Simple Machines
How does a simple machine make tasks easier?
(By changing the size, direction, or distance of a force.)
What do we call the combination of all the forces acting on an object?
(Net force.)
What force keeps planets in orbit around the Sun?
(Gravity.)
What does speed describe in the movement of an object?
(The distance an object travels in a certain amount of time.)
Define gravity in simple terms.
(Gravity is a force that pulls objects toward each other.)
What is the function of a fulcrum in a lever?
How do you find the net force when two horses pull in the same direction?
(By adding their forces.)
What force holds gases in the Sun?
(Gravitational force.)
What do we call a push or a pull acting on an object?
(Force.)
How does gravity affect the movement of planets and the Moon?
(It keeps planets in orbit around the Sun and the Moon in orbit around Earth.)
(Double Bonus! 600 pts) What is a pulley used for in simple machines?
If one horse pulls with 3000N and another with 4000N, what is the total net force?
(7000N.)
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(Double Bonus! 600 pts): Why does an object in orbit experience weightlessness?
(Because it is in free fall, even though gravity is still acting on it.)
How do we calculate acceleration using speed and time?
(Acceleration is the change in velocity divided by the time it takes for that change to occur.)
What role does gravity play in forming stars and planets?
(Gravity pulls matter together to form stars and planets.)
What type of simple machine is the blade of a hand-operated opener?
(A wedge.)
What is the net force when forces are balanced?
(Zero.)
What force gives weight to objects on Earth?
(Gravity.)
(Triple Bonus! 1200 pts): What is acceleration?
(An object's change in velocity is divided by the time it takes for that change to occur.)
What is a position in terms of object location?
(The location of an object in space.)
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What is found at the center of a wheel and axle?
(A rod.)
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(Triple Bonus! 1500 pts): What does it mean to calculate something mathematically?
(To determine the amount or number of something.)
What causes ocean tides on Earth?
(The Moon’s gravitational pull.)
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What is weight in relation to gravity?
(The measurement of the force of gravity on an object.)
(Double Bonus! 1000 pts): How do compound machines help in doing work?
(They reduce the force needed to apply.)