Basic Physics (Unit 1) Flashcards
What are the 6 SI base units?
- m
- kg
- s
- A
- K
- mol
What is the SI base unit for length?
- metre (M)
What is the SI base unit for mass?
kg
What is the SI base unit for time?
seconds (s)
What is the SI base unit for electrical current?
Ampere (A)
What is the SI base unit for thermodynamic temperature?
degree Kelvin (K)
What is the SI base unit for amount of substance?
mole (mol)
What is a Scalar?
a quantity that has magnitude only.
What is a Vector?
a quantity which has both magnitude and direction
Examples of Scalar?
-distance
-speed
-density
-pressure
-time
Examples of Vectors?
-displacement
-velocity
-acceleration
-force
What is density?
a substances mass per unit volume
What is the conversion for 1 g/cm^3 into kg/m^3
1g/cm^3 = 1000 kg/m^3
What is meant by the turning effect of a force
A moment
Principle of moments?
For a system to be in equilibrium (1)
Sum of anticlockwise moments [about a point] = Sum of clockwise moments
[about the same point]
How do you work out density?
P = M/V
What is Density?
mass per unit volume
What is centre of gravity?
-single point within a body at which the entire weight of the body may be considered to act
How to work out moment?
Force (N) x perpendicular distance from pivot (m)
Why is the velocity constant horizontally and changing vertically in projectiles?
- no forces horizontally
-gravity acts vertically
Experiment to measure the density of solids? equipment list?
- weighing scale
- 30 cm ruler
- vernier callipers
-various regularly shaped solids both rectangular and circular
Experiment to measure the density of solids? Cube or cuboid
-For rectangular objects create table with mass , width, length , height calculated volume and density stating their units
- Measure the mass using the weighing scale
-measure the length height and width using the ruler and calculate volume
- use the equation density = mass/volume
Experiment to measure the density of solids? sphere
-measure diameter using vernier callipers and half for radius
- on table keep measurements on left stating the appropriate units and calculate density to an appropriate amount of significant figures
- use equation 4/3 pi r^3 to calculate density of the sphere
