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Flashcards in Forces Deck (17):
0

A definition of a force?

A force is a push, pull or twist operating on an object. Measured in newtons (N)

1

Definition of a contact force?

A force that only acts between objects that are touching

2

Definition of a non-contact force?

A force that acts only between objects even though the objects are not touching

3

What do like poles do?

Repell

4

What do non-like poles do?

Attract

5

Examples of non-contact forces and what they do?

-gravity, pull
-magnetic,push/pull
-static electricity, push/pull

6

Examples of contact forces and what they do?

-friction,push
-Buoyancy,push
-air resistance, push/drag
-surface tension,pull
-thrust,push

7

How is gravity useful?

Gravity helps humans and objects stay on the ground

8

How is a magnetic force useful?

Magnetic fields are used in the modern technology such as electric engineering and electromechanics.

9

How is static electricity useful?

Antistatic floors- are used in hospitals to avoid static charge.

10

How is friction useful?

Friction between our shoes and the ground helps us from slipping.

11

How is buoyancy useful?

Buoyancy keeps a boat on top of the water so it doesn't sink

12

How is air resistance useful?

Wind in the sails of a sailboat. ( the moving wind meets the Resistance of the sail, and pushes the boat forward.

13

How is surface tension useful ?

Surface tension keeps a liquid together.

14

How is thrust useful?

Thrust can help an aircraft

15

What do you label forces with?

Newtons (N)

16

What is the structure of an atom?

The number of protons, neutrons, and electrons in an atom can be determined from a set of simple rules. The number of protons in the nucleus of the atom is equal to the atomic number. The number of electrons in a neutral atom is equal to the number of protons.