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1. A push or pull is a force.
2. A push or pull on an object by another object that is touching it is contact force.
3. A force that one object can apply to another object without touching it is a noncontact force.
4. Examples of noncontact forces are
5. Forces have strength and direction.
6. An arrow can be used to show a force
7. Newtons are units of force.
1. The amount of matter in an object is mass.
2. The attractive force that exists between all objects that have mass is gravity.
3. Kilograms are often the units for mass.
4. All objects are attracted to one another with a gravitational force that is proportional to the mass of the objects and the distance between them according to the law of universal gravitation.
5.The gravitational force exerted on an object is weight.
Describe different situations in which you have experienced gravity, static friction, and sliding friction.
1. The force that resists the motion of two surfaces that are touching.
2. Static friction prevents surfaces from sliding past each other.
3. Up to a limit, the strength of static friction changes to match the applied force.
4. Sliding friction opposes the motion of surfaces sliding past each other.
5. Friction between a surface and a fluid, such as air or water is fluid friction.
6. Microscopic roughness is one reason for friction between surfaces. This is the dips and bumps of one surface that catch on those of the other surface.
7. One reason for friction between surfaces is that atoms and molecules with opposite charges attract each other.
8. Lubricants decrease friction by causing a slight separation between solid surfaces, so they don't contact each other.