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- 1. Multiple Choice
If a girl is climbing up a ladder while carrying a light bulb, is she doing any work?
yes, the object is moving in the direction of the force
yes, she has something in her hand
no, she is not moving the object
no, the bulb doesn't weigh enough to count
- 2. Multiple Choice
How much work is a cat doing if it is picking up a dead mouse (1N) off the ground? (.2m)
none, cats don't do work
none, the mouse is not alive
0.2 J of work
1.2 J of work
- 3. Multiple Choice
What is energy?
the ability to turn on a light
the amount of electricity needed to light one light bulb
the ability to do do work
the temperature of an oven when making brownies
- 4. Multiple Choice
How much power is used if 5 joules of work are done in 1 second?
0.5 watts
1/5 watts
5 watts
1 watt
- 5. Multiple Choice
Which has gravitational potential energy?
Elf on a shelf
tennis ball on the floor
roller coaster car at the bottom of the lowest hill
- 6. Multiple Choice
Which has elastic potential energy?
pencil on a desk
stretched rubber band
food on a plate
- 7. Multiple Choice
Which has chemical potential energy?
food on plate
gas in your car's gas tank
stretched rubber band
pencil on the desk
- 8. Multiple Choice
What is a simple machine?
a device that changes the force needed to lift an object
a device that changes the way work is done
a device that heats up food in 2 minutes
a device that increases the amount of force needed
- 9. Multiple Choice
If a fixed pulley has a MA of 1, how does it help us?
Decreases the amount of force needed to lift an object
Increases the amount of force needed to lift an object
Changes the direction of the force
Is not really helpful
- 10. Multiple Choice
The fulcrum on a 1st class lever is ...
on the left
on the right
in the middle
- 11. Multiple Choice
What is the unit for Mechanical Efficiency?
watts
joules
Newtons
%
- 12. Multiple Choice
What type of simple machine is a pair of scissors?
1st class lever
2nd class lever
3rd class lever
wheel and axle
- 13. Multiple Choice
A simple machine reduces the amount of work needed to accomplish a task.
true
false
depends on the machine
depends on the object being lifted
- 14. Multiple Choice
A screw with threads very close together is more efficient than one with them spread apart.
true
false
only in some cases
if it is made of steel
- 15. Multiple Choice
A cat is chasing a mouse down a hill. Select all that apply
The cat has potential and kinetic energy.
The mouse has potential and kinetic energy
Neither has potential energy
If they run at the same speed the cat has more potential energy than the mouse
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