Newton's Law Flashcards
What is Newton’s first law of physics?
Newton’s first law of motion states that an object will remain at rest, or will not change speed or direction, unless it is acted upon by an outside unbalanced force.
LAW OF INERTIA
What is normal force?
opposite to gravity
What is the free diagram forces for incline plane - just recall the forces.
5 forces, gravity, normal, thrust - acceleration, wind resistance and friction
What is Inertia?
Inertia is an object’s resistance to change in its velocity, and it depends on its mass.
The greater the mass of an object, the more inertia it has.
A car vs a bicycle:
A moving car is harder to stop than a bicycle because the car has greater inertia.
What is momentum? (dont need to know jus know for mc mayb)
Momentum is a measurement of mass in motion. Any object that is moving has momentum.
momentum = mass x velocity KG*M/S
What is gravity?
Gravity is the force of attraction that exists between any two objects.
The size of the force of gravity between two objects depends on the mass of both objects and the distance between them.
earth vs skydivers, earth has the greater mass - more effect of gravity
What is weight (dont need to know jus know tho)?
Weight of an object is a measure of the force of gravity on the object.
Weight = mass x gravity
mass = matter
What is Newton’s second law?
Newton’s 2nd Law states that the acceleration of an object depends on the force applied to it and its mass.
What is Newton’s 3rd law of physics?
Newton’s third law of motion states that for every action there is an equal and opposite reaction.
When you push against a wall, the wall pushes back against you with an equal and opposite force. - normal force
or shoot a gun, bullet goes forward and pushes gun backwards - recoil
What is work (dont need to know but do)?
Whenever you apply a force to an object, the object moves in the direction of the force.
Work is done to the object.
(IN JULES) (J)
work done = force * distance travelled
weight lifter does work
What is the relationship between work and energy?
Energy can be transferred to an object by doing work on it - LAW OF CONSERVATION OF ENERGY - Energy cannot be created or destroyed, it can only change form.
Kinetic energy vs potential energy:
Potential energy – stored energy
Kinetic energy – energy of movement
e.g. Elastic PE– stored energy in stretched or compressed objects.
formula will be given in exam - jus figure it out (wont be tho) - gpe = mgh
mass gravity height
