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7th Grade Science Common Exam Review
Test Description: Part 8
Instructions: Answer all questions to get your test result.
1) Describe the energy transformation that occurs as a force acts on a mass at point A and causes it move to point B.
A
potential energy is converted into kinetic energy
B
Chemical energy is converted to electromagnetic energy
C
Kinetic energy is converted to potential energy
D
Gravitational Energy is converted to chemical energy
2) A boy is trying to walk his dog West. However, the dog resists the force applied by the boy and instead moves East. Which of the following best describes the forces in this situation?
A
the forces are balanced and the dog is stronger than the boy
B
the forces are balanced and the net force is zero
C
the forces are unbalanced and the dog's force is greater
D
the forces are unbalanced and the boy's force is greater
3) An airplane flies in a straight line between two cities that are separated by 840 kilometers. If it takes 4 hours for the airplane to take the trip, what is its average speed?
A
105 km/h
B
84 km/h
C
180 km/h
D
210 km/h
4) A student is organizing a room. She moves a box from the floor to a shelf. She wants to estimate the amount of potential energy the box has on the shelf. What information does she need?
A
the volume and mass of the box
B
the volume of the box and height of the shelf
C
the mass of the shelf and mass of the box
D
the mass of the box and height of the shelf
5) When does an object that is thrown up in motion have the least kinetic energy?
A
when it is first thrown
B
when it changes direction
C
at the midway point of its path up
D
at the midway point of its fall
6) Where does one look on a graph to find when an object has the greatest average speed
A
in the middle of the lines way down on the graph
B
in the middle of the lines way up on the graph
C
at the lowest point of the line on the graph
D
at the highest point of the line on the graph
7) How can simple machines makes work easier?
A
by adding more work on the object than originally applied
B
by decreasing the force needed to complete the task
C
by removing the force of gravity on the object
D
by increasing the friction between the machines and the object
8) Which simple machine increases the distance over which a load travels in order to reduce the needed force?
A
pulley
B
wheel and axle
C
inclined plane
D
wedge
9) Which simple machines are used to form a wheelbarrow?
A
lever, wheel and axle
B
wedge, wheel and axle
C
inclined plane, wedge
D
lever, pulley
10) Which simple machine would be the most efficient for lifting an object 30 m off the ground?
A
screw
B
pulley
C
lever
D
wedge
*select an answer for all questions
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