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Flashcards in C5 Terms Deck (72)
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1

Force (F)

A push or pull on a system. Can either be scalar or vector.

2

Newton (N)

The SI unit of force.

3

Strong nuclear force

The force that holds protons and neutrons together in nuclei.

4

Electromagnetic force

The attractive or repulsive force produced by static and moving charges in atoms.

5

weak nuclear force

A force exerted between elementary particles of matter within the nucleons

6

gravitational force (Fg)

The force exerted by all matter on other matter.

7

contact force

The force that acts between systems when one system touches another.

8

List four mechanical (contact) forces

Compression - drill pressTension - dog on leash pullingTorsion - twisting lid off bottleShear - shear pins

9

How is dynamics different from kinematics?

Dynamics is the sudy of how forces affect an objects motion, and kinematics is the science of discribing how things move.

10

What kind of physical quantity is a force?

A vector quantity.

11

What is the SI unit of force?

a Newton

12

What symbol for force is used in diagrams?

An arrow.

13

What 2 symbols are used for force in formulas?

F or an f with an arrow on top.

14

Compare contact and field forces

Contact forces are exerted by objects that are in contact with each other. Field forces act across distances without physical contact.

15

Which fundamental force is responsible for holding the universe’s matter in recognizable structures such as planets?

Gravity

16

If forces acting on a system produce a net force, what can we say about those forces?

They are unbalanced forces.

17

What is the mathematical relationship between weight and mass of an object?

w=9.81N/kg*mass

18

What restriction exists in using 9.81 N/kg as the proportionality constant for determining weight?

It has to be near the Earths surface.       

19

(T/F) Compressive and tensional forces act in opposite directions on a system?

TRUE

20

field

The mathematical description of a field force exerted in the space surrounding an object that is the source of or is susceptible to the field force.

21

field force

A non contact force exerted on a susceptible object by similar objects.

22

Do all field forces visibly affect all matter?

No, some materials are susceptible to certain field forces, and others are not. (Electric and magnetic forces for example) All materials are affected by a gravitational field.

23

balanced force

A force that in combination with other forces acting on the same system produces a zero net force on the system.

24

external force

A force exerted on a system by something in its surroundings.

25

net force

The single unbalanced force acting on a system that is the sum of all forces acting on the system.

26

unbalanced force

A force that in combination with other forces acting on the same system results in a nonzero net force and produces a change in motion of the system.

27

inertia

The tendency of all matter to resist change in motion.

28

What is the physical property of inertia?

Mass

29

Laws of motion

Written by Newton and define the science of dynamics and apply to all areas of mechanics.

30

law of inertia (Newton's first law)

A law stating that objects at rest remain at rest and objects in motion continue in a straight line at a constant velocity unless acted upon by a net external force.