Newton's Laws
Newton's 3rd Law is also known as...
The law of action and reaction
What is the equation for Newton's 2nd Law?
F=MA
(Force = Mass x Acceleration)
What word is this defining?
The physical process by which objects break, or the weakening of structure
Damage
What word is this defining?
The sudden, forceful coming together in direct contact with two bodies
Collision
Back at the beginning of the unit, how many collision types/classifications did we say there were?
3
Newton's 1st law is also known as...
The law of inertia
A box has a mass of 20 kg and is moving at an acceleration of 4 m/s2. How much force is needed to move the box?
*Must have unit with answer
80N
What word is this defining?
The ability to do work or cause change
Energy
What is kinetic energy? Potential?
Kinetic energy: Energy of motion
Potential energy: Stored energy
Which collision type that we covered in class is this talking about?
- The object that was damaged or not damaged was moving at first and the other object was also moving
Type C
Which law is this an example of?
- You're bored and decide to go bounce on a trampoline
Newton's 3rd Law
What are the units needed for the equation?
- Mass unit?
- Force unit?
- Acceleration unit?
* In your answer, please let me know what unit goes with what part of the equation
- Mass unit: kg (kilograms)
- Force unit: N (Newtons)
- Acceleration unit: m/s2 (meters per second squared)
What word is this defining?
A push or pull on an object with mass that causes it to change velocity (to accelerate)
Force
What is peak force?
The maximum amount of force applied to an object in a collision
Which collision type that we covered in class is this talking about?
- The object that was damaged or not damaged was moving at first and the other object was not moving
Type A
Which law is this an example of?
- A mother and child are taking a walk together. Even though they started walking together, the child is ahead of the mother
Newton's 2nd Law
It takes a force of 850N to move an elevator. The elevator has a mass of 400 kg and there is a person inside with a mass of 55 kg. Find the acceleration.
*Round to the nearest hundredth; answer must include unit
Acceleration = 1.87 m/s2
What word is this defining?
The resistance that one surface or object encounters when moving over another
Friction
What word is this defining?
Frictional force that opposes the motion of an object as it passes through the air
Air resistance
Which collision type that we covered in class is this talking about?
- The object that was damaged or not damaged was not moving at first and the other object was moving
Type B
Which law is this an example of?
- The bus suddenly stops and all the students on the bus fall forward
Newton's 1st Law
There are 2 dogs playing tug-of-war with a rope toy. One dog is pulling with a force of 12N, while the other dog is pulling with a force of 28 N at an acceleration of 5.7 m/s2. What is the mass of the rope toy?
*Round to the nearest hundredth; answer must include unit
Mass = 2.81 kg
What is the definition for each variable?
Control variable:
Independent variable:
Dependent variable:
Control variable: A sample that remains the same or equal throughout an experiment
Independent variable: The variable you manipulate, or vary, in an experiment; it is not influenced by any other variable
Dependent Variable: The variable that changes as a result of the independent variable manipulation; the outcome you are interested in measuring
What is the difference between speed and acceleration?
Acceleration is the time it takes to get an object moving, speed is how fast an object moves
What collision type would this be an example of?
- Two kids are playing tag and run into each other
Type C collision