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A force acting on an object does no work if
Both 1 and 3
increasing the distance through which the force is applied
Increases its efficiency
the force is not in the direction of the object's motion
7.5 J
It converts some input energy into thermal energy
change the amount of work done.
1.5 m
As the temperature of an object rises so does the
Both 1 and 3
increasing the distance through which the force is applied
Increases its efficiency
the force is not in the direction of the object's motion
7.5 J
It converts some input energy into thermal energy
change the amount of work done.
1.5 m
A machine does work, it can do all of the following except
Both 1 and 3
increasing the distance through which the force is applied
Increases its efficiency
the force is not in the direction of the object's motion
7.5 J
It converts some input energy into thermal energy
change the amount of work done.
1.5 m
If you exert a force of 10.0 N to lift a box a distance of 0.75 m how much work do you do?
Both 1 and 3
increasing the distance through which the force is applied
Increases its efficiency
the force is not in the direction of the object's motion
7.5 J
It converts some input energy into thermal energy
change the amount of work done.
1.5 m
An inclined plane reduces the effort force by
Both 1 and 3
increasing the distance through which the force is applied
Increases its efficiency
the force is not in the direction of the object's motion
7.5 J
It converts some input energy into thermal energy
change the amount of work done.
1.5 m
Reducing friction in a machine
Both 1 and 3
increasing the distance through which the force is applied
Increases its efficiency
the force is not in the direction of the object's motion
7.5 J
It converts some input energy into thermal energy
change the amount of work done.
1.5 m
Why does friction decrease the efficiency of a machine ?
Both 1 and 3
increasing the distance through which the force is applied
Increases its efficiency
the force is not in the direction of the object's motion
7.5 J
It converts some input energy into thermal energy
change the amount of work done.
1.5 m
If you perform 30 J of work lifting a 20 N box from the floor to a shelf how high is the shelf?
Both 1 and 3
increasing the distance through which the force is applied
Increases its efficiency
the force is not in the direction of the object's motion
7.5 J
It converts some input energy into thermal energy
change the amount of work done.
1.5 m
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