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WorksheetsWork and MA
Total questions: 34
Worksheet time: 3hrs 50mins
What is effort (input) force?
the force one exerts on a machine
the force which an effort force must overcome in order to do work on an object via a simple machine.
the force the machine exerts on a object
the output work times the input distance
A teacher applies a force to a wall and becomes exhausted.
A rocket accelerates through space.
A lever used to lift a heavy box has an input arm of 4 meters and an output arm of 0.8 meters. What is the mechanical advantage of the lever?
1
2.5
5
10
What is the mechanical advantage of a lever that has an input arm of 3 meters and an output arm of 2 meters?
1.5
1
0.67
3
What is the mechanical advantage of this pulley?
1
2
3
4
What is the effort required to lift a load of 170 newtons using this pulley system?
57
114
85
90
An effort of 640 newtons is applied to this pulley system. What is the load that it will lift?
1280
1600
1920
2560
What is the mechanical advantage of this pulley system?
4
5
6
7
What is the mechanical advantage of this pulley?
2
3
4
5
What is the mechanical advantage of this pulley?
3
4
5
6
How much work is accomplished by moving a 600 N crate 7 m?
4,200 J
85.7 J
0.001 J
9,800 J
For work to be done on an object,
some force need only be exerted on the object.
the object must move some distance as a result of a force.
the object must move, whether or not a force is exerted on it
the object must not move.
If you apply 100 N of force to a crowbar to lift a 250 N rock, what is the mechanical advantage?
0.4
2.5
2,500
25,000
Lamar Gant, U.S. powerlifting star, became the first man to deadlift five times his own body weight in 1985. Deadlifting involves raising a loaded barbell from the floor to a position above the head with outstretched arms. Determine the work done by Lamar in deadlifting 300 kg to a height of 0.90 m above the ground (W=Fd).
270 J
2700 J
333 J
3.00X10-3 J
The bow (front) of a ship is actually a ________________.
Wedge
Pulley
Lever
Wheel and Axle
The ramp of a cargo jet is a(n) ______________
Lever
Pulley
Inclined plane
Wedge
Using a lever, Joe is able to lift a 10,000 N car off of the ground with a force of 1000 N. What is the mechanical advantage of the lever (MA=Output Force/Input Force)?
1
10
100
1000
Which of the lever would it take less force to lift?
Lever A
Lever B
How much effort would it take to lift Lever A?
60 N
50N
40 N
30 N
How much effort would it take to lift Lever B?
60 N
50 N
40 N
30 N
What is the mechanical advantage for this lever?
1
2
1/2
8
To increase the mechanical advantage of a lever
make sure the fulcrum is in the middle of the lever
move the fulcrum closer to the load
move the fulcrum closer to the person
use a bigger fulcrum
A simple machine has an input force of 12 N and an output force of 4 N. What is its mechanical advantage?
.33
3
8
16
What is the mechanical advantage of a lever that has an effort arm of 12 meters and an resistance arm of 6 meters?
2
72
0.67
3
