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.

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