### Unit 1

 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

Across
4.the rate at which velocity changes over time
6.a force that resists the motion between two surfaces in contact
9.a push or pull;soomething that changes the motion of an object
11.the force that objects exert on eachother because of their mass
12.a simple machine that is an inclined plane wrapped around a cylinder
13.a wheel with a grooved rim that turns on an axle
16.a scientific law stating that an objects at rest remain at rest, and objects in motion with the same velocity, unless ated on by an unbalanced force
18.unit of force and sometimes weight
Down
1.a scientific law stating that the acceleration of an object increases with increased force and decreases with increased mass
2.a speed in a specific direction
3.the way an object is going
5.a scientific law that stating that everytime one object exerts a force on another object, the second object exerts a force that is equal in size and opposite in direction back on the first object
7.a simple machine that is a sloping surface, such as a ramp
8.one of the basic machines on which all other mechanical machines are based
10.a simple machine that is a wheel attached to the shaft or axle
12.the measure how fast something moves through a particular distance over a definate time period
14.a solid bar that rotates, or turns around a fixed point
15.the resistance of an object to a change in the speed of the direction of it's motion
17.a simple machine that has a thick end and a thin end

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