VOCABULARY
The Transfer of energy is fined as _______.
Work
According to Newton’s second law of motion, force is equal to mass times_________.
Acceleration
A wheelbarrow with a load of bricks is sitting on top of a hill. The total mass of the wheelbarrow is 45kg. The height of the hill is 20m. The wheelbarrow has potential energy. Calculate the amount of energy.
PE = mass x gravity (9.8 m/s2) x height
PE = 45 x 9.8 x 20 = 8,820 Joules
As a bow is being pulled back to fire an arrow, the amount of ______________(2 words) energy is building.
Elastic Potential
What is the definition of mechanics?
physics of motion and forces
What is “An explanation that has been proven accurate through testing and Experimentation”?
A Theory
Newton’s 3rd Law states that for every action there is an ___ and ______ reaction.
Equal and Opposite.
A car with a mass of 1,200kg is traveling down the road. The driver is using cruise control so she is maintaining a constant speed of 24 m/s. The car has kinetic energy. Calculate the amount of energy.
KE = 1/2mv2
KE = 0.5 x 1,200 x 24 x 24 = 345,600 Joules
The higher up an object is the more _______________ (2 words) energy it has.
Gravitational Potential
What is the definition of scalar?
physical quantity that has a magnitude, but no direction
What is the definition of a Hypothesis.
A supposed explanation given before conducting an experiment. Not a Guess but a prediction using IF and THEN.
"An object at rest tends to stay at rest and an object in motion tends to stay in motion with the same velocity unless acted upon by an unbalanced force" describes which law?
Newton's First Law
You serve a volleyball with a mass of 2.1kg. The ball leaves your hand with a speed of 30 m/s. The ball has kinetic energy. Calculate the amount of energy.
KE = 1/2mv2
KE = 0.5 x 2.1 x 30 x 30 = 945 Joules
Names two types of forces that come from atoms or their particles.
Strong connection and weak connection.
what is the definition of scalar?
physical quantity that has both a magnitude and direction
Give the definition on Energy and the two different types.
The ability to do work or cause change.
Kinetic and Potential
Going the same speed, would a Semi Truck colliding with a motorcycle exude more force or would a car colliding with a motorcycle exude more force? Why?
Semi Truck because it has a bigger mass.
A ball is rolling at 2 m/s. The mass of the ball is 3 kg. The ball has kinetic energy. Calculate the amount of energy.
KE = 1/2mv2
KE = 0.5 x 3 x 2 x 2 = 6 Joules
Mr. Kacena walked into the classroom at 7:00 AM and turned on the lights. Name at least 3 energy transformations that occurred.
Chemical – electrical – light
or
Electrical – light - thermal
Can velocity be relative?
Yes, there can be different frames of reference
What are the four fundamental forces of nature?
Electro-magnetism, Weak interaction, Strong interaction, Gravitation
In a game of tug and war, Miss Steel pulls to the left with a force of 45 N and Miss Flaherty pulls to the right with a force of 50 N. What is the net force? And who won?
5N and Miss Flaherty
A roller coaster is sitting at the top of a 72m hill and weighs 966N. The coaster has potential energy. Calculate the amount of energy.
PE = mgh
PE = 966 x 9.8 x 72 = 681,609.6 Joules
Name three energy transformations that occur when a match is lit. Is this a chemical or physical change?
Chemical – Light – Thermal.
Chemical Change
What is the ideal angle to launch a projectile the farthest?
45 degrees