Question

period: ____ date: ____
laws of motion and forces: velocity, acceleration, momentum, and more
hs-ps2-1; hs-ps2-2, hs-ps2-3, hs-ps2-4
understanding how objects move and interact is a crucial part of physics. in this worksheet, you will explore important concepts such as velocity (how fast something moves in a certain direction), acceleration (how quickly velocity changes), and momentum (the product of mass and velocity). youll also learn about newtons three laws of motion, which describe how forces affect motion, as well as concepts like pressure, gravity, and weight. these ideas help explain everything from why you feel pushed back in a car when it accelerates, to how gravity keeps planets in orbit!

fill in the blank: fill in the blank with the correct words.

1. the rate at which an object changes its velocity is called _______________.
2. newton’s _______________ law states that for every action, there is an equal and opposite reaction.
3. the force that pulls objects toward the center of the earth is called _______________.
4. the amount of matter in an object is known as its _____________, while the force of gravity on that object is called its _____________.
5. the product of an object’s mass and its velocity is called _______________.

word bank: weight, mass, acceleration, third, gravity, momentum

multiple choice questions: choose the correct answer from the choices for each question.

1. which of the following best describes newton’s first law of motion?

○ a) forces come in pairs.
○ b) a change in motion is caused by unbalanced forces.
○ c) an object at rest stays at rest unless acted on by a force.
○ d) force equals mass times acceleration.

1. what is the unit of force in the metric system?

○ a) pascal
○ b) newton
○ c) watt
○ d) joule

Explanation:

Fill in the Blank Answers:

1. The rate at which an object changes its velocity is called acceleration. (Explanation: Acceleration is defined as the rate of change of velocity.)
2. Newton’s third law states that for every action, there is an equal and opposite reaction. (Explanation: Newton's Third Law of Motion describes action - reaction pairs.)
3. The force that pulls objects toward the center of the Earth is called gravity. (Explanation: Gravity is the gravitational force exerted by the Earth on objects near its surface.)
4. The amount of matter in an object is known as its mass, while the force of gravity on that object is called its weight. (Explanation: Mass is a measure of the amount of matter, and weight is the force due to gravity acting on that mass.)
5. The product of an object’s mass and its velocity is called momentum. (Explanation: The formula for momentum is $p = mv$, where $p$ is momentum, $m$ is mass, and $v$ is velocity.)

Multiple Choice Answers:

1. For the question "Which of the following best describes Newton’s First Law of Motion?":

• Option a: "Forces come in pairs" describes Newton's Third Law.
• Option b: "A change in motion is caused by unbalanced forces" is related to the concept of net force and acceleration (Newton's Second Law in a way, but not the best description of the first law).
• Option c: "An object at rest stays at rest unless acted on by a force" is a correct description of Newton's First Law (the law of inertia).
• Option d: "Force equals mass times acceleration" is Newton's Second Law ($F = ma$).
• So the answer is c) An object at rest stays at rest unless acted on by a force.

1. For the question "What is the unit of force in the metric system?":

• Option a: Pascal is the unit of pressure.
• Option b: Newton is the unit of force (derived from $F = ma$, where the unit of mass is kilogram and the unit of acceleration is $m/s^{2}$, so $1N=1kg\cdot m/s^{2}$).
• Option c: Watt is the unit of power.
• Option d: Joule is the unit of energy.
• So the answer is b) Newton

Answer:

Fill in the Blank Answers:

1. The rate at which an object changes its velocity is called acceleration. (Explanation: Acceleration is defined as the rate of change of velocity.)
2. Newton’s third law states that for every action, there is an equal and opposite reaction. (Explanation: Newton's Third Law of Motion describes action - reaction pairs.)
3. The force that pulls objects toward the center of the Earth is called gravity. (Explanation: Gravity is the gravitational force exerted by the Earth on objects near its surface.)
4. The amount of matter in an object is known as its mass, while the force of gravity on that object is called its weight. (Explanation: Mass is a measure of the amount of matter, and weight is the force due to gravity acting on that mass.)
5. The product of an object’s mass and its velocity is called momentum. (Explanation: The formula for momentum is $p = mv$, where $p$ is momentum, $m$ is mass, and $v$ is velocity.)

Multiple Choice Answers:

1. For the question "Which of the following best describes Newton’s First Law of Motion?":

• Option a: "Forces come in pairs" describes Newton's Third Law.
• Option b: "A change in motion is caused by unbalanced forces" is related to the concept of net force and acceleration (Newton's Second Law in a way, but not the best description of the first law).
• Option c: "An object at rest stays at rest unless acted on by a force" is a correct description of Newton's First Law (the law of inertia).
• Option d: "Force equals mass times acceleration" is Newton's Second Law ($F = ma$).
• So the answer is c) An object at rest stays at rest unless acted on by a force.

1. For the question "What is the unit of force in the metric system?":

• Option a: Pascal is the unit of pressure.
• Option b: Newton is the unit of force (derived from $F = ma$, where the unit of mass is kilogram and the unit of acceleration is $m/s^{2}$, so $1N=1kg\cdot m/s^{2}$).
• Option c: Watt is the unit of power.
• Option d: Joule is the unit of energy.
• So the answer is b) Newton