Vocab
What is Work, Force, and Distance measured in and what is the formula.
Work is measured in Joules, Force is measured in Newtons, and Distance is measured in Meters. The formula is W=FxD
What is an inclined plane and an example.
An inclined plane is a flat surface that is raised at an angle, it reduces force needed.
Ex. a ramp
What is energy.
Energy is the ability to do work.
Describe how elastic energy is stored and released.
Energy is stored when you stretch the object, and when you stop stretching it and release it, the energy is released.
. Identify which of the following situations involve work being done:
1.Holding a book in the air
2. Pushing a shopping cart
3. Carrying a backpack up the stairs
4. Standing still while holding a dumbbell
What is kinetic and potential energy.
Kinetic energy is energy of motion and potential energy is energy that is saved or stored for later.
What is a edge and an example.
A wedge is a triangular shaped toll that is used to split or separate objects.
Ex. A knife
What does the Law Conservation of Energy state.
The Law Conservation of Energy states that energy cannot be created or destroyed.
How does a roller coaster demonstrate the conversion between potential and kinetic energy.
When you are at the top of a roller coaster, you have the most potential energy and when it goes down the potential energy converts into kinetic energy.
Explain two ways to increase power.
By using a simple machine and a compound machine.
What is a simple machine and compound machine.
A simple machine is a machine that makes work easier by changing the amount of force needed or the direction. A compound machine is a combination of two or more simple machines that work together to perform a simple task.
what is a lever and what is an example.
A lever is a Rigid bar that pivots around a fixed point called a fulcrum.
Ex. a wheelbarrow
How does Chemical Energy play a role in out daily lives? List 3 examples.
1. Gas in our car.
2. Food we put in our body
3. A battery
What happens to the energy of a ball when it rolls down a hill and then comes to a stop.
As the ball is rolling down the hill it has kinetic energy but as it comes to a stop, the kinetic energy turns in potential energy.
How is power different from work?
Power is the rate at which work is done and work is doing the same amount of work in less time.
What is Power, Work, and Time measured in and what is the formula.
Power is measured in Watts, Work is measured in Joules, and Time is measured in Seconds. The formula is P=Wxt
what is a wheel and axle and what is an example.
A wheel and axle is a simple machine consisting of a wheel attached to a shaft or axle.
Ex. a doorknob
What is elastic potential energy and give an example.
Elastic energy is energy that is stored in objects that can be stretched or compressed.
Ex. spring, rubber band
If 2 objects have the same speed but different masses, which one has more kinetic energy? Explain your answer.
The heavier object has more kinetic energy because when you have more mass the more kinetic energy you will need to be able to move the same speed of something with more mass and you would move faster because you have more mass and kinetic energy.
How do simple machines make work easier?
They can reduce/amplify force
What is a mechanical advantage and what is efficiency.
Mechanical advantage is a measure in efficiency of a machine in multiplying or changing the direction of a force. Efficiency is how quick the work is being done.
what is a screw and a pulley and give examples.
A screw is a simple machine that consist of a cylindrical shaft with a helical thread.
Ex. screws
A pulley is a wheel with a grove that holds a rope or cable.
Ex. flagpole system
What is all the energy and an example for each.
Kinetic energy is energy of motion. Ex. Running
Potential energy is energy that is saved or stored. Ex. Battery
Chemical energy is potential energy stored inside a bond. Ex. Food
Thermal energy is energy used to heat up objects. Ex. microwave
Electrical energy is in electric currents. Ex. Turning on a light
Electromagnetic and sound energy are both energy in waves. Ex. music and x-rays
Nuclear energy is used to harness the power of bonds holding molecules together. Ex. fusion, fission
If an object is lifted higher off the ground, how does it affect the objects potential energy?
It will have more potential energy because it will drop from higher up. The more we have to travel the more potential energy we have.
Explain why friction affects the efficiency of machines
Friction slows down machines making them less efficient. It also makes the object harder to move.