Forces and Newton’s Laws. Force. A Force is a push or a pull that one body exerts on another. . All Forces are measured in Newtons (N). Balanced Forces. Force that are equal in opposite directions and act on an object to produce a net force of zero. . 20N. Net force = 0. 20N.
A Force is a push or a pull that one body exerts on another.
All Forces are measured in Newtons (N)
Force that are equal in opposite directions and act on an object to produce a net force of zero.
Net force = 0
Balanced Forces cause no change in motion
Forces acting on an object to produce a net force that is positive.
Net force = 5N
Box moves to the right
Unbalanced Forces cause a change in motion.
Friction is the force between two objects that opposes the motions of either object.
Example: Rubbing your hands together.
Air Resistance is the force that acts on objects as they move through air.
The amount of air resistance acting on an object depends on two factors:
1) Speed (Velocity). The faster an object moves, the more air resistance acts on it
More air resistance Less air resistance
2) Surface area. The larger the surface area of an object the more air resistance acts in it.
Less air resistance More air resistance
Gravity is the force that holds everything in the universe together.
“Every object in the universe exerts the force of gravity on all other objects.”
Gravity depends on two factors:
2) Mass. The greater the mass of an object, the more gravity it exerts on other objects.
Weight is a force. It is the force that gravity exerts on an object due to the object’s mass.
“Like all forces weight is measured in Newtons.”
Weight depends on two factors: Weight = MassxGravity
More Weight 5N
Less Weight 2.5 N
weight=massxacceleration of gravity
Less Weight 2.5 N
More Weight 5N
Newton’s First Law states, “An object at rest will remain at rest unless acted upon by an unbalanced force while an object in motion will remain in motion with constant speed and
direction unless acted upon by an unbalanced force”
It is often called the Law of Inertia.
An object’s tendency to resist a change in it’s motion.
the golf ball have the same
The more massive an object is, the greater its
And the greater an objects inertia is, the greater
the force required to put the object in motion
Only the seatbelt stops them.
The greater the mass (of the object being accelerated) the greater
the amount of force needed (to accelerate the object).
Everyone knows that heavier objects require more force to move the same distance as lighter objects
Newton’s Second Law gives us an exact relationship between
force, mass, and acceleration.
It Sates that the amount of force needed to move an object is equal to it’s mass multiplied by its acceleration
FORCE = MASS times ACCELERATION
Mike's car, which weighs 1,000 kg, is out of gas.
Mike is trying to push the car to a gas station,
and he makes the car go 0.05 m/s/s. How much force is Mike using?
Answer = 50 newtons
Newton’s Third Law states, “For every action there is an equal and opposite re-action”
What does this mean?
This means that for every force there is a reaction force that is equal in
size, but opposite in direction.
That is to say that whenever an object pushes another object it gets pushed back in the opposite direction equally hard.
Explains how a rocket works