WorksheetsAKS 5a. Conservation of Energy
Total questions: 9
Worksheet time: 45mins
As an object is falling, its ___ energy turns into ___ energy.
Gravitational Potential ; Kinetic
Kinetic ; Gravitational Potential
Thermal ; Kinetic
Total ; Potential
A frictionless pendulum is swinging back and forth. Where does the pendulum have the least kinetic energy?
At its highest point.
At its lowest point.
Half-way between the highest and lowest point
It has the same Kinetic energy all the time
A frictionless pendulum is swinging back and forth. Where will the pendulum have the most TOTAL energy?
At its highest point.
At its lowest point.
Half-way between the highest and lowest point.
It has the same Kinetic energy all the time
A book has 200J of potential energy and then it falls onto the floor. After it hits the floor and is sitting still, what happened to the energy?
It has disappeared.
It goes into the floor and book as thermal energy and sound.
It changes to chemical potential energy.
It turns into gravity.
Students conducted a pendulum experiment to demonstrate the conservation of energy principle. Below is a diagram showing the pendulum at different points of its swing. Which letter/s on the diagram would correspond to the point/s of the pendulum’s swing where there would be both potential and kinetic energy?
A & E only
B & D
C only
All points have both Kinetic and Potential
A student drops a bouncy ball from a height of 3m in her physics lab. How high will the ball bounce back up and why?
3m because the kinetic energy is greater than the potential energy
3m because the potential energy will be the same
Less than 3m because some of the starting energy is converted to thermal and sound energy.
Greater than 3m because the ball creates energy when it bounces
The skateboarder shown above has a potential energy of 2,800 J and kinetic energy of 0J at a height of 4 meters. How much total mechanical energy will she have after 2 seconds?
2000J
1600J
1400J
2800J
What is the formula for total mechanical energy?
KE + PE = TME
TME = 1/2 * mv
TME = mgh
TME= 1/2mv2 - mgh
If the skateboarder has 2000J of PE and 0J of KE at 4m, how much KE would she have at 2m high?
2000J
800J
1000J
0J
