WorksheetsAssessment 8 Review
Total questions: 27
Worksheet time: 15mins
What unit is used to measure work?
Joule
meter
newtons
effort
Which of the following will change when an inclined plane is used to lift a load?
only the weight of the load
only the effort needed to raise the load
only the distance the load moves
both the effort needed to raise it and the distance the load is moved
Which of the following is an inclined plane that lifts or splits apart and separates a load as it moves?
wheel and axle
pulley
lever
wedge
Which is an inclined plane wrapped around a rod?
wedge
pulley
screw
lever
Which is an example of a wheel and axle?
hammer
drill bit
scissors
door knob
About how much effort is needed to lift a load with a weight of 20 newtons by using a fixed pulley?
20n
40n
10n
100n
About how much effort is needed to lift a load with a weight of 20 newtons by using a movable pulley?
20n
5n
10n
40n
What kind of engineer designs and constructs machines involving motion?
mechanical
civil
electrical
chemical
What type of engineer designs and constructs bridges?
electrical
chemical
mechanical
civil
How much work is done if a load with a weight of 20 newtons is lifted 4 meters?
80J
120J
20J
100J
Check each tool that contains a wedge:
knife
paper clip
scissors
nail clippers
pencil sharpener
Which is the best description of the primary function of the paper clip?
fasten
measure
observe
cut
move
Which is the best description of the primary function of the hammer?
move
cut
measure
observe
Why do sleds and rollers make it easier to move a load?
they are fun to use
they reduce friction
they change the weight of the load
they work on rough and smooth surfaces
What are two ways machines can make work easier?
change the strength of a force, the direction of a force
you don't have to touch them
change the distance through which a force is applied
they change the weight of the load
The type of engineer who solves problems involving the production and use of chemicals
civil
mechanical
chemical
electrical
What are 3 ways machines can make work easier?
change the strength of a force
change the direction of a force
change the height the force moves
change the distance through which a force is applied
scissors are made of which two simple machines?
wedge and wheel
wedge and lever
wedge and screw
A hammer pulling a nail out of a board is an example of which kind of lever?
third class
first class
second class
What is the formula for finding how much work is done?
W= Force (N) x Distance (m)
W=newtons x force
W= meters x distance
W= effort divided by load
How do you find the effort needed to lift a load?
divide the weight of the load by the distance pulled
divide the weight of the load by the number of rope segments holding the load
multiply the distance the load is lifted by the number of rope segments
multiply effort times force
How do you find the distance the rope is pulled using a pulley or pulleys?
multiply the distance load is lifted by the number of rope segments holding the load
divide the weight of the load by the number of rope segments
multiply the load by the effort
What happens when gears of different sizes mesh?
they turn in opposite directions at the same speed
they turn same direction at same speed
they turn in opposite directions at different speeds
What happens when gears of the same size mesh?
they turn the same direction at the same speed
they turn in opposite directions at the same speed
they turn in the same direction at different speeds
Which best describes a first class lever?
fulcrum between the load and effort
load between the effort
fulcrum on the end of a lever
How are levers classified ,check each that apply?
according to location of the load
according to location of the fulcrum
according to the location of the effort
according to all of the above
Which best describes a third class lever?
effort between the fulcrum and the load
effort on the outside of the load
the effort on the handles
