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7th Grade Semester 2 Final Review
Test Description: To help you study for your final!
Instructions: Answer all questions to get your test result.
1) According to Newton’s first law of motion, an object at rest will stay at rest and an object in motion will stay in motion unless acted upon by what?
A
An object with a large mass
B
An unbalanced force
C
Gravity
D
A brick wall
2) What is the equation we use with Newton’s second law of motion?
A
F = m - a
B
F = m + a
C
F = ma
D
F = m/a
3) Newton's 3rd law of motion says:
A
For every action, there is an unbalanced force.
B
Every object accelerates equally when dropped.
C
For every action, there is equal rest time.
D
For every action, there is an equal and opposite reaction.
4) When you are riding in a car and the car stops suddenly, you continue moving forward because of:
A
Inertia
B
Centripetal force
C
Friction
D
Gravity
5) What are the units for Force, mass, and acceleration?
A
Force = N mass = m/s2 acceleration = kg
B
Force = N mass = kg acceleration = m/s2
C
Force = kg mass = N acceleration = m/s2
D
Force = m/s2 mass = kg acceleration = N
6) Why is acceleration = 9.8 m/s2 so special?
A
This is the acceleration of objects experiencing a force
B
This is the acceleration of all objects in motion
C
This is the acceleration of all falling objects
D
This is the acceleration of all objects experiencing friction
7) What is the force that opposes motion called?
A
Free-body force
B
Friction
C
Oppositional force
D
The force of inertia
8) In physics, a push or a pull is called _______.
A
Inertia
B
Conserved energy
C
A force
D
A reaction
9) Objects will only move if forces are ______.
A
Unbalanced
B
Equal
C
Balanced
D
Conserved
10) A ball is sitting on flat ground. Someone pushes the ball once and it starts rolling. Why does the ball eventually slow down and stop?
A
The action force of the push is opposed by the reaction force.
B
The ball’s inertia takes over, slowing it down until it stops.
C
The force of friction slows the ball down until it stops.
D
The force of the push slowly wears off.
11) The balloon rocket experiment we did in class was a perfect example of: _____________.
A
All of the above
B
Newton's 2nd law of motion
C
Newton's 3rd law of motion
D
Newton's 1st law of motion
12) The law of conservation of energy states: ______________________.
A
Energy CANNOT be created, but CAN be destroyed
B
Energy CANNOT be created or destroyed, only transferred from one form to another.
C
Energy only exists as kinetic energy.
D
Energy CAN be created or destroyed.
13) Kinetic energy can also be called ____________.
A
Energy of motion
B
Energy of Newton’s Laws
C
Energy of heat transfer
D
Stored energy
14) According to the law of conservation of energy, what happens to light energy when you turn off a light switch?
A
Light energy is released into the room
B
Light energy is converted back into electrical energy
C
Light energy remains in the light bulb, but becomes invisible
D
Light energy is destroyed
15) An orange is hanging on a tree. The orange suddenly falls from the tree. That means the potential energy is being transformed into what type of energy?
A
Light
B
Sound
C
Potential
D
Kinetic
16) Potential or kinetic energy? -- An airplane flying through the air.
A
Kinetic
B
Potential
17) Potential or kinetic energy? -- A stretched rubber band
A
Potential
B
Kinetic
18) Potential or kinetic energy? -- A nuclear bomb sitting in its storage crate
A
Potential
B
Kinetic
19) Potential or kinetic energy? -- A baseball playing sliding into home plate.
A
Kinetic
B
Potential
20) Which of the following is NOT a form of heat transfer?
A
Nuclear
B
Radiation
C
Conduction
D
Convection
*select an answer for all questions
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