*New CH 4, 5, 6 mixed Flashcards
(101 cards)
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 is the unit of force we use?
If you have weight, how do you find directional force?