Work
Energy
Formulas
Trig Problems
Random
100
S.I. Unit for Work
What is Joules?
100
S.I. Unit of Kinetic Energy
What is Joules?
100
Formula for Work
What is Work = Force x Distance? or Force x Distance x cos theta?
100
Pythagoras Theorem
What is a2+b2=c2?
100
How much potential energy does a tennis ball on the ground have?
None
200
How much work is produced if the change in kinetic energy is 5J?
5J
200
Work-Energy Theorem
What is 'The net work done on an object is equal to the change in the object's kinetic energy'?
200
Formula for Kinetic Energy
What is Kinetic Energy= 1/2*mass*velocity^2?
200
Solve for a when 5a - 12 = 4a +3
a= 15
200
State the Law of Conservation of Energy
The total energy is neither increased or decreased in any process. Energy can be transformed from one form to another, and transferred from one object to another, but the total amount remains constant.
300
S.I Unit for Power
What is Watt?
300
Energy of an object due to its position
What is Potential Energy?
300
Formula for Gravitational Potential Energy
What is mass*gravity*height?
300
Calculate x (to 2 dp):
23.24
300
Does the total mechanical energy ever increase or decrease when conservative forces are acting?
No. This is the principle of conservation of mechanical energy for conservative forces. Mechanical energy stays constant - it is conserved (or a conserved quantity).
400
A 60 kg jogger runs up a long flight of stairs in 4.0 s. The vertical height of the stairs is 4.5 m. Calculate the jogger's power output in watts.
660 W
400
A 145 g baseball is thrown so that it acquires a speed of 25 m/s. Calculate its kinetic energy.
45 J
400
Formula for Power
What is Power (average) = Work done/time taken or energy transferred/time taken
400
A 75m zip line is attached to the top of a 50m building. If you are laying on the ground where the zip line reaches and are looking at your friend at the top of the building, what is the angle of elevation? (round to the nearest degree)
41.8° = 42° (round to the nearest degree)
400
Define Power
Power is the rate at which work is done, or the rate at which energy is transformed.
500
A person pulls a 50 kg crate 40 m along a horizontal floor by a constant force F=100 N, which acts at a 37°. Calculate the work done by this force. Ignore friction.
3200J
500
If I drop a rock from an original height of 3 m above ground, calculate the rock's speed when it has fallen to 1.0 m above the ground?
6.3 m/s
500
Formula for total mechanical energy
ME = KE + PE
500
Write sin θ , cos θ and tan θ in terms of the opposite, hypothenuese and adjacent of a right angle triangle?
sin θ = opp/hyp
cos θ =adj/hyp
tan θ =opp/adj =sinθ /cosθ
500
State the Four Kinematic Equations
v = v0+at
x= x0 + v0t + 1/2*a*t2
v2=v02 + 2a(x-x0)
v(avg)= (v+v0)/2