CERTIFICATION EVALUATION TEST PAPER
QUESTIONS SOLUTIONS GRADED A PLUS
◉ What are energy stores?
Answer: Thermal
Kinetic
GPE
Elastic
Chemical
Magnetic
Electrostatic
Nuclear
◉ How can energy be transferred?
Answer: Mechanically
Electrically
Heating
Radiation
◉ What is an open system?
,Answer: Energy and matter can be transferred between the system
and its surroundings
◉ What is a closed system?
Answer: A system where neither matter nor energy can enter or
leave
◉ What is work done?
Answer: Another way of saying energy transferred
◉ What are the 2 types of Work Done?
Answer: Mechanical
Electrical
◉ What is kinetic energy?
Answer: The energy an object has due to its motion
◉ How to calculate kinetic energy?
Answer: 1/2 x mass x velocity^2
◉ How does speed affect kinetic energy?
Answer: The faster an object goes the more kinetic energy
,◉ How does mass affect kinetic energy?
Answer: The kinetic energy of an object increases as its mass
increases
◉ What is the unit of mass?
Answer: Kilograms (Kg)
◉ What is the unit of velocity?
Answer: MWheters per second (m/s)
◉ What is the unit of work done?
Answer: Joules (J)
◉ What is the unit of power?
Answer: Watt (W)
◉ What is the unit of energy?
Answer: Joules (J)
◉ What is mass?
Answer: A measure of the amount of matter in an object
, ◉ What is gravity?
Answer: The force of attraction between two objects
◉ What factors affect gravity?
Answer: Mass
Distance
◉ What is the gravitational field strength on earth?
Answer: 9.8 N/kg
◉ How to work out Gravitational potential energy?
Answer: mass x gravitational field strength x height
◉ What is the gravitational field strength on the moon?
Answer: 1.6 N/Kg
◉ What is weight?
Answer: A measure of the force of gravity on an object
◉ How to calculate weight?
Answer: weight = mass x gravity