Flashcards in Forces Deck (15):

1

## If zero net force implies zero acceleration, is an object with zero net force always at rest?

### Zero acceleration does not imply zero motion, simply indicates velocity is constant

2

## What two forces act upon a book at rest on a table?

### Normal force with the table (FN) and weight (Mg)

3

## Normal Force always acts ____________ to the surface.

### Perpendicular

4

## What is Static Equilibrium?

### When an object is at rest and remains at rest due to zero net forces

5

## When will the magnitudes of forces subtract?

### When the vectors occur in opposite directions (ie. South and North)

6

## When will the magnitude of forces add together?

### When the vectors occur in the same direction (ie. both North)

7

## What is Hooke's Law?

### The length of a spring is directly proportionate to the applied weight; occurs when a mass is hung vertically from an elastic spring

8

## What is the equation for Hooke's Law?

### F=-kx; k is spring constant (N/m)

9

## On an incline, what is the equation for normal force (mass=M, angle=θ)?

### FN= |Mgcosθ|

10

## On an incline, what is the equation for the net force of the object (mass=M, angle=θ)?

### ΣF=-Mgsinθ

11

## What is Centripetal Force?

### Inward force component (ie. tension of an object swinging in a cone)

12

## What is the equation for centripetal force?

### Fc=(mv^2)/R

13

## What is Friction?

### Contact force between two surfaces that is responsible for opposing sliding motion

14

## What is the equation for friction?

### Ff=μFN

15