Newtons 1st Law
Newtons First Law says...
An object at rest or in motion will continue unless an unbalanced force stops it.
I push you, you push me back. What law explains this?
Newtons 3rd Law (Action & Reaction)
Newtons Second Law says...
An objects acceleration depends on its mass and the force applied to it
When you slam on the brakes in a car, your body continues to move forward. Why does this happen to your body? Explain using Newtons 1st Law.
This happens due to inertia (your body wants to keep doing what it was doing)
Newtons 3rd Law Says...
What is the main concept of Newtons First Law?
Inertia!!!
A ball keeps rolling down a hill until the friction of the ground stops it. Which law explains this?
Newtons 1st Law (Inertia)
What is the main concept of Newtons 2nd Law?
There is a relationship between Force, Mass, and Acceleration
Two drivers (one in a delivery truck, one in a small car) press down on the gas with equal force. The small car sped up at a faster rate compared to the delivery truck. Explain using Newtons 2nd Law.
The more mass an object has, the slower it accelerates.
When you walk, your feet push down against the ground (action). What is the reaction?
The ground, in turn, pushes back on your feet with an equal and opposite force, moving you forward.
What is the definition of Inertia?
an object will keep doing what it has been doing. (it will stay still or keep moving)
The same amount of force is used to push an empty shopping cart and a full shopping cart. However, the empty shopping cart moves faster. Which law explains this?
Newtons 2nd Law (Mass, Force, Acceleration)
Explain the relationship between Mass and Acceleration AND Force and Acceleration
More Mass= Less Acceleration
More Force = More Acceleration
Imagine a hockey puck sliding on a nearly frictionless ice surface. When the puck is struck by a hockey stick, it begins to move, traveling across the ice. Explain this using Newtons 1st Law.
the force of the hockey stick caused the puck to start moving, and the friction and air resistance acted as forces that gradually brought it to a stop.
Define the following: Action and Reaction
Action: force that the first object exerts
Reaction: force that the second object exerts back
If you kick a soccer ball in the grass, it will eventually slow down because of which force?
Friction
A person needs to use more force to push a car than they do for a bike. Which law explains this?
Newtons 2nd Law (Mass, Force, Acceleration)
Define the following: Mass, Acceleration, Force
Mass: The amount of material in an object
Acceleration: How fast an object speeds up or slows down
Force: a push or pull
An astronaut in space is floating near a space station. To get closer to the space station, the astronaut throws a heavy object away from the station.
What happens to the astronaut when they throw it? Explain using Newtons 3rd Law.
Action: The astronaut applies a force (throws) the heavy object AWAY from the station
Reaction: The object applies an equal and opposite force back which pushes the astronaut TOWARDS the station.
This is what happens when a person jumps off a boat into water, what will happen to the boat according to Newtons 3rd Law?
It will move backwards (opposite and equal reaction)
What are the 3 characteristics of motion AND their definitions?
Speed: measure of fast/slow an object moves (example: miles per hour)
Velocity: measure of speed AND direction (example:miles per hour toward the beach)
Acceleration: measure of how quickly an object speeds up/slows down
When you let go of a balloon filled with air, it flies around in various directions. Which law explains this?
Newtons 3rd Law (Action & Reaction)
When you roll a tennis ball and a bowling ball with the same force, the tennis ball initially accelerates faster. However, over time, the tennis ball slows down and eventually stops, while the bowling ball continues to roll. How can you explain this?
The soccer ball accelerates quicker than the bowling ball because it has less mass. However, because the soccer ball has less mass, it also has less inertia, meaning it's easier to stop or slow down.
You are walking on an ice. As you try to push against the surface to move forward, you slip and fall.
Why does this happen, despite you applying a force on the ground? Explain using Newtons 3rd Law.
Newton’s Third Law is still at play (action-reaction), but the reaction force is not strong enough to counteract the lack of friction between the ice and your shoes. Without sufficient friction, the reaction force isn’t enough to move you forward or keep you balanced.
What were the 3 examples used in the video when talking about Newtons 3rd Law and how were these examples explained?
Rocket (action: gas pushed against ground, reaction: ground shoots rocket up)
Swimming (action: swimming strokes, reaction:water pushes you)
Jumping (action: feet push against ground, ground pushes you into air)