A hockey puck slides across ice with very little friction. Why does it keep moving?
AA force keeps pushing it forward
BIts inertia keeps it in motion
CThe ice pulls it along
DAir pressure pushes it
Once the puck is set in motion, its inertia — its resistance to changing its state of motion — keeps it sliding. No force is needed to maintain constant motion.
Question 2 True / False
An object with more mass has more inertia.
TTrue
FFalse
Answer: True
Mass is the measure of inertia. More mass means greater resistance to any change in motion.
Question 3 Short Answer
Why is it harder to push a full shopping cart than an empty one?
Think about your answer, then reveal below.
Model answer: The full cart has more mass and therefore more inertia, so it resists changes in motion more than the empty cart.
Greater mass means greater inertia, which means more force is needed to produce the same change in motion.