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AP Physics 1 > Forces > Flashcards

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

What is an Ideal Spring?

A spring that follows Hooke's Law: F=-kx