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Unit E1 Focus Words
noun – the energy an object has because of its relative position
What objects around you have potential energy?
noun – the energy of motion
The kinetic energy of falling water can grind wheat into flour, saving human effort. Can you think of something else powered by kinetic energy?
noun – the force slowing the motion of objects due to interactions along their surfaces
Do you think there is more friction with a steel wheel on a train track or with a rubber tire on asphalt?
noun – the quantity of motion of a moving body (mass x velocity)
How does a roller coaster’s momentum enable it to climb hills and complete loops?
noun – the speed in a certain direction
Explain a situation in which velocity changes even though speed stays constant.
noun – the rate of change of velocity per unit of time
A roller coaster train accelerates as it descends. Why?
noun – a force that acts between all masses, pulling them together
Everything that has mass has a gravitational field. Why is Earth’s gravity the most obvious to us?
noun – the property of matter by which things continue their current motion (either going straight at the same speed or staying still), unless a force acts upon them
More massive things tend to have more inertia. Can you think of an example?
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