## Higher Physics Unit 1

##### Created by:

monaghan_j  on September 16, 2012

##### Description:

Revision Flashcards for SQA Higher Physics

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Higher Physics

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# Higher Physics Unit 1

 What is the difference between distance and displacement?Distance has only size Displacement has size and direction
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What is the difference between distance and displacement? Distance has only size
Displacement has size and direction
What is the difference between speed and velocity? Speed is the rate of change of distance
Velocity is the rate of change of displacement
What are the Scalar quantities? Any that have size but no direction e.g
Distance, speed, time, mass, energy, temperature, pressure
What are the Vector quantities? Any that have size and direction e.g
Displacement, velocity, acceleration, force, momentum, impulse
What is the resultant of a number of forces? A single force that has the same effect as the other forces combined
How do you find the vertical and horizontal components of a projectile? CHAVS
Cos Horizontal And Vertical Sin
How do you find the component of weight down a slope? mgsin∅
S for Slope S for Sin
What is acceleration? The change in velocity each second
How do you measure acceleration? 1) Determine the initial and final velocity and the time taken to accelerate
2) A double mask of known length interrupting a light gate connected to a timer can be used
What is the Newton? The force that causes 1kg to accelerate at 1m/s²
What is momentum? mass of object x velocity of object
When can the law of conservation of momentum be applied? If there are no external forces and they are moving in one dimension
What is the difference between an elastic and an inelastic collision? Elastic - Momentum and kinetic energy are conserved
Inelastic - Only momentum is conserved
What are the 3 ways to calculate impulse? 1) Change in momentum (mv-mu)
2) Force x Time of collision
3) Area under Force - Time graph
What happens if you increase the time of impact of a collision? 1) Impulse = Ft
2) If Impulse is constant and t increases
3) Then average force F must decrease
What is density? Mass per m³
How do the densities of solids, liquids and gases compare? Gas density is 1000 times smaller than solids and liquids
This is because the gas particles are 10 times further apart making it's volume 1000 times greater (lxbxh)
What is one Pascal? One Newton per m²
What is pressure? The force per unit area
Explain buoyancy force 1) Pressure increases with depth
2) Therefore pressure on the bottom surface is greater than the pressure on the top surface
3) This gives a resultant force upwards
Explain the relationship between pressure and volume
(constant temperature and mass)
1) If the volume of a container is reduced then gas particles will hit the container walls more OFTEN
2) This will increase the average force
3) So pressure must increase
Explain the relationship between pressure and temperature
(constant volume and mass)
1) If the temperature is increased then the kinetic energy of the gas particles is increased
2) The particles will collide with the walls of the container more OFTEN and more violently increasing the force on the walls
3) So pressure must increase
Explain the relationship between volume and temperature
(constant pressure and mass)
1) If the temperature is increased then the kinetic energy of the gas particles is increased
2) The particles will collide with the walls of the container more OFTEN and more violently increasing the force on the walls
3) Volume increases to increase the surface area
4) Keeping the pressure constant
What is absolute zero? The lowest temperature possible where all particle motion stops
How do you convert Degrees to Kelvin? Add 273
D.K.A