### Chapter Three: Forces

Mr. Jason R. May

Use the terms from our chapter three vocabulary worksheet to complete the following crossword. There will be no spaces between answers consisting of more than one word. Good luck!

 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

Across
1.Friction-like force that opposes the motion of objects as they move through the air; depends on the object's size, shape and speed (2 Words)
6.An object moving at a constant velocity keeps moving at that velocity unless an unbalanced force acts on it (5 Words)
8.The frictional force that prevents two surfaces from sliding past each other
13.An attractive force between any 2 objects that depends on their masses and the distances between them
16.This value can be found by multiplying an object's mass (in kg) by the acceleration due to gravity (near the Earth's surface)
19.When one object exerts a force on a second object, the second object exerts a force that is equal in strength and opposite in direction (5 Words)
20.The force that opposes the sliding motion of two surfaces that are in contact
23.The amount of matter in an object; pull of gravity does not factor into this measure
24.The force that opposes the motion of two surfaces sliding past each other; caused by microwelds constantly breaking and forming as an object slides along the surface (2 Words)
26.It was discovered in 1846 by astronomers studying the motion/ orbit of Uranus (and, of course, using Newton’s laws); (a.k.a. Le Verrier’s Planet)
Down
2.Acceleration = (net force) / mass or F(net) = m x a (5 Words)
3.Acceleration toward the center of a curved or circular path
4.The tendency of an object to resist any changes in its motion
5.Law of..........; if a group of objects exerts forces only on each other, their total momentum does not change (it is simply transferred) (3 Words)
7.A push or a pull
9.This is the highest speed a falling object will reach (2 Words)
10.Forces in nature that adhere to Newton's third law of motion; for every force applied in nature there is an equal and opposite reaction force (3 Words)
11.Newton’s Law Of..........; first published in 1687; provides an equation such that the force of gravity between any two objects can be determined (if their distances and masses are known) = (constant) x ((mass 1) x (mass 2)) / (distance squared) (2 Words)
12.Anything that is thrown or shot through the air
13.the value of..........is now known to be approximately 6.67 x 10 to the -11 meters cubed/ kg x seconds squared
14.A space virtually devoid of matter
15.This is the force exerted toward the center of a curved path (2 Words)
17.Points of contact between two surfaces from which friction occurs
18.the product of an object's mass and its velcoity; represented with the symbol p
21.This is the frictional force between the tires and the road surface;..........is the centripetal force that keeps a car on the road while it rounds a curve
22.The frictional force between a rolling object and the surface it rolls on
25.The symbol given to the acceleration due to gravity (close to the Earth’s surface, which equals 9.8 m/s/s)

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