Force
a push or pull that one body exerts on another
force
For every action there is an equal and opposite reaction force
Newton's third law of motion
Tendency for an object to resist a change in motion
Inertia
What is the formula used in Newton's second law?
hint: remember the relationship between three key components.
F=ma
A pair of equal and opposite forces that always act on two different objects simultaneously when they interact
Action Reaction
forces that are equal and opposite
balanced
An object at rest will remain at rest and an object in motion will continue moving at a constant velocity unless acted upon by a net force
Newton's First Law
The force that works against inertia generally and slows objects in motion
Friction
If the mass increases, the acceleration _________
decreases
What happens in terms of force when a person pushes on a wall?
wall pushes back on the person
When an unbalanced force acts on an object; the object _____________
accelerates
The acceleration of an object is directly proportional to the net force acting on it and inversely proportionate to the mass
In other words, force equals mass times acceleration. F=MA
Newton's 2 law
Moving forward when a car stops or back when a car starts.
Pulling a tablecloth and items don't fall off.
etc
If an object has a mass of 5kg and is being thrown with 10n of force, how fast is its acceleration?
2 m/s2
Describe an example of 3rd law
Bouncing a basketball
Hitting a baseball
Rocket launches
Tectonic plates at a convergent boundary going up and down
The sum of all forces acting on an object equals the
net force
Shooting a basketball is an example of which of the 3 law(s)?
Mass
While riding a scooter, a kid pushes on the ground with a force of 100 N. Air pushes back with a force of 40 N. Together, the mass is 120 kg. What is the acceleration?
What is 0.5 m/s2?
100-40=60N
60/120=.5
According to 3rd law, when a bug hits a windshield of a car the force goes equal and opposite at both the car and the bug. Why does the bug splat and the car doesn't slow down at all?
Because of the difference in mass
What is each of these situations--a balanced force or unbalanced force?
1. A car moving at a constant speed.
2. A pencil rolling off a desk.
3. A picture frame sitting on a table.
1. Balanced
2. Unbalanced
3. Balanced
Name an example of a situation where only one Newton's Law is happening.
There are NO situations where only one law is happening!
An object with a lot of inertia that is moving is likely to do what
continue its motion
The greater the force results in the _______________ the acceleration
greater
Describe the action–reaction force between a rollercoaster seat and a rider during a sharp turn?
The seat pushes agaisnt the rider, and the rider pushes back against the seat.