1D & 2D
Kinematics
Kinematics
This scalar quantity refers to "how much ground an object has covered" during its motion, regardless of direction.
What is distance?
This law, often called the Law of Inertia, states that an object at rest will stay at rest unless acted upon by an unbalanced force.
What is Newton’s First Law?
Measured in Newtons, this is the amount of gravitational pull exerted on an object’s mass.
What is Weight?
This is defined in physics as the product of the force applied to an object and the displacement of that object in the direction of the force.
What is work?
This simple machine, found at the top of a flagpole or on a window blind, changes the direction of the force needed to lift an object.
What is a Pulley?
On a position-vs-time graph, the steepness, or slope, of the line represents this value.
What is velocity?
According to the Third Law, if a hammer exerts a force on a nail, the nail exerts an equal and opposite force on this.
What is the hammer?
This is the specific type of friction that acts on objects traveling through the air.
What is Air Resistance (or Drag)?
According to the formula KE = 1/2 mv2, if you double the velocity of a moving car, its kinetic energy increases by this factor.
What is Four? (Quadratic relationship)
A playground slide uses this force to slow you down, converting your kinetic energy into thermal energy.
What is thermal energy?
Ignoring air resistance, this is the approximate numerical value (in m/s2) of acceleration for any object in free fall near Earth's surface.
What is 9.8 m/s2?
If you double the net force acting on an object while keeping its mass constant, the acceleration will change by this factor.
What is two (or doubled)?
Derived from the Latin word for "center-seeking," this force keeps an object moving in a circular path.
What is Centripetal Force?
Because no machine is perfect due to friction, this "ratio" of useful work output to total work input is always less than 100%.
What is Efficiency?
In a car, this safety device increases the time of impact during a collision, thereby decreasing the force exerted on the passenger.
What is an Airbag? (Impulse-Momentum Theorem)
To achieve the maximum horizontal range for a projectile launched from the ground, you should use this launch angle.
What is 45 degrees?
This is the state of an object when the vector sum of all forces acting upon it is zero.
What is equilibrium?
This is the support force exerted upon an object that is in contact with another stable object, acting perpendicular to the surface.
What is Normal Force?
In a frictionless roller coaster, the sum of these two types of energy remains constant at every point on the track.
What is Mechanical Energy?
When a car turns sharply to the left, your body feels pulled to the right due to this "apparent" force, which is actually just your inertia.
What is Centrifugal Force?
A ball is dropped from a cliff that is 80 meters high. Taking g = 10 m/s2, this is how long it takes to hit the ground.
What is 4 seconds?
A 50 kg crate is pushed with a force of 300 N. If the force of friction is 50 N, this is the resulting acceleration of the crate.
What is 5 m/s2?
If a $10\text{ kg}$ box is sitting on a horizontal table with a coefficient of static friction (mu) of 0.4, this is the minimum horizontal force required to start it moving.
What is 39.2 N?
A 60kg student climbs a flight of stairs with a vertical height of 4 meters in 5 seconds. This is the student's power output in Watts.
What is 470.4 Watts?
You are walking at 1.5 m/s on a "moving walkway" at the airport that is moving at 2 m/s in the same direction. This is your velocity relative to a person standing still off the walkway.
What is 3.5 m/s?