e d g e
- education for disability and gender equity
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SELF-TEST - TEXT VERSION 1. In physics, is work is defined as a force acting
upon an object to cause a movement? YES NO 3. Is mechanical defined as the ability to do work? 4. Is an object with momentum easy or hard to stop?
5. Is this a true statement?: A wheelchair rider wants
to have a center of mass that allows for the greatest use of arm energy
while maintaining the lowest center of gravity. 6. When pushed with equal force and in a similar wheelchair
will a lighter or heavier person travel the greatest length? 7. When encountering a bump going down a slope, will
a wheelchair with large or small front wheels be more likely to stop
and throw the rider out of the wheelchair? ANSWERS: 1 - YES: That's correct. In order for a force to
qualify as having done work on an object, there must be a movement and
the force must cause the movement. 1 - NO: Incorrect. Work IS defined as a force acting
upon an object to cause a movement. In order for a force to qualify
as having done work on an object, there must be a movement and the force
must cause the movement. 2 - YES: No, mechanical energy can be either kinetic
energy (energy of motion) OR potential energy (stored energy of position). 2 - NO: Correct - Mechanical energy can be either
kinetic energy (energy of motion) OR potential energy (stored energy
of position). 3 - YES: Mechanical energy is often defined as the
ability to do work. Any object which possesses mechanical energy - whether
it be in the form of potential energy or kinetic energy - is able to
do work. 3 - NO: Actually, it's true that mechanical energy
is often defined as the ability to do work. Any object which possesses
mechanical energy - whether it be in the form of potential energy or
kinetic energy - is able to do work. 4 - EASY: No, an object with momentum is going
to be hard to stop. It requires a greater amount of force or a longer
amount of time (or both) to bring an object with more momentum to a
halt. 4 - HARD: Yes, an object with momentum is going
to be hard to stop. It requires a greater amount of force or a longer
amount of time (or both) to bring an object with more momentum to a
halt. 5 - YES: Correct. A wheelchair rider wants to have
a center of mass that allows for the greatest use of arm energy while
maintaining the lowest center of gravity. 5 - NO: Incorrect, a wheelchair rider wants to have
a center of mass that allows for the greatest use of arm energy while
maintaining the lowest center of gravity. 6 - LIGHTER: Yes. The lighter person will travel
farther when pushed with the same amount of force because he or she
has less resistance. 6 - HEAVIER: No. The heavier person has more resistance
so the lighter person will travel farther when pushed with the same
amount of force. 7 - LARGE: No. When encountering a bump on a down
slope the size of the front casters is important. The wheelchair with
the smaller front caster is more likely to get caught on the bump and
cause the person to fall forward out of the wheelchair. 7 - SMALL: Correct. Yes. When encountering a bump
on a down slope the size of the front casters is important. The wheelchair
with the smaller front caster is more likely to get caught on the bump
and cause the person to fall forward out of the wheelchair. |
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