Y10 Flashcards
How to work out force?
Mass in kg x acceleration in m/s
How to work out velocity?
Distance dived by time
How to work out wave speed?
Frequency in Hz x wavelength in meters
What is Newton’s third law?
If object A exerts a force on object B, then object B must exert a force of equal magnitude and opposite direction back in object A
What do forces always come in?
Pairs
What is the name of the force that pulls humans down to the ground?
Gravity
What is the force that pushes against gravity?
Air resistance
How to calculate momentum?
Mass in Kg x velocity in m/s
What does momentum depend on?
Mass
Why does a lorry have a higher momentum then a car at the same speed?
More mass
What is the momentum of a wrecking ball at 500kg and moving at 10m/s
5000 kg m/s
How to calculate force?
mass x acceleration
How to calculate force?
Mass x change in velocity dived by time
How to calculate change in momentum?
Mass x change in velocity
What factors effect stopping time?
Mass of vehicle
Speed of the vehicle
Driver reaction time
State of vehicles breaks
State of road
Friction between tyre and road surface
What are transverse waves?
Particles move up and down as the wave passes
What are longitudinal waves?
Move back and forward compared to as the wave passes
Examples of transverse waves?
Water waves
2 ways to calculate wave speed using waves?
Frequency (Hz) x wavelength (metres)
Distance (metres) dived by time (seconds)
When light travels from air to glass it bends…
Away from the normal
When light travels from glass to air it bends…
Towards the normal
Increasing the wavelength of an electromagnetic wave decreases it…
Frequency
What was JJ Thompson idea of the atom
Negatively charge electrons spread around a positive charge e.g plum pudding
What is Rutherford idea of the atom?
The is a positively charged nucleus that is most of the mass of the atom
Most of the atom is empty space
The negatively charged electrons are in the empty space
What is the atomic number?
The amount of protons and electrons in the element
How to calculate the number of neutrons?
Atomic mass-atomic number(protons and electrons)
Examples of longitudinal waves?
Sound
