A spring force is an example of this type of force (conservative or nonconservative)
What is a conservative force
100
Give an example of when work on a system is nonzero
What is (answers vary) when the potential energy of the system increases
100
Give one formula for power
What is P=W/t
What is P=Fv cos0
100
Nathan knocks a book off the 0.9 m high table and it falls to the floor. Joe picks it up and places it back on the table. What it the TOTAL change in gravitational potential energy of the book
What is 0 J
200
The SI unit for work
What is the Joule (J)
200
The equation for work done by a spring.
What is W=1/2*k*(x2-x1)
200
State the work-energy theorem
What is the work done on an object is equal to the change in the object's kinetic energy
200
List one factor that contributes to computing power
What is applied force, work done, or the angle between the applied force and displacement
200
If potential energy of a system is zero, and its total mechanical energy is nonzero this is true about the system
What is that the system is in motion
300
The SI unit for Power
What is the Watt (W)
300
A spring is compressed 10 cm with a force of 3.2 N. This is the spring constant.
What is 32 N/m
300
Jon pushes a lawnmower with a force of 50.0N directed at 50 degrees from the horizontal. The total distance the lawnmower moves is 90.0m. How much work did Jon do with the lawnmower
What is 2892 J
300
Jon pushes a lawnmower with a force of 50.0 N directed at 50 degrees from the horizontal. The total distance the lawnmower moves is 90.0 m. If Jon took 10 minutes (10 minutes=600 s) to mow 90 m of grass, what was his power
What is 4.82 W
300
If the velocity of a system is initially 12 m/s and the system accelerates to 24 m/s, by what factor will its kinetic energy increase
What is by a factor of 4
400
The unit for a spring constant (k)
What is a N/m
400
The force it takes to stretch a spring is in the (opposite or same) direction as the force exerted by the spring
What is the opposite direction
400
While walking through an orchard on a windy day, you see a 255 g apple hanging from a branch 10 m above the ground. A wind gust causes the apple to fall. You catch it at a height of 1.5 m from the ground. Calculate the work done by gravity.
What is 21.2 J
400
A 255g apple is hanging 10m above the ground. A wind gust causes the apple to fall. You catch it at a height of 1.5 m from the ground. Calculate the gravitational power on the apple during the fall if it takes 1.31 s to reach the ground.
What is 16.2 W
400
How much will the kinetic energy of a school bus increase if its velocity is tripled
What is by a factor of 9
500
The unit for Potential Energy
What is the Joule (J)
500
Chuck weighs 500 N on a bathroom scale containing a heavy spring. The spring is compressed 1.25 cm under his weight. Find the total work done on the spring during the compression
What is 3.12 J
500
Under these conditions only may the formula U=mgh be used to find gravitational potential energy of a system
What is only when the system is near the earth's surface
500
This is actually an energy problem! A 0.35 kg ball falls from a porch deck to the ground 3.3 m below. What is its speed when it hits the ground? Disregard air resistance.
What is 7.7 m/s
500
By what factor is the kinetic energy increased when the speed of a car is increased from 30 m/s to 50 m/s