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What you will learn from this videoWhat you will learn
- Newton's 1st law tells us that an object won't change its motion unless acted upon by a force.
- Newton's 2nd law tells us that heavier objects need a larger force to move them.
- Newton's 3rd law tells us that for every action there is an equal and opposite reaction.
- Discussion Questions
Before Video
What are some forces that cause objects to move?ANSWERSome forces are pushes, pulls, kicks, wind and water.
It depends on if the objects are moving in opposite directions or the same direction. If a car rear ends another, the first car will be pushed forward, while the second would slow down. If two cars are moving in opposite directions toward each other and collide, they would both eventually stop, and the metal of the cars would crumple.
Heavy objects don’t go as far as lighter objects when using the same amount of force. If you use more force on the heavier object than the lighter object, you might be able to throw them the same distance.
The movement of water can be a very powerful force. Some examples of the powerful force of moving water are tsunamis and flash floods.
Air moving can be a gentle force. Some examples of a gentle force could be a paper fan moving the air around you or blowing bubbles with the air from your mouth.
Different careers would require people to know about motion and forces. Many engineers design different things that move. They need to know how different materials move and interact with each other.
After Video
Newton’s first law of motion states that an object's motion remains the same unless a force acts upon it. What would be an example of this law in action?ANSWERIf a ball is still, it will remain still until a force, such as a kick, makes it move.
One example is pushing a car or pushing a shopping cart. You would need much more force to push a car the same distance as a shopping cart.
Newton’s laws of motion are helpful when making predictions of motion. This might be important if you were trying to step off a boat onto a dock. If you push off the boat, it will move away from the dock a little, which would be important to know if you don’t want to end up in the water.
Some more obvious forces might be pushes, kicks or pulls. Some less obvious forces are friction, gravity and air resistance. All these forces affect the movement of objects.
An example of this is a ball bouncing. You throw it down on the ground with a force, and it bounces back with an equal force.
Newton’s 1st law of motion says that an object in motion stays in motion unless a force acts upon it. Even if nothing appears to stop a moving object, forces such as friction, air resistance and gravity are all acting on the object to slow it down.
- Vocabulary
- Force DEFINE
A push or pull acting on an object.
- Newton’s 1st Law of Motion DEFINE
This law of motion states that an object’s motion won’t change unless acted upon by a force.
- Newton’s 2nd Law of Motion DEFINE
This law of motion states that heavier objects need a larger force to make them move.
- Newton’s 3rd Law of Motion DEFINE
This law of motion states that for every action there is an opposite and equal reaction.
- Gravity DEFINE
A force that pulls objects down towards the Earth.
- Friction DEFINE
A force resulting from two objects rubbing against each other.
- Air Resistance DEFINE
A force caused by air, acting in the opposite direction of a moving object.
- Acceleration DEFINE
The speeding up of an object.
- Balanced Force DEFINE
When two forces on an object cancel each other out, they do not affect the motion of the object.
- Unbalanced Force DEFINE
When one force is stronger than other forces on an object, they do affect the motion of an object.
- Force DEFINE
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