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Academic Bowl. Force, motion, and others. If a bus is moving 15 m/s east and a person inside is walking 1 m/s west, what is the velocity of the person? 14 m/s east If a tornado is in the area, would you rather know its speed or velocity? Velocity. Scientists express force using what unit?
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Academic Bowl Force, motion, and others
If a bus is moving 15 m/s east and a person inside is walking 1 m/s west, what is the velocity of the person? • 14 m/s east • If a tornado is in the area, would you rather know its speed or velocity? • Velocity
Scientists express force using what unit? • Newtons • A cat is pushing a stroller with a force of 45 N, and it doesn't move. Is it considered work? • No, because the stroller didn’t move. • When forces on an object produce a net force of 0 N, The forces are called what? • Balanced forces. • Playing a soccer game is an example of what force? • Unbalanced forces • Does decreasing the surface area of an object (where it is touching another surface) reduce the friction? • No
What is kinetic friction? • Friction between moving surfaces • A dust mite is trying to push a cinderblock refrigerator across the room, and it doesn't move. What type of friction keeps it immobile? • Static friction • Is adding lubrication to a bicycle chain productive, unproductive, or neither? • Productive (less friction, it is useful so that the bike chain does not overheat and damage the bike or melt the bike although you must be moving very fast, on the sun to melt that) • A chandelier is dangling from the ceiling, is an example of what force? • Balanced forces
Newton's first law of motion in one word • Inertia • Define the first law of motion • An object at rest tends to stay at rest, and an object in motion tends to stay in motion and continue at a constant speed unless acted upon by an outside force. • State the tertiary corollary of the mathematician associated with all forces. • Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first.
Is walking to school with your 100N book bag considered work? • NO! • What is the difference between force and work? • Work involves displacement of an object whereas force does not require it to be present. • What is the formula for work? • W= F×d • Work is expressed in what unit? • Joules • What is power? • The corrupter of all! • Not really. How fast work is done.
What is the formula for power? • P=W/t • What is the unit power is expressed in? • Watts! • What is a machine? • A device that makes work “easier” by changing the input force in direction or size. • Machines allow force to be applied over _____ distance, which means that ______ force will be needed for the ______ amount of work. • Greater, less, same. • Explain the force-distance tradeoff. • The force-distance tradeoff states that the amount of work done is always constant, implying then, that when the distance is increased, the force is then weakened.
What is the equation for mechanical advantage? • MA= output force/input force • How many types of simple machines are there? • 6! • A lever requires what three components? • A load, fulcrum, and input force. (the bar for the lever is understood) • An example of a second class lever if you please? • Wheelbarrow, bottle-opener, and etc. • What are the 3 types of pulleys? • Fixed, movable, and block and tackle.
A wedge is a pair of what placed back to back? • Inclined planes. • A screw is a ________wrapped around a________. • Inclined plane; cylinder. • Is a machine with a mechanical efficiency of 100% be possible? Why or why not? • No, it is not possible because all machines have moving parts. Moving parts always use some work input to overcome friction. • What makes up a compound machine? • Several simple machines put together.
