Forces
what is forces?
The push or pull on an object with mass causes it to change its velocity
what is?
the ability to do work
what is power?
great or marked ability to do or act; strength; might; force.
what is Newton’s Laws,
Newton’s Laws is In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.
what is the formula for force?
f=m.a
what is one fact about energy?
Energy can be neither created nor destroyed.
what is the formula for power?
p=w/t
p= power
w= work
tringle t= elapsed time
who discovered newton's laws of motion
Sir Isaac Newton
when does force play role in physics?
whenever there is an interaction between two objects?
who created energy?
Thomas Young
what is one fact about power?
Power is just a way of describing the flow of energy (one joule per second) and the result is a Watt.
what is one important fact about Newton’s L
an object will not change its motion unless a force acts on it.
what is the unit of measure for force?
A newton (N)
What is the kinetic energy of a 60 kg man running at 8 m/s?
k= 1920j
what is one fact about power?
the measurement of the rate at which work is done. It is
what is the formula
Newton's second law, which states that the force F acting on a body is equal to the mass m of the body multiplied by the acceleration a of its centre of mass, F = ma
how is force measured?
using a newton meter.
A 1 kg ball is held at rest at a height of 2 meters above the ground. What is the gravitational potential energy of the ball-Earth system?
u= 19.62j
how did newton prove his laws?
Newton performed no experiments to discover the laws of motion.