This Formative will cover Unit 3.2-3.5
This Formative will cover Unit 3.2-3.5
What does the law of conservation of energy state?
Stored energy is also known what kind of energy?
Energy of motion is also referred to as what type of energy?
Which formula describes each type of energy
| Draggable item | arrow_right_alt | Corresponding Item |
|---|---|---|
KE (kinetic energy) | arrow_right_alt | =mgh |
PE (potential energy) | arrow_right_alt | =1/2(m)(v)2 |
A tennis player strikes a tennis ball from underneath with her racket. The ball is sent straight up with an initial velocity of 19 m/s. How high above the striking point will the ball travel? Include units.
A photographer sitting near the open door of a news helicopter accidentally drops his 140-g mobile phone out the door at an altitude of 990m. How fast will the phone be falling when it strikes the ground? Include units.
Match the following equations to the correct type of energy they must calculate
| Draggable item | arrow_right_alt | Corresponding Item |
|---|---|---|
Electric Potential Energy | arrow_right_alt | |
Change in Gravitational Potential Energy | arrow_right_alt | |
Elastic Potential Energy | arrow_right_alt |
A boy with mass 25 kg climbs into a small tree. He sits on a branch that is 2.0 meters above the ground. What is his gravitational potential energy with respect to the ground?
A cat with mass 4.0 kg jumps down to the floor from a bookcase 2.0 m high. What is the cat's change in gravitational potential energy? Include Units
To store stacks of clean plates, a cafeteria uses a closed cart with a spring-loaded shelf inside. Customers can take plates off the stack one at a time through a hole in the top. A stack of plates compresses the spring 0.40 m. The spring constant is 240 N/m. What is the elastic potential energy of the spring? Include units.
Customers take plates from the same cart as question 21. As a result, the spring moves up to be compressed by only 0.30 m. What is the change in elastic potential energy. Include units.
A fixed source charge particle of 4.1 nC and a second particle with charge 2.4 nC are separated by a distance of 3.5 cm. What is the electric potential energy between the particles? And if the second particle is released, will it move toward or away from the source charge? Include units.
A toy cannon launches a 46-g golf ball straight up into the air with a kinetic energy of 6.8 J. What must be the ball's velocity be as it leaves the cannon? Include units.
A hockey player shoots a puck across the ice with kinetic energy 63 J and velocity 28 m/s. What is the mass of the puck in grams? Include units.
Match the type of system with the correct description.
| Draggable item | arrow_right_alt | Corresponding Item |
|---|---|---|
Isolated System | arrow_right_alt | Mass cannot enter or leave the system, but energy is free to enter or leave the system |
Closed System | arrow_right_alt | Both mas and energy can enter or leave the system. |
Open System | arrow_right_alt | Neither energy nor mass can enter or leave the system. |
A reversible process is one that can be done in reverse without changing the total energy of the system, which in reality, does not exist due to what factors?
Match key vocabulary with their definitions (use the glossary in DE to assist if necessary)
| Draggable item | arrow_right_alt | Corresponding Item |
|---|---|---|
magnetic field | arrow_right_alt | a current flows through a substance when light hits its surface; also known as the Hertz effect |
frequency | arrow_right_alt | a set of lines that defines the motion of charged particles near each other |
electromagnetism | arrow_right_alt | a wave that can transport its energy through a vacuum i.e. space |
electric field | arrow_right_alt | a set of forces due to stationary or moving electric charges |
voltage | arrow_right_alt | the number of waves that pass a given point during a specified period of time |
photoelectric effect | arrow_right_alt | a distribution of electrons within a conductor caused by a varying magnetic field |
electromagnetic wave | arrow_right_alt | a set of lines that defines the motion of charged particles near a magnet |
induction | arrow_right_alt | a measure of the electrical potential difference between two points |
What type of wave are electromagnetic waves?
What element is the video referring to?
Why can't we 'harvest' (that is to say, why can't we get) hydrogen from the atmosphere (air)?
Instead of getting hydrogen from air, we can get it from water by splitting hydrogen from oxygen...but there's one problem...what is that problem?
What is the solution the speaker is suggesting for producing hydrogen with the least amount of energy?