Work
I lift a 20kg weight over my head to a height 2 meters. How much work have I done on the weight?
400J
I am holding a 2kg ball so that it has 40J of potential energy. How high am I holding said ball?
2m
According to Hooke's law, what will a Force x Distance graph look like of a spring being compressed?
Straight line in the positive. (positive slope)
If a 2 kg guinea pig is running at 1.0 m/s, what is the pig's kinetic energy?
1 J
I lift a 10 kg mass to a height of 3 meter in 2 seconds. How powerful am I while doing this? (UNITS COUNT)
150 W
The energy of a system increases from 30J to 50J. How much work was done on the system?
20J
A 3 kg ball has a kinetic energy of 50 joules after falling a fifth of its drop. From what height did it start?
1.67 meters
DAILY DOUBLE!
What color is Mr. Johnson wearing today?
Red/Mahogany
If a lion is chasing a gazelle, and they both have the same kinetic energy, which is going faster?
The gazelle
DAILY DOUBLE!
What is the name of the tallest grass on earth?
Bamboo
A bodybuilder is in the midst of a an intense training session. He is currently bench pressing a bar with a mass of 250kg. If he does six reps of this mass and his arms are 0.75m long, how much work has been done on the bar between the time the bar was removed from its rack and placed back on the rack?
0J
What is the mass of an airplane flying at a height of 2km if it has a potential energy is 50 MJ? (In Kg)
25000 Kg
How much force is needed to pull a spring with a spring constant of 20 N/m a distance of 25 cm?
5 N
I've got two identical balls. If I double the speed of one of them, what will be the difference in their kinetic energies?
4 times
Lindsay climbs a ladder with power output PL. Brian climbs the same ladder in the same amount of time with double the power output. How does Brian's total change in energy compare with Lindsay's?
Brian has double the change in energy (work)
A woman pulls on a 100% efficient pulley system with a force of 50 N to lift a 300 N mass off the floor. If she pulls down a length of 2 meters of rope, how much potential energy will the mass have?
100J
DAILY DOUBLE!
What is the most abundant element in the universe?
Hydrogen
A spring attached to the ceiling has a block of mass 2 kg attached to the other end. On Earth, the displacement of the spring when at equilibrium is 0.2 m. What is the displacement of the spring at equilibrium when this system is on a planet that has a gravitational acceleration of g=4 m/s^2
0.08 m
A few friends are having a water balloon fight. One friend throws a balloon of mass 2 kg at another friend on a ledge 5 m above him. If the balloon hits the second friend at a rate of 3 m/s, how much energy did the first friend expend throwing the balloon?
109 J
A 70-kg cyclist develops 210 watts of power while pedaling at a constant velocity of 7 meters per second east. What average force is exerted eastward on the bicycle to maintain this constant speed?
30 N
I push a 20kg box up a 20 meter ramp that is at 20 degrees from the horizontal with a force of 20 Newtons. How much work am I putting in?
400J
A hovering helicopter drops a 20 kg mass. Said mass hits the ground while going 52 m/s. How high up was the helicopter flying?
138 m
A car with a mass of 1000 kg has 4 shock absorbers, each 0.5 meters long. What does the spring constant have to be in order for the suspension of the car to work?
k = 9800 N/m
DAILY DOUBLE!
If a skydiver starts with 455,000 J of energy, what is the velocity of a 60.0 kg skydiver when they are 100m above the Earth's surface?
115 m/s
A 20 kg mass is moved with a 40 N force so that its kinetic energy reaches 500 J. How much power was used to do this?
282.84 watts