Formulas
Velocity
v=d/t
What are the forces acting on a person that is sitting on a chair?
1) force normal perpendicular to the surface of the chair
2) force gravity
Why does weight change on different planets?
Weight measures how strongly a planet's gravity pulls on an object. Therefore, an object on a planet with more mass and a stronger gravitational force than the earth would weigh more than it would on earth.
kinetic energy
the energy which a body possesses by virtue of being in motion.
F=MA
A ball is rolled from point a to point b and someone track the Distance travelled acceleration, and velocity. When the person creates a graph of distance over time, the result is a quadratic relationship. What is the relationship between the acceleration of the ball and time?
What happens to the wavelength of a wave when the frequency is doubled?
Inertia
The tendency of an object to resist motion. inertia is also known as mas.s.
Speed=wavelength(frequency)
A car is moving at a velocity of 25 m/s and weighs 1.kg. What is the car's momentum?
P= 37.5 kg/m(s)
As a wave moves from one region of air into a region in which the wave speed is slower, the wavelength
1) gets larger
2) gets smaller
3) stays the same
2) gets smaller
Newtons 3rd law
Every action has an equal and opposite reaction.
Centripetal force
mv2/r
Jimmy throws three balls at different angles, with the same force, and from the same position. In which trial did the ball travel the farthest from jimmy?
Trial 1: 35-degree angle
Trial 2: 73-degree angle
Trial 3: 45-degree angle
Trial 3
What is the velocity of a runner if they ran 100 meters in 10 seconds
10 m/sec
Constructive interference
Constructive interference is when two waves that are in phase coincide, causing the waves two allign. This creates a wave that has the amplitude of the individual waves added together.
Electrical current
I=P/V
Why are our desks black?
The desks absorb all the visual light and don't reflect any of it.
If you were in a falling elevator, would you survive by jumping before it hits the ground?
No.
What is the difference between work and power?
Work= force( distance)
Power = work/time
Power is the rate of work