Force Basics
The Unit of Force
Newton
Tendency of an object to resist change in its motion. An object at rest stays at rest, an object in motion stays in motion at the same direction and speed (until something acts on it).
Newton's 1st Law
Change in position
Motion
Stored energy
Potential Energy (PE)
F = m*a.
How much force is required to accelerate a 2kg mass at 3 m/s^2?
6 Newtons
Force that acts between two masses. Acts downwards towards the center of the earth.
Gravity
When an object exerts a force on a second object, that object exerts an equal and opposite force on the first object
Newton's Third Law
Rate of change of position (how much time it takes to travel a distance)
Speed
energy in motion
Kinetic Energy (KE)
F = m*a.
What is the net force required to make a 50 kg surfer accelerate at a rate of 4 m/s^2
200 Newtons
Forces in the same direction are _____ together
Added together
The acceleration of an object is equal to the net force acting on it divided by the objects mass. F = m*a
Newton's 2nd Law
Describes the distance that an object moves in a specific direction.
Displacement
Law that states that energy cannot be created or destroyed, only converted from one form to another
Law of Conservation of Energy
F = m*a.
What is the upward acceleration of a helicopter with a mass of 5000 kg if a force of 10,000 N acts on it in an upward direction?
2 m/s^2
Overall force acting on an object
Net Force
The force of gravity acting on an object. Product of the mass and acceleration due to gravity
Weight
Average speed equation
V = d/t
Energy related to motion of objects. Ex : moving machine parts
Mechanical Energy
F = m*a.
A boy pushes forward a cart of groceries with a total mass of 40.0 kg. What is the acceleration of the cart if the net force on the cart is 60.0 N?
1.50 m/s^2
How a force represented.
Shows Direction and/or Strength. Length represents strength or magnitude.
Arrows
Measure of the amount of matter the object contains
Mass
If 2 vectors are going in opposite directions, you _____ the magnitudes
Energy stored in chemical bonds within a substance. Ex: Gasoline, human body
Chemical Energy
Calculate the total displacement of the person traveling in two Ubers.
Car # 1 moves 4 km north
Car # 2 moves 2 km south
Total displacement is 2 km