newton's 3rd Law of Motion (correct)
- Newton's 1st Law of Motion
- Newton's Law of Universal Gravitation
Which law explains why it takes less force to move a DVD than a DVD player?
Which law explains why it takes less force to move a DVD than a DVD player?
- Newton's 3rd Law of Motion
- Newton's 1st Law of Motion
- Newton's 2nd Law of Motion (correct)
- Newton's Law of Universal Gravitation
What law is demonstrated when you need to push a heavy ball harder to get it to move as fast as a small one?
What law is demonstrated when you need to push a heavy ball harder to get it to move as fast as a small one?
- Newton's 3rd Law of Motion
- Newton's Law of Universal Gravitation
- Newton's 1st Law of Motion
- Newton's 2nd Law of Motion (correct)
Which law states that a soccer ball will not move until a player kicks it?
Which law states that a soccer ball will not move until a player kicks it?
Which law indicates that more force results in more acceleration?
Which law indicates that more force results in more acceleration?
If air is let out of a balloon quickly, which law explains the balloon going up?
If air is let out of a balloon quickly, which law explains the balloon going up?
Which law is represented when it takes less force to push a bike than a motorcycle?
Which law is represented when it takes less force to push a bike than a motorcycle?
What does 'force = mass times acceleration' refer to?
What does 'force = mass times acceleration' refer to?
Which law states that an object in motion stays in motion unless acted on by an outside force?
Which law states that an object in motion stays in motion unless acted on by an outside force?
What does 'for every action there is an equal and opposite reaction' describe?
What does 'for every action there is an equal and opposite reaction' describe?
Which principle explains how a bowling ball hits the pins sending them flying for a strike?
Which principle explains how a bowling ball hits the pins sending them flying for a strike?
Which law states that an object at rest stays at rest unless acted on by an outside force?
Which law states that an object at rest stays at rest unless acted on by an outside force?
What principle is demonstrated when feet push down on the floor and the floor pushes up at feet as you walk?
What principle is demonstrated when feet push down on the floor and the floor pushes up at feet as you walk?
What law is reflected by the fact that a 12 lb bowling ball goes faster down the lane than a 15 lb bowling ball?
What law is reflected by the fact that a 12 lb bowling ball goes faster down the lane than a 15 lb bowling ball?
Which law explains why you feel pushed back into your seat during takeoff in a plane?
Which law explains why you feel pushed back into your seat during takeoff in a plane?
What principle is illustrated when you push a large box and a small box with the same force, and the small box moves faster?
What principle is illustrated when you push a large box and a small box with the same force, and the small box moves faster?
Which law states that a seatbelt stops you from hitting the windshield if you hit the brakes quickly?
Which law states that a seatbelt stops you from hitting the windshield if you hit the brakes quickly?
What law describes why a boy can throw a football farther than his friend because he uses more force?
What law describes why a boy can throw a football farther than his friend because he uses more force?
Which law explains that when you push on a door it pushes back with equal and opposite force?
Which law explains that when you push on a door it pushes back with equal and opposite force?
Which law applies when someone crashes their bike into a rock and is thrown over it to the ground?
Which law applies when someone crashes their bike into a rock and is thrown over it to the ground?
What law is evident when pushing a baby on a swing is easier than pushing an adult?
What law is evident when pushing a baby on a swing is easier than pushing an adult?
What principle explains why water spills from a glass carried by someone who is walking steadily and suddenly stops?
What principle explains why water spills from a glass carried by someone who is walking steadily and suddenly stops?
When thrown with the same force, which law states that a soccer ball accelerates more than a bowling ball?
When thrown with the same force, which law states that a soccer ball accelerates more than a bowling ball?
What law is illustrated when a magician pulls a tablecloth out from under a dish on a table without disturbing the dish?
What law is illustrated when a magician pulls a tablecloth out from under a dish on a table without disturbing the dish?
What principle is shown when a boy gets out of a boat and as he moves forward the boat is pushed back?
What principle is shown when a boy gets out of a boat and as he moves forward the boat is pushed back?
What law explains a rocket launching into outer space when fuel exhaust and fire go down?
What law explains a rocket launching into outer space when fuel exhaust and fire go down?
Which law states that a book rests on the top of a shelf and does not move until a student accidentally knocks it off?
Which law states that a book rests on the top of a shelf and does not move until a student accidentally knocks it off?
What concept is represented when the merry-go-round was going fast until 5 more kids got on?
What concept is represented when the merry-go-round was going fast until 5 more kids got on?
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Study Notes
Newton's Laws of Motion
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Newton's 1st Law of Motion: An object remains at rest or in uniform motion unless acted upon by an external force. Examples include:
- A soccer ball will not move until kicked.
- Objects in motion stay in motion; e.g., a bowling ball hitting pins sends them flying.
- A baby in a swing requires external force to start moving.
- When walking steadily and suddenly stopping, water spills from a glass due to inertia.
- A magician can pull a tablecloth from under a dish without disturbing it due to inertia.
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Newton's 2nd Law of Motion: The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. This is articulated by the formula: force = mass x acceleration. Examples include:
- Less force is needed to move lighter objects like a DVD compared to heavier ones like a DVD player.
- A heavier ball requires more force to achieve the same speed as a lighter ball.
- Pushing a bike is easier than pushing a motorcycle due to its lower mass.
- A 12 lb bowling ball rolls faster than a 15 lb bowling ball when thrown with the same force.
- When comparing two boxes pushed with the same force, the smaller box moves faster due to its lower mass.
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Newton's 3rd Law of Motion: For every action, there is an equal and opposite reaction. Examples include:
- A fireman pushing water forward with a hose experiences a backward reaction.
- When air is let out of a balloon, it pushes downwards and causes the balloon to rise.
- Pushing on a door results in the door exerting an equal force back.
- When someone jumps out of a boat, the boat moves in the opposite direction.
- A rocket launching upward uses the expulsion of exhaust gases downward to generate thrust.
Additional Examples
- Feeling pushed back into a seat during a plane takeoff exemplifies inertia (1st Law).
- A boy who throws a football farther due to applying more force illustrates the 2nd Law.
- A merry-go-round accelerating with additional weight highlights the balance of mass and force in motion (2nd Law).
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