# *New CH 4, 5, 6 mixed Flashcards

How to solve for x: trig angle = X/B

SLIDE: B trig angle = x

How do you find the leg closest to the angle (adjacent to the angle) if you have the hypotenuse?

hyp * cos angle

If you are given a force and a mass, you can find ____ by using the equation ____

a = F/m

a newton (force) divided by acceleration (m/s2) will give you

mass (kg)

if force = mass * acceleration, then mass=

FORCE / ACCELERATION

How to solve for x: trig X = A/B

UNTRIG: trig-1 (A/B) = x

Diagonal force (down along the plane) is

Fd is directional, or down the plane,

parallel to the plane, along the plane

Why don’t you see the earth move when you jump up?

It is so massive that it barely moves

What is the unit of weight we use?

NEWTON

Give an example of Newton’s second law in real life:

harder to push a car than to push a skate board (mass resists acceleration, f=ma)

What are other words for “UNTRIG?”

arctrig, or inverse trig.

(arcsin, arctan, arccos or inverse sine, inverse tan or inverse cos)

Coefficients of friction are _____ for surfaces that are smooth and ____ for surfaces that are rough, or sticky.

smaller, larger

If you are given a mass and an acceleration, you can find ____ by using the equation ____

Force, F= ma

How do you sketch the net force from free body diagram?

PARALELLOGRAM RULE

Give an example of Newton’s first law in real life

an apple on a desk.

net force is zero, until you push it off (things at rest or motion stay that way)

sin 70 = cos __

20

What is Newton’s Second Law?

Force increases acceleration,

mass resists accelertion F= ma

sin 50 / cos 50 = tan ____

50

If you are given a force and an acceleration, you can find ____ by using the equation ____

mass, m= F/a

When you get the resultant X and the resultant Y, how do you find the magnitude of the resultant force?

use pythagorean theorem.

R = sqrt (Fx^2 + Fy^2)

What weighs 100N?

3 Gallons of milk

Where is the hypotenuse?

It is the longest side.

Always the side across from the right angle. It is the diagonal.

The force of friction always acts____

in the opposide direction of motion

What are the three equations from newton’s second law? (my fish is from massachusetts)

a=F/m F= ma F/a = m

What does the word “adjacent” mean?

It means “NEXT TO”

why does a bullet go faster forward than the gun moves backwards if they have the same force?

the gun has more mass.

If you push a roller skate with the same force that you push a bus, the rollerskate will accelerate faster! Mass resists acceleration.

What is the mass of an object that acceleraties 5 m/s2 when a 30N force is applied?

m= F/a

so 30/ 5 = 6kg

What weighs 1000N?

Mr. Nystrom wearing a backpack full of books

What is Newton’s First Law?

Object stays at rest, or moves at a constant velocity in a straight line unless a force acts on it.

What does SOH CAH TOA stand for?

sin angle= opp/hyp

cos angle = adj/hyp

tan angle = opp/adj

In a right triangle, the sine of one of the acute angles always equals the ____ of the other acute angle

Cosine

How much does a 3kg object weigh?

about 30N

What will the acceleration be of an 800kg car that is pushed with a force of 8000N? (ignore friction)

10m/s2

complementary angles add up to

90 degrees

Give an example of Newton’s third law in real life:

the floor is pushing up on you as much as you are pushing down on the floor (equal and opposite)

cos h = sin ____

90-h

a newton (force) divided by a mass (kg) will give you

an acceleration (m/s2)

What is a way to think of mass when it comes to movement?

MASS RESISTS ACCELERATION

this is what we call inertia

What is a NEWTON a unit for?

for FORCE and WEIGHT

weight is a force

The force between the block and the ramp is

the normal force, Fn