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Physical Science Chapter 5 Study Guide
Terms in this set (19)
a push or pull, or an action that has the ability to change motion.
the force of gravity on an object.
a force that resists the motion of objects or surfaces.
a force that has a magnitude and direction
created whenever an object is in contact with a surface
Force can increase or decrease the ________ of a moving object. Force can also _______ in which the object is moving.
speed; change the direction
_________ forces are important in technology.
__________ force is a universal force.
___________ force causes radioactivity.
____________ force acts between positive and negative charges and holds a molecule together.
_____________ ___________ force holds the nucleus together but only reaches a short distance.
____________ force causes all masses to attract to each other.
We use __________ to measure wight / force of gravity in everyday life but in science we use __________.
Whats the difference between mass and weight?
Weight is a force measured in newtons, it depends on mass and gravity. Mass is a fundamental property of matter measured in kilograms.
What are the 3 types of friction?
static friction; sliding friction; and fluid friction
Give an example of when it is beneficial to reduce friction and how would you do that?
When the friction between a shaft and an outer part of a machine produces a lot of heat. Friction can be reduced by placing ball berings between the shaft and the outer part.
Give an example of when it is beneficial to increase friction and how would you do that?
Shoes are designed to increase the friction between their soles and the ground.
The normal force has _________ _________ to the force pressing the object into the surface, which is often the object's ______?
equal strength; weight
For an object to be in equilibrium, all the forces acting on the object must add up to __________.
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