Past Paper Flashcards
What is charge
A property of all matter
What is current
The rate of flow of charge
Why does a series circuit havw higher resistance than a parallel circuit
In circuit Y there are two pathways for current
When the temperature of water increases what happens to the pressure and the speed of the gas particles
The pressure increases and so does the speed
How to calculate momentum
Force x velocity
Why are peer review and communication between scientists important
Per review - to check the method to make sure it doesn’t have mistakes
Communication - can compare the data with their own
Explain the difference in density between solids and liquids.
Atoms are more tightly packed in a solid than a liquid meaning more particles take up a given volume in a solid than a liquid
The energy needed to heat 1 kg of water by 1 °C is 4200 J.
The energy needed to evaporate 1 kg of water is 2 256 000 J.
This is much more than 4200 J. Explain why.
Increasing temp kf 1Kg of water by 1 degree only requires the molecules to move faster
Evaporation of the water requires the intermolecular forces to be overcome
What is work done in words
The energy transferred
The ball is stationary on the field. Explain why using Newton’s laws.
The first law states that
The forces on the all are balanced, meaning the resultant force is 0
Student A kicks a ball with their toes.
This hurts the student’s toes. Explain why using Newton’s laws.
The third law
Meaning the force of the foot on the ball = the force of the ball on the foot, meaning it causes his foot To hurt
Why does using a variable resistor improve an experiment with a circuitry
-> allows the p.d to be varied across the circuit
-> allows the mean resistance to be calculated
-> allows a graph to be plotted
-> can check if wire has linear dependence on pod
