Law of Inertia
An object will remain at rest or ______________unless acted upon by a net external force.
in a constant state of motion
The push or pull that causes motion or change in motion.
What is a force?
What are the two key characteristics of an action-reaction force pair?
Equal in size, opposite in direction.
Why does a toy car keep rolling after you let go of it
it keeps rolling because it wants to keep doing what it's already doing Unless something like hitting a wall stops it.
How mass affects acceleration with constant force (more mass, less acceleration).
What is an inverse relationship?
When you push on a wall, the wall pushes back on you with what kind of force
An equal and opposite force.
What happens to a ball sitting on the ground if no one kicks it?
the ball will stay still until so outside force affects it
5 kg object is pushed with 25 N of force; what is its acceleration?.
What is 5 m/s²? (25 N / 5 kg)
In a rocket's launch, the action is the rocket pushing gases down; what's the reaction
the gases pushing the rocket up.
Why do you feel pushed forward in a bus that suddenly stops.
Your body wants to keep moving forward, even when the bus stops When the bus stops, your body's inertia makes it want to continue in its original state of motion
The force unit named after the scientist who developed these laws.
What is the Newton?
An archer shoots an arrow; the bowstring pulls the arrow forward. What's the reaction force?
The arrow pulls the bowstring backward
If you fired a cannonball in space, how much force would be needed to keep it moving?
No additional force would be needed once it leaves the cannon. In frictionless space, there are no forces like air resistance or friction to slow it down, so it would continue moving at a constant speed and direction indefinitely
To find mass, you divide force by this.
What is acceleration
True or False: Action-reaction forces act on the same object?
False, they act on different objects.