e d g e - education for disability and gender equity

PHYSICS
CONTENTS

1 Work
2 Energy
3 Momentum
4 Center of Gravity
   
5 ACTIVITY
6 RESOURCES
   

SELF-TEST - TEXT VERSION
Read the question carefully, then select the answer:

1. In physics, is work is defined as a force acting upon an object to cause a movement?
YES      NO

2. Can mechanical energy be both kinetic energy and potential energy at the same time?
YES      NO

3. Is mechanical defined as the ability to do work?
YES      NO

4. Is an object with momentum easy or hard to stop?
EASY      HARD

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.
YES      NO

6. When pushed with equal force and in a similar wheelchair will a lighter or heavier person travel the greatest length?
LIGHTER      HEAVIER

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?
LARGE      SMALL

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.
BACK

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.
BACK

2 - YES: No, mechanical energy can be either kinetic energy (energy of motion) OR potential energy (stored energy of position).
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2 - NO: Correct - Mechanical energy can be either kinetic energy (energy of motion) OR potential energy (stored energy of position).
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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.
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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.
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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.
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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.
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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.
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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.
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6 - LIGHTER: Yes. The lighter person will travel farther when pushed with the same amount of force because he or she has less resistance.
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6 - HEAVIER: No. The heavier person has more resistance so the lighter person will travel farther when pushed with the same amount of force.
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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.
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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.
BACK


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