O.D.U Flashcards
State what is meant by an acceleration of 0·32 m s−2
The velocity increases by 0·32 m s-1 each/per second
Evidence that supports the Big Bang theory
Cosmic Microwave Background Radiation
Calculate tension between caravan and car
- Add masses and calculate acceleration
2.Use F=ma with the acceleration and the force of the object being pulled
Reading on scale when person is in lift
Calculate unbalanced force F=ma with weight and acceleration
Calculate using W=mg
Add both values
What is impulse?
The change in momentum of an object / area under a force time graph
What happens in an elastic collision
Momentum is conserved and kinetic energy is conserved
What happens in an inelastic collision
Momentum is conserved, kinetic energy decreases
What happens in an explosion
Momentum is conserved and kinetic energy increases
State the law of conservation of linear momentum
In absence of external forces, the total momentum before a collision equals the total momentum after a collision
State Newtons first law
An object will remain at rest or travel in a straight line at a constant velocity if the forces are balanced
State Newtown 2nd law
F=ma
State Newtowns 3rd law
For every action there’s an equal and opposite reaction
What is the principle of conservation of energy
Energy cannot be created or destroyed, only converted from one form to another
What are Einsteins two postulates
- When two observers are moving at constant speeds relative to one another they will observe the same laws of physics.
- The speed of light (in a vacuum) is the same for all observers.
Acceleration
The increase in velocity each second
