Forces & Motion
A car travels 120 km in 2 hours. What is its average speed?
Speed = Distance ÷ Time = 120 km ÷ 2 h = 60 km/h
Name the three main states of matter and describe the arrangement of particles in each.
Solid – particles are tightly packed in a fixed pattern.
Liquid – particles are close together but can move past one another.
Gas – particles are far apart and move freely.
The space around the magnet where the magnetism can be detected is called?
Magnetic field
What is a light year
The distance that light travels in a year
What was Newton’s first PE Subject
Badminton
A skateboarder speeds up from 2 m/s to 10 m/s in 4 seconds. What is their acceleration?
(10 - 2) ÷ 4 = 2 m/s²
What is the process called when a liquid changes to a gas?
Evaporation or boiling.
Sometimes there will be some “X” mark when drawing the magnetic field, why?
The “X” mark will be labeled when those points are neutral, because the magnetic fields cancel each other out.
In what shape does comet orbit in
Oval / Elliptical
What is the effect that causes a stick to look bent when placed in a body of water
Refraction
A car increases its velocity from 10 m/s to 30 m/s in 5 seconds. What is its acceleration?
= (30 m/s – 10 m/s) ÷ 5 s = 20 m/s ÷ 5 s = 4 m/s²
Why do gases fill any container they are placed in?
Because gas particles move quickly in all directions and are far apart.
Explain the right-hand rule.
The right-hand grip rule is used when there is a wire with current flowing through it and you want to know which way the field is going. First, raise your right hand up, make a fist, and put your thumb up. Face the thumb to the direction where the current is running, then turn your fist inward and that will be the direction of the magnetic field of that wire.
What determines the gravitational field strength of a planet
Mass
What is the main cause of tides on Earth
The moon
Describe the motion of an object if the distance-time graph shows a straight line going upwards.
The object is moving at a constant speed the distance increases evenly over time.
What happens to the movement of particles when a substance is heated?
The particles move faster and spread further apart.
Explain Fleming's left-hand rule.
It is used when you want to find the motion of the wire. So, if the second finger is pointing towards you then the first finger will point to your right and the thumbs will be pointing upward. The second finger will give direction of the current, the first finger gives direction of the field from north to south, and lastly, the thumb will gives the direction of the wires motion.
What are the two proofs of big bang theory
Background radiation and red shift
What degrees Celsius is absolute zero (2 dcm)
-273.15
What does the area under a velocity-time graph represent, and how can you calculate it?
It represents the distance travelled.
You calculate it by finding the area under the graph line, using shapes like rectangles and triangles.
What is the difference between melting and freezing?
Melting is when a solid turns into a liquid.
Freezing is when a liquid turns into a solid.
How does a motor move?
Firstly, the wire will go through between the two magnets and curve back causing the current that goes through and the current that curves back to be in the different directions. If the North pole is place on the left and the South pole is place on the right, the current that go through the magnetic field will be push upward and the current that runs back will be push
Describe the life cycle of a star much more massive than the Sun
Nebula → Protostar → Main Sequence → Red supergiant → Neutron star / Black hole
What is the name of a particle (hypothetical) that is the cause of gravity.
gravitons