Mass, Weight, and Inertia
The standard International System of Units (SI) unit used to measure mass
What is the kilogram (kg)?
Frictional resistance between two solid surfaces is caused at a microscopic level by these irregularities catching on one another.
What are surface bumps and grooves (or atomic stickiness)?
According to Newton's Second Law, the acceleration of an object is inversely proportional to this property
What is mass?
The state of falling where gravity is the sole force acting on an object, with zero air resistance.
What is free fall?
In a Free-Body Diagram of a crate sliding at a constant velocity, the forward push arrow and the backward friction arrow must be drawn this way
What is equal in length (or balanced)?
This physics quantity measures the force of gravity acting on an object and changes depending on its location in space.
What is weight?
The type of friction force acting on a stationary object that balances an applied push and prevents motion from starting
What is static friction?
If an 15 N horizontal force is applied to a box on a floor experiencing 6 N of sliding friction, this is the net force acting on the box.
What is 9 N?
The two factors that determine the strength of air resistance on a falling object in nonfree fall.
What are speed and frontal surface area?
The instant a skydiver steps out of a helicopter before picking up speed (R = 0 N), his acceleration is this.
What is 9.8 m/s/s or 10 m/s/s?
If you are floating in space wearing thick gloves and need to distinguish a heavy hammer from a light screwdriver without looking, you should do this to test their inertia.
What is shake them back and forth?
When Sanjay pushes a refrigerator across a kitchen floor at a steady, constant speed, the force of sliding friction is equal and opposite to this
What is Sanjay's push?
If the net force acting on a moving cart is doubled, the mass of the cart must do this for its acceleration to remain completely unchanged
What is double?
As a skydiver falls faster and faster through the atmosphere, upward air resistance increases, causing their net force and acceleration to do this.
What is decrease?
When Bronco (1000 N) encounters 400 N of air resistance while accelerating downward, his acceleration is this
What is 6 m/s/s?
When a string tied beneath a heavy ball is yanked down rapidly, this string snaps due to the ball's mass and inertia.
What is the bottom string?
Between static and kinetic friction for the exact same two surfaces, this one always has the larger maximum value.
What is static friction?
A 550 kg boulder is pushed with 300 N of force against 130 N of friction. Its acceleration is this.
What is .31 m/s/s?
Terminal velocity is achieved when upward air drag builds up to equal this downward force.
What is weight (or gravity)?
Immediately after Bronco opens his parachute, air resistance surges to 2000 N against his 1000 N weight, causing his acceleration vector to point in this direction
What is upward?
Felicia the ballet dancer has a mass of 45 kg on Earth. Her mass on the surface of Jupiter, where gravity is 25 m/s/s , is this value.
What is 45 kg?
On a flat horizontal surface, the two factors that determine the strength of sliding kinetic friction are the material coefficient and this upward support force.
What is the normal force?
A 1-kg cart on a table is pulled by a hanging 1-kg (10-N) iron weight draped over a pulley. The system's acceleration is this value.
What is 5 m/s/s?
Between a 100 kg and 150 kg skydivers, this one will stay in the air the longest.
For a box resting on a ramp inclined at angle theta, the normal force vector is equal and opposite to this mathematical component of the weight vector
What is m*g*cos(theta)?