Science Terms-Ch. 5

equals distance traveled divided by the time it takes to travel that distance

S=d/t

the speed of an object and the direction of motion; changes when speed changes

occurs when an object speeds up, slows down or changes direction

a push or pull

a set of rules developed by Isaac Newton to explain how forces affect the motion of an object

a force between two surfaces in contact that resists the motion of the surfaces past each other.

the tendency to resist a change in motion

--pushing the wheelchair in a straight line and then trying to change the the direction of motion (turn)

is done when an applied force causes an object to move in the direction of the force
---picking up a box

a device thta makes work easier with only one movement: include the wedge, screw, lever, wheel and axle, pulley and inclined plane

Ex. screwdriver

a combination of simple machines

Ex. can opener

the number of times the applied force is increased by a machine is called the ________

an object, like a wheel, that has a groove with a rope or cable running through it.

It changes the direction of the input force

a rod or plank that pivots about a fixed point.

The point is called the fulcrum

a sloped surface, sometimes called a ramp.

It allows you to lift a heavy load by using less force over a greater distance

---Moving a couch from the ground into a trunk bed