Mechanical Equilibrium
what is needed to change an object's state of motion
What is a force
average speed is calculated by ?
What is total distance/time
If the distance between two objects is doubled, the force is _________
decreases by 4
The equation for calculating Work.
What is force x distance.
collision where a car crumples on impact
What is inelastic
If someone is pushing down on a tire swing that is not moving with 250 N of force, the upward force is equal to _________?
250 N of tension force
acceleration is ?
What is change in speed/time interval
what geometric theorem is used to solve the addition of perpendicular vectors
What is Pythagorean theorem
When work is done on an object is gains this.
What is mechanical energy?
why does a cannon recoil when fired
What is momentum is conserved, so the momentum the cannon is equal and opposite of the cannonball
stretching force associated with springs and pulleys
What is tension
slows the motion of falling objects
What is air resistance
downward motion of a projectile is the same as _______
What is free fall
The 2 types of mechanical energy.
What are Potential energy and Kenetic energy.
which crash is more survivable and why? a car that hits a tree or a car hits bridge with 10 barrels of sand in front
What is bridge abutment with sand barrels because the sand decreases the momentum to zero over a longer period of time
for equilibrium to occur, the sum of all forces must equal
What is zero
another name for deceleration
What is negative acceleration
when bowling, is the bowling ball a projectile and why or why not.
What is no, it has no vertical motion only horizontal motion.
The equation for the law of conservation of energy.
What is PE1 + KE1 = PE2 + PE2
which boxing gloves hit harder & why 6 oz gloves 16 oz gloves
What is 6 oz gloves because more padding allows momentum to be reduced to zero over a longer time.
upward force that balances a weight on a surface
What is support or normal force
instantaneous speed of a projectile = ______ x time
What is "g" or approx. 10
What is a projectile called when it continually 'falls' around the Earth?
What is a satellite?
The units for work and energy.
What are Joules.
what happens when 10 astronauts in a circle in space throw balls at each other
What is the circle widens or the astronauts are moved back