Forces & Motion
What is the net force if 120 N and 150 N act in the same direction?
270
What type of wave is created with a rope?
Transverse wave
What evidence supports continental drift?
Continents fit like puzzle pieces
What is natural selection?
Survival of best-adapted organisms
What produces light in stars?
Nuclear fusion
What must be true if an object does NOT accelerate?
Forces are equal and opposite
What determines how many waves pass per second?
Frequency
What do Mesosaurus fossils on different continents suggest?
Continents were once connected
Why do some plants survive in polluted soil?
Genetic variation + selection
What is cosmic background radiation?
Leftover energy from Big Bang
What happens if two forces act in the same direction on a resting object?
It accelerates in that direction
What happens to light entering water?
Refraction (bends)
What drives plate tectonics?
Convection currents in mantle le
What do similar embryos suggest?
Common ancestry
What causes galaxies to move apart?
Expansion of universe
What direction is friction acting on a sliding object?
Opposite motion
What determines wave speed?
Frequency × wavelength
Where do most earthquakes occur?
Plate boundaries
What happens to traits that help survival?
Passed to offspring
What keeps planets in orbit?
Gravity + inertia
According to Newton’s 3rd Law, what happens when a girl jumps off a boat?
Boat moves backward
Why are digital signals more reliable?
Less affected by noise/interference
Why was Wegener’s theory rejected
No mechanism for movement
What caused horse evolution over time?
Environmental selection + survival traits
What causes redshift
Objects moving away