Forces Practice

What is the best physics definition of "Force" ?

• Force is the amount of energy in an object.
• Force is the speed of an object in motion.
• Force is an interaction that causes a change in the motion of an object. Basically, a push or a pull!

• Force is the weight of an object in a gravitational field.

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Why are the 4 Fundamental Forces called the "Non-contact Forces" ?

• They are called 'Non-contact Forces' because they can act over distances without physical contact.
• They are called 'Non-contact Forces' because they require direct interaction to function.
• They are called 'Non-contact Forces' because they only exist in a vacuum.
• They are called 'Non-contact Forces' because they can only act on objects that are touching each other.

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Match the following descriptions to each of the 4 Fundamental Forces

• Force that attracts two masses.

• Electromagnetic

• Force responsible for electricity and magnetism

• Weak Nuclear

• Force that holds protons and neutrons together

• Strong Nuclear

• Force responsible for radioactive decay

• Gravitational

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Categorize the given characteristics with each Fundamental Force.

Groups:

(a) Gravitational

,

(b) Electromagnetic

,

(c) Weak Force

,

(d) Strong Nulcear

• Responsible for electric and magnetic properties.

• Attractive force that exists between all objects.

• Responsible for radioactive decay

• Acts over the LONGEST distance

• WEAKEST force.

• Gives objects their abilities to bend, squeeze, twist, etc.

• Strongest force

• Despite, the name is actually very strong.

• Acts over the SHORTEST distance

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A bowling ball is rolled on a frozen lake, a frictionless surface. Because there is no force to stop the ball, it continues to roll. Which of Newton's Laws explains why?

• Newton's First Law of Motion
• Newton's Second Law of Motion
• Newton's Third Law of Motion
• Law of Universal Gravitation

You're in the car holding two extra large Diet Cokes. Suddenly, your mom slams on the brakes and your diet cokes go flying. Which of Newton's Laws explains why?

• Law of Universal Gravitation
• Newton's Third Law of Motion
• Newton's First Law of Motion
• Newton's Second Law of Motion

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A bowling ball has a large mass but is only accelerating at 2 m/s² . A ping pong ball has a low mass but is acceleration at 200 m/s². Which of Newton's Laws explain how they can have the same net force?

• Newton's First Law explains the motion of the bowling ball.
• Newton's Third Law states that every action has an equal and opposite reaction.
• Newton's Law of Universal Gravitation describes the attraction between the balls.
• Newton's Second Law (F = ma) explains how they can have the same net force.

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You're at the grocery store pushing the shopping cart over to the toothpaste section, which is your favorite aisle. When you push on the shopping cart, it pushes back on you. Which of Newton's Laws explains why?

• Newton's Law of Universal Gravitation
• Newton's Second Law of Motion
• Newton's Third Law of Motion
• Newton's First Law of Motion

What is the difference between the net force on an object and Action-Reaction pairs of forces?

• The net force is the force exerted by one object on another.
• Action-reaction pairs can exist without a net force acting on an object.
• The net force is always greater than action-reaction pairs.
• The net force is the sum of all forces on an object, while action-reaction pairs are equal and opposite forces acting on different objects.

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Mass measures​ (a)   and is measured in ​ (b)   . Weight measures the ​ (c)   exerted by the Earth on an object. It is measured in ​ (d)   .

• the amount of matter in an object
• kilograms
• gravitational force
• Newtons
• the volume of an object
• grams
• the density of an object
• pounds
• the temperature of an object
• liters

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