Levers
Inclined Planes and Modified Inclined Planes
Wheel & Axle, Gears
Other Simple Machines
Projectile Motion
100
True or False: The point around which a lever rotates is called the arm of the lever. (If False, write the correct word!)
False. The point around which a lever rotates is called the fulcrum of the lever.
100
Which of the following tools is a wedge? A) screw B) bottle opener C) wheelbarrow D) knife
D) knife
100
A ______ is a modified form of the wheel and axle that has two wheels of different sizes with interlocking teeth. A) wheelbarrow B) pulley C) gear D) screw
C) gear
100
What is the simple machine that combines a grooved wheel & axle and a rope?
Pulley.
100
(T/F) The time a golf ball is in the air and its height are greatest when the ball is fired at an angle of 45 degrees.
True
200
A lever is an example of a machine that __________. A) increases the distance an object moves B) decreases the work required to move an object C) is complex and has many moving parts D) increases the force applied to an object
B) decreases the work required to move an object
200
How does a ramp make it easier to move a heavy object a certain distance? A) by decreasing the distance the object moves B) by decreasing the amount of work required to move the object C) by changing the direction in which the object moves D) by decreasing the amount of force required to move the object
D) by decreasing the amount of force required to move the object
200
In a gear system, compared the smaller gear, the larger gear turns A) Faster B) Slower C) Same Speed D) Does not turn at all
B) Slower
200
How do you calculate the mechanical advantage of a pulley?
MA of pulley= number of pulley systems = number of ropes holding the load
200
True or False: The horizontal distance a projectile travels is called its trajectory. (If False, write the correct word!)
False: The horizontal distance is called range.
300
The mechanical advantage of a lever is the ratio of the: A) length of the input arm to the length of the output arm. B) length of the output arm to the distance the object moves. C) input force to the output force. D) input force to the distance the object moves.
A) length of the input arm to the length of the output arm.
300
The simple machine that operates as a ramp that curves around a shaft is a: A) rope and pulley system. B) lever. C) screw. D) gear.
C) screw.
300
If the radius of the wheel is 6ft and the radius of the axle is 3ft what is the mechanical advantage of the wheel?
MA= radius of wheel/radius of axle = 6ft/3ft= 2
300
Which simple machine does a flagpole make use of? A) inclined plane B) lever C) pulley D) screw
C) Pulley
300
The distance a projectile travels is dependent upon: A) air resistance B) launch angle C) launch speed D) all of the above
D) all of the above
400
Calculate: The mechanical advantage of a lever that has input arm of 50meters and output arm of 5 meters.
MA= 50m/5m = 10
400
Calculate the mechanical advantage of a ramp that is 2 meters high and 10 meters long.
MA= Length/Height= 10m/2m= 5
400
If the larger gear with 30 teeth turns once, the smaller gear with 10 teeth turns how many times?
The smaller gear will turn faster exactly three times.
400
True or False: Pulleys make work easier by distributing the force along the ropes. (If False, write the correct word!)
True
400
Of the following, the one that would NOT be considered a projectile is a: A) crow flying between trees. B) football thrown by a high school quarterback C) tennis ball hit by a star tennis player D) fox jumping over a wall
A) crow flying between trees
500
Categorize these tools into the correct class of levers (Must get all three correct for points): • See-Saw • Wheel Barrow • Shovel
• See-Saw : 1st Class Lever • Wheel Barrow : 2nd Class Lever • Shovel : 3rd Class Lever
500
Calculate the mechanical advantage of a screw if the circumference is 10mm and the lead is 1mm.
MA= circumference/lead= 10mm/1mm=10
500
If the input gear has 32 teeth and the output gear has 8 teeth what is the gear ratio?
Gear Ratio= input gear/output gear= 32/8= 4
500
Using a pulley system, Adam lifts a 400 kg load by putting an effort for 80 kg. How many pulleys are there in the system? (Hint, divide!)
400kg/80kg=5 pulleys
500
A stunt car driver traveling at 30 meters per second drives his car off a 20 meter high cliff as illustrated in the diagram: How far from the base of the cliff does the car hit? A) 41 meters B) 61 meters C) 82 meters D) 122 meters
B) 61 meters
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