The Need for Speed
As Rhianna Says... Work, Work, Work
Simple is as Simple Does
There was this guy named Newton...
Energy Transformers
100
How do you measure speed? What about the formula for distance? What about time?
What is speed is a measure of the distance an object travels in a unit of time. D= s(t) T= d/t
100
What is work? (in physics)
What is the transfer of energy that occurs when a force makes an object move over a certain amount of distance.
100
Regarding machines, what is determined by comparing the input and output force?
What is a machine's mechanical advantage.
100
What is friction & name the 3 types?
What is a force that resists the motion of two surfaces that are touching. What is Static, Sliding, and Fluid Friction.
100
What is energy?
What is the ability to cause change.
200
What is the difference between speed and velocity?
What is velocity is the measure of speed and distance. Speed is measuring the ground and object has covered (travelled).
200
What is the SI unit of work and energy, AND what is it equal to (for candy)?
What is the joule... it is equal to 1 newton meter.
200
What is a device that makes doing something easier?
What is a simple machine.
200
What is fluid friction between and object and air called?
What is air resistance.
200
What is the difference between potential and kinetic energy?
What is potential energy is the stored energy of an object & kinetic energy is the energy of an object in motion. Think of your roller coaster design lab. How were both of those present? :)
300
When speed is constant, what does the distance-time graph look like?
What is the line on the distance-time graph is straight. (flat line)
300
What is power and provide the formula?
What is the rate at which work is done. Power is calculated by dividing the work done by the time needed to do the work. P = w/t
300
What are three ways that machines can make work easier?
What is (1) changing the size of a force, (2) changing the distance over which a force acts, and by (3) changing the direction of a force.
300
What is Newton's first law (Law of Inertia) and provide an example?
What is an object at rest, stays at rest, AND and object in motion stays in motion unless acted on by an outside force. Ex: (1) Hockey puck sliding on ice, stops due to fiction or player stops with hockey stick. (2) Pulling a piece of paper out from under a stack of books.
300
Which type of energy is the combo of the potential energy and kinetic energy of an object?
What is mechanical energy. Think of the marble in your roller coaster design.
400
What are two conditions that can chance when an object accelerates?
Acceleration is the rate at which velocity changes with time. What is an object accelerates when it's velocity changes -- speed and direction.
400
How can doing work on an object increase its kinetic energy?
Moving objects have kinetic energy, so causing an object to move increases its kinetic energy.
400
Albert Einstein applies an input force of 28 N to a broom. The broom has an output force of 14 N. What is the mechanical advantage of the broom?
What is 0.5. Broom = output force MA = 14 N/28 N
400
What is Newton's Second Law of Motion AND provide an example?
What is acceleration of an object is equal to the net force exerted on an object. The more mass the object has the more net force has to be used to move it. Ex: (1) Mama Rhino & Baby Rhino rolling in their chairs -- baby rhino is going further due to having less mass. (2) You have to apply less net force to push an empty shopping chart vs Costco supplies filled shopping cart.
400
What is the law of conservation of energy?
What is energy cannot be created or destroyed BUT can be transformed from one form to another.
500
Peyton and Coach Fulmer go to a raceway to watch Peyton's younger bother, Eli, compete. Eli's car covers 2.5 km in 12 seconds, reaching a speed of 180 km/h. Determine the rate of acceleration of Eli's car.
What is 15 m/s^2 (Hint: the initial velocity is 0 km/h) 180-0/12 = 15 m/s^2
500
If a leaf falls from a tree, has work been don on the leaf? Explain.... What verbs would not be considered doing work?
Yes, the force of gravity is PULLLLLLING the leaf down. Gravity is performing work on the leaf. What is carrying & holding.
500
What are the 6 types of simple machines and provide and example for each.
What is the lever, wheel & axle, the inclined plane, wedge, screw, and pulley 1. lever - seesaw, hammer 2. wheel & axle - wheels on a car, ceiling fan 3. inclined plane - ramp, slide, stairs 4. wedge - doorstop, shovel 5. screw jarlid, corkscrew 6. pulley - flagpole, curtain cord
500
What is Newton's third law and what are the two parts of a force pair?
What is for every action there is an equal and opposite reaction with the same momentum and opposite velocity. What is the action force and reaction force. Ex: Swimmer's hands and arms push against the water, producing an action force. water pushes back on swimmer, producing reaction force. swimmer propels forward.
500
What are the 4 main types of energy? (forget nuclear) Pick one to provide an example of and describe an energy transfer from one form to another.
What is thermal, chemical, radiant, and electrical. (1) Cook food in gas or electric stove. Gas stove = chemical energy to thermal energy. Electric stove = electric energy to thermal energy. (2) Chemical energy stored in the food you eat. Transformed into kinetic energy for movement & thermal for heat
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