Definitions & Conversions
Define Physics.
The study of the laws of nature.
What is the difference between mass and weight.
Mass is the amount of matter in an object while weight is the gravitational force that acts on an object.
Forces come in pairs. True or False?
True
Gravity is the ________ force of nature.
What is the measurement system used in Science?
Système International S.I.
Define Force
Push and pull.
Which of the following changes on different celestial objects due to the force of gravity?
Weight
What are Newton's 3 Law of Motion?
1st: Law of Inertia
2nd: F=ma
3rd: The action and reaction forces are equal in magnitude and opposite in direction.
What is Earth's acceleration due to gravity?
9.81 m/s²
What is the significance of "g" in the equation F=mg? What is the numerical form of "g"?
acceleration due to gravity
9.81 m/s²
How many nanometers in a meter? Write the number in decimal form and scientific notation.
1 x 10⁹ nm
1,000,000,000 nm
How does mass affect the rate at which an object free falls?
Mass does not affect the rate at which an object fall.
What is the force of a car with a mass of 20,000kg accelerating at 20m/s²?
400,000kg x m/s²
400,000 N
If the distance between two objects were doubled, the force would be...
one quarter (1/4) of the original force. (r=distance squared in the equation for Universal gravitation. When the distance of the objects is greater, the less gravitational force there will be)
Ms. Rocki has a mass of 2,000 lbs. Calculate her weight. Write the answer below. (Round to the nearest tenth place)
8,909.1 N
Convert 89g to kg
.089kg
As the mass of an object rises or falls, does it's weight change?
Yes. The more mass an object has, the more gravitational force it experiences.
2,000kg
Newton's Law of Universal Gravitation states that:
Objects attract other object with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
Calculate the force of gravitational attraction between two spheres of mass 20kg and 55kg that are 25 m apart.
1.74 x 10 -𝟣𝟢 N
The number ____ is associated with each metric prefix.
1
In a vacuum, does an objects mass affect the rate at which it free falls toward the Earth?
No. Objects with different masses will fall at the same rate due the rate of constant acceleration on Earth.
What is the acceleration of a space shuttle that is 100,000 lbs with a force of 600,000N?
6 m/s²
Which astrophysicist developed the Law of Universal Gravitation?
What other mathematicians and physicists did that astrophysicist piggyback off to develop the Law of Universal Gravitation?
Isaac Newton
Robert Hooke
Christopher Wren
Edmund Halley
Max Kepler
Write the equation for the following words:
1. Weight
2. Universal Gravitation
3. Acceleration
4. Newton's 2nd Law
5. Velocity
1. Weight : W=mg
2. Universal Gravitation : F=G ✖️m1✖️m2/r²
3. Acceleration : v/t
4. Newton's 2nd Law : F=ma
5. Velocity : d/t