Simple Machines, Work, and Energy Transformations
Authored by J HALL
Science
7th Grade
NCES covered
Used 61+ times
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15 questions
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1.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
A toy car requires a key to wind it up. When the key is released the toy car will move. When does the wind-up toy car have the greatest potential energy?
before it is wound
as it begins moving
just before it stops moving
after it is wound, but before it begins moving
Tags
NCES.7.P.2.1
2.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Assume that friction exists between the car’s wheels and the track. What will happen to the car’s mechanical energy as it moves from W to X?
The car’s mechanical energy will increase.
The car’s mechanical energy will decrease.
The car’s mechanical energy will remain the same.
Not enough information is given to know the mechanical energy of the car at W or X.
Tags
NCES.7.P.2.1
3.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Assume there is no friction between the ball and the ramp. Which statement describes the ball’s mechanical energy as it moves down the ramp?
The mechanical energy increases.
The mechanical energy decreases.
The mechanical energy remains the same.
Not enough information is given to determine the ball’s mechanical energy.
Tags
NCES.7.P.2.1
4.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Between what two locations does the car’s kinetic energy transform into potential energy?
W and X
W and Y
X and Y
Y and Z
Tags
NCES.7.P.2.2
5.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
In the diagram, three marbles are resting on a ruler. Marble 1 is pushed and it hits marble 2. Marble 2 then hits marble 3. Marble 3 rolls off the ruler. What can be inferred?
Energy was transferred from marble 1 to marble 2 to marble 3.
Energy was transferred from marble 1 to marble 2 and then was immediately destroyed.
Energy was transferred from marble 1 to marble 2. New energy was then created and caused marble 3 to move.
Energy was lost after marble 1 moved. New energy was then created and transferred from marble 2 to marble 3.
Tags
NCES.7.P.2.3
6.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Which yard tool has a wheel and axle that helps move a pile of dirt?
Tags
NCES.7.P.2.4
7.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
How do simple machines make it easier to move an object?
They multiply the resistance to the applied force on the object.
They maintain the direction in which the force is applied on the object.
They increase the amount of force that needs to be exerted on the object.
They decrease the amount of force that needs to be exerted on the object.
Tags
NCES.7.P.2.4
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