
Unit 4 Review
Authored by DANIEL FLORES
Science
12th Grade
NGSS covered
Used 51+ times

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49 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the formula for work?
W= Fd
W= f/d
W= f/t
W= Ft
Answer explanation
The formula for work (W) is defined as the product of force (F) and distance (d) moved in the direction of the force. Therefore, the correct choice is W= Fd.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Imagine a man lifting a brick repeatedly in the air. How much work does he do with each lift if he lifts it 6.0 m and exerts an average force of 187 N?
2211 J
1122 J
0.03208 J
31.17 J
Answer explanation
Work is calculated using the formula: Work = Force x Distance. Here, Work = 187 N x 6.0 m = 1122 J. Therefore, the correct answer is 1122 J.
Tags
NGSS.MS-PS3-4
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the formula for power?
P = t/W
P = Wt
P = W/t
P = t/d
Answer explanation
The formula for power (P) is defined as the work done (W) divided by the time (t) taken to do that work. Therefore, the correct formula is P = W/t, which indicates how quickly work is done.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Calculate MA: input force = 6.3 N; output force = 8.6 N
0.73
54.18
14.9
1.37
Answer explanation
Mechanical Advantage (MA) is calculated as output force divided by input force. Here, MA = 8.6 N / 6.3 N = 1.37. Thus, the correct answer is 1.37.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What are the six types of simple machines?
lever, the fulcrum, the wheel and axle, the inclined plane, the wedge, and the screw
lever, the pulley, the wheel and axle, the inclined plane, the faucet, and the nail
lever, the fulcrum, the wheel and axle, the inclined plane, the wedge, and the nail
lever, the pulley, the wheel and axle, the inclined plane, the wedge, and the screw
Answer explanation
The correct answer lists the six types of simple machines: lever, pulley, wheel and axle, inclined plane, wedge, and screw. Other options incorrectly include terms like 'fulcrum' or 'faucet' which are not types of simple machines.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What two simple machines make up a pair of scissors?
Two levers and a fulcrum
Two levers and a nail
Two axles and a wheel
Two inclined planes and a nail
Answer explanation
Scissors consist of two levers (the blades) that pivot around a fulcrum (the screw or pivot point). This allows them to cut effectively by applying force at the handles to the blades.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Simple machines are divided into two families, what are they?
Pulley family and Inclined plane family
Pulley family and Wedge family
Lever family and Inclined plane family
Inclined plane family and Wedge family
Answer explanation
Simple machines are categorized into two families: the Lever family and the Inclined plane family. These families encompass various types of simple machines that help in performing work more efficiently.
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