Forces & Motion
The study of matter, energy, and how they interact.
Physics
An object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force = inertia
Newton's 1st Law
Amy uses 20N of force to push a lawn mower 10 meters. How much work does she do?
200 J
If the rock falls from the hill, it is _______ energy.
Kinetic energy
A roller coaster car sitting at the top of the hill has this type of energy.
Name everyone in class
Answers vary.
The force that causes things to move (Work).
Energy
An English physicist, mathematician, and astronomer. Famous for his work on motion; his "Three Laws of Motion"
Major contributions include:
Three Laws of Motion
Calculus (independently discovered)
Isaac Newton
How much work does an elephant do while moving a circus wagon 20 meters with a pulling force of 200N?
4,000 J
You serve a volleyball with a mass of 2.1 kg. The ball leaves your hand with a speed of 30 m/s. The ball has __________ energy. Calculate it.
945 joules
When a roller coaster moves down a hill, this type of energy increases as its potential energy decreases.
Kinetic Energy
What can you catch, but not throw?
A cold
The push or pull on an object causing it to change itsvelocity.
Force
For every action (force) in nature there is an equal and opposite reaction.
Newton's 3rd Law
Alex applies 350 N of force to move his stalled car 40 m, how much work did Alex do?
14,000 J
A cinder block is sitting on a platform 20 m high. It weighs 79 N. The block has __________ energy. Calculate it.
15,499.8 J or 15,484 J
Give me an example of Kinetic Energy.
Answers vary.
What starts with T, ends with T, and has T in it?
Teapot
What are other types of energy?
Calories in food
Horsepower in engines
Watt in electricity
What is the formula to find force?
Force= mass x acceleration
Angela uses a force of 25 Newtons to lift her grocery bag while doing 50 Joules of work. How far did she lift the grocery bags?
Measurement --> meters
2 meters
DAILY DOUBLE!!!
What is the potential energy of a 3 kilogram-ball that is on the ground?
0 J
What is the formula for Kinetic energy?
What does each letter stand for?
KE= 1/2 x mass x velocity2
Daily wager! Trash can roulette!
who???
This term refers to "pulls objects toward Earth" and what is its measurement?(make sure to include # and correct measurement)
Points will not be given if not provided.
9.81 m/s2 or 9.8 m/s2
This law helps explain why heavier objects require more force to start moving than lighter ones.
Newton's Second Law
The baseball player does 1234 Joules of work when hitting a baseball into left field. Assuming the baseball landed 100 meters away from home plate, how much force did the player use to hit the ball?
Measurement --> N (newtons)
12.34 N
DAILY WAGER!!
Two objects were lifted by a machine. Object C had a mass of 2 kilograms, and was lifted at a speed of 5m/sec. Object D had a mass of 4 kilograms and was lifted at a rate of 3 m/sec.
a. Which object had more kinetic energy while it was being lifted?
b. Which object had more potential energy when it was lifted to a distance of 10 meters? Show your calculation.
a. Object C has a more kinetic energy
b. Object D has more potential energy
What is the formula for Potential energy?
What does each letter stand for?
PE= mass x gravity x height
What occurs once in a minute, twice in a moment, and never in 1,000 years?
The letter M