Energy
A driver, not as good—no Hamilton—no control. He fumbles and tumbles—a curve in sight. A cliff—oh no, the barrier is not strong enough. The car goes flying. Potential energy in the beginning, but what does it convert to before it hits the ground?
Kinetic energy
Which Newton’s law explains why objects stay at rest unless acted on by a force?
Newton’s First Law
What type of path does an object in circular motion follow?
A circle
If you drop a spoon on the moon, it's like a broom. Why does it land on the ground like a bloom?
Gravity
What type of energy is stored in a stretched rubber band?
Elastic potential energy
Which surface creates more friction: rough or smooth?
Rough
What is the formula that connects force, mass, and acceleration?
F = ma
What is the name of the force that keeps an object moving in a circle?
Centripetal force
Do heavier objects fall faster than lighter ones (neglect air resistance)?
NO ^^
If you lift a book higher off the ground, does its gravitational potential energy increase or decrease?
Increase
What force allows you to walk without slipping?
Friction
If you push a wall, what does the wall do according to Newton’s Third Law?
Pushes back with equal force
In circular motion, is the force directed toward the center or away from it?
Toward the center
What happens to gravity as distance between objects increases?
It decreases
If you throw up a dumbbell. At the very top of its path, before your life flashes in front of your eyes. What type of energy does it mainly have?
Gravitational potential energy
Why did Charles Goodyear invent the rubber tire? (He didn't want to be like a rocket on New Year's.)
To increase friction with the road
A heavier being needs WAY more force to accelerate the same amount. Which law explains this?
Newton’s Second Law
If the centripetal force suddenly disappears, what path does the object follow?
A straight line
Why do astronauts feel weightless in orbit?
They are in free fall
If no energy is lost, what happens to the total mechanical energy of a system?
It stays the same (is conserved)
You are sliding down a mountain. Suddenly friction disappeared completely. What would happen to you besides having the ride of your life?
You would keep moving forever at constant speed
Why do passengers move forward when a car suddenly stops?
Inertia (Newton’s First Law)
When swinging a ball on a string, what provides the centripetal force?
Tension in the string
Is gravity stronger on Earth or the Moon?
Earth