SME
Grade 8 Science
Physical Science
Speed, velocity and acceleration
Main lesson
A walk on a position-time graph
Use this for “On a position-time graph, when is the walker standing still, moving fastest, or heading back to the start?”
Speeding up: a speed-time graph
Use this for “A cart speeds up from 2 m/s at 1.5 m/s² for 4 s. How fast is it going, and how far did it go?”
Steady, speeding up or slowing down?
Use this for “A toy car’s position is marked each second. Is it moving steadily, speeding up or slowing down?”
Newton's three laws of motion
Main lesson
Two skaters push apart: force pairs
Use this for “Two skaters push off each other. Who moves, and who speeds up more?”
Net force: a pull against friction
Use this for “A 50 N pull against 30 N of friction on an 8 kg box. What is the acceleration?” and “Why must you keep pushing to keep a box sliding at a steady speed?”
Balanced or unbalanced forces?
Use this for “What causes the sliding rock to slow down?”
Kinetic and potential energy
Main lesson
Kinetic energy: mass and speed
Use this for “What has a bigger effect on kinetic energy, doubling the speed or doubling the mass?”
A pendulum trades energy
Use this for “Where is the pendulum fastest, and where does it have the most potential energy?”
Kinetic or potential energy?
Use this for “Is a rolling skateboard’s energy kinetic or potential?”
Wave properties and the electromagnetic spectrum
Main lesson
Colors of visible light
Use this for “Which color of light has the longest wavelength?” and “How many waves of green light fit in one millimeter?”
Wave speed: frequency times wavelength
Use this for “A wave on a rope has a frequency of 2 Hz and a wavelength of 1.5 m. How fast does it travel?”
The spectrum from longest wave to shortest
Use this for “Order these waves from longest wavelength to shortest.”
Louder, or higher pitched?
Use this for “How do the vibrations compare for a louder sound versus a higher-pitched one?”
Digital or analog signal?
Use this for “Why are digitized signals a more reliable way to store and send information?”
Electric charge, current and simple circuits
Main lesson
Bulbs in parallel
Use this for “Two bulbs are wired in parallel across a 6 V battery. What current does each get, and what does the meter read?”
More bulbs in series
Use this for “A third identical bulb is added in series. What happens to the current and the brightness?”
Conductor or insulator?
Use this for “A gap in a circuit is bridged with one object at a time. Which ones make the bulb glow?”
Charges that pull together or push apart
Use this for “Two rubbed balloons are brought near each other. What happens?”
Magnetic fields and electromagnets
Main lesson
Magnetic field lines
Use this for “Draw the field around a bar magnet” and “What does a compass do near a magnet?”
Paper clips by turns of wire
Use this to record how many clips your electromagnet lifts with more turns.
Magnetic pull by distance
Use this to record how a magnet’s pull falls as it moves away.
Stronger or weaker magnet?
Use this for “Which change would make the electromagnet stronger?”
The periodic table
Main lesson
Reading an element’s group and period
Use this for “In which group and period is element 17?”
Protons, neutrons and electrons from the card
Use this for “An atom has 8 protons and a mass number of 16. How many neutrons does it have?”
Metal, nonmetal or metalloid?
Use this for “Which of these elements is a nonmetal?”
Which group does it belong with?
Use this for “Which element reacts most like sodium?”