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Chap. 18 Weiser
| Question | Answer |
|---|---|
| The purpose of a machine is to: | make work easier |
| Most machines make work easier by trading force for distance means: | the object will decrease as the length of the ramp increases but the effort must be exerted through a longer distance |
| If you fill a bottle with sand and place it in water the bottle will: | sink only when the buoyant force is less than the weight of the bottle and its contents |
| The _____________ is the balance point of a lever. | fulcrum |
| ____________is the push or pull that causes changes in motion. | Force |
| A bicycle is or is not a simple machine? | is not |
| The word that best describes the force on a moving baseball is: | unbalanced |
| A ___________ ________________is a device, made of only a few parts, that makes work easier. | simple machine |
| When a football is thrown 20 yards __________ is done. | work |
| A force that opposes motion is called_____________. | friction |
| The buoyant force of a sealed, plastic bottle in water would be ________ ____or _______________than the bottle's weight. | equal to or greater |
| The force two arm wrestlers exert on each other's hands is: | balanced |
| When you use a bar magnet to pick up paper clips the force operating is: | magnetism |
| Pushing down on the free end of a lever to raise a load is an example of how the _________applied (effort) is _________than the load. The lever ________the amount of force needed to lift the load. | force less reduces |
| An ______________ ____________is a ramp or sloping surface. | inclined plane |
| The force of attraction that Earth exerts on objects is____________. | gravity |
| A pulley raising a block makes the job easier because although the pulley doesn't _________________effort force, it does change its ______________________. It is _____________to pull | multiply direction |
| A wedge, a chisel, and an axe are all what types of machines? | inclined plane |
| A _____________is a bar that makes it easier to move things. | lever |
| If two boys apply a force of 50 N. to a box at the same time and a 3rd boy pushes on the box at 50 N, what is the net force on the box? | 50 N, to the left |
| A wheel with a groove for a rope is called a ____________. | pulley |
Created by:
Mrs. Logan
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