Two teams are playing tug of war. Team A pulls with a force of $$500 \text{ N}$$ to the right, and Team B pulls with a force of $$500 \text{ N}$$ to the left. What is the net force, and what happens to the rope?

Net force is $$0 \text{ N}$$ ; the rope does not move.

Net force is $$1000 \text{ N}$$ ; the rope moves to the right.

Net force is $$500 \text{ N}$$ ; the rope moves to the left.

Net force is $$0 \text{ N}$$ ; the rope moves to the right.

A box is being pushed across the floor with a force of $$50 \text{ N}$$ , but friction exerts a force of $$20 \text{ N}$$ in the opposite direction. What is the net force on the box, and in which direction does it move?

$$30 \text{ N}$$ in the direction of push

$$70 \text{ N}$$ in the direction of push

$$30 \text{ N}$$ opposite to the direction of push

$$50 \text{ N}$$ in the direction of push

A skateboarder pushes off the ground and moves forward. According to Newton's Third Law, what happens to the ground?

The ground receives an equal and opposite force from the skateboarder's foot.

The ground experiences no force because it is stationary.

The ground pushes the skateboarder backward with a greater force.

The ground absorbs the force and converts it to heat.

Why does a heavier object require more force to achieve the same acceleration as a lighter object, according to Newton's Second Law?

a larger mass requires a larger force for the same acceleration.

Heavier objects have more friction acting on them.

Mass and acceleration are directly proportional, so more mass means more force is needed.

Mass and force are inversely proportional, so more mass requires less force.

A rocket in space fires its engines and accelerates forward. Using Newton's Third Law, explain the mechanism that propels the rocket forward and why this works even in the vacuum of space.

The rocket expels gas backward with a large force; by Newton's Third Law, the gas pushes the rocket forward with an equal and opposite force, requiring no medium to push against.

The rocket pushes against the air around it; in space, there is no air, so rockets cannot move.

The rocket is pulled forward by gravity from distant planets; this works in space because gravity has infinite range.

The rocket's engines create a magnetic field that repels the ground; in space, this field interacts with Earth's magnetic field.

A squirrel sits on the ground and eats a donut. We know the forces on him must be balanced because...

the squirrel is not accelerating

The diagram below shows unequal opposing forces. Which way will the wagon move?

The cart will move to the right.

The wagon will move to the left.

The wagon will remain stationary.

The wagon will move left and then right and then stop.

A wheeled cart is moving to the right at a constant speed. Two forces of equal magnitude are acting upon the cart. Which of the following best describes the forces and motion of the cart?

Balanced Forces, Constant Speed

Unbalanced Forces, Constant Speed

Unbalanced Forces, Acceleration

What is the reaction force to a foot pushing down on the floor?

The floor pushing back against the foot

The foot going through the floor

A swimmer pushes on the water and the water pushes on the hand and the swimmer moves forward. What is the ACTION force?

the water pushes on the hand and the swimmer moves forward

If the gymnast decreases the force they exerts on the trampoline, what will the reaction be?

The gymnast will be pushed back by the trampoline with less force and not go as high into the air

The gymnast will be pushed back by the trampoline with more force and go higher into the air

No change will happen to the gymnast

An astronaut kicks a soccer ball in outer space at a location far from significant influences of gravity and air resistance. The soccer ball will _________.

continue in motion with the same speed and direction

eventually stop as its inertia slowly becomes used up

eventually stop since all objects ultimately "lose their steam"

either a, b, or c -- depending on whether the astronaut continues to kick it

Newton's Laws of Motion with Balanced and Unbalanced Forces

Authored by Brooke Barksdale

Physics

8th Grade

NGSS covered

Used 7+ times

Newton's Laws of Motion with Balanced and Unbalanced Forces

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does Newton's First Law of Motion state?

An object accelerates in the direction of the net force applied to it.

For every action, there is an equal and opposite reaction.

An object at rest stays at rest, and an object in motion stays in motion unless acted upon by an unbalanced force.

Force equals mass times acceleration.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the formula for Newton's Second Law of Motion?

Tags

NGSS.MS-PS2-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following best describes Newton's Third Law of Motion?

Objects in motion tend to stay in motion.

The acceleration of an object depends on its mass.

For every action force, there is an equal and opposite reaction force.

Friction always stops a moving object.

Tags

NGSS.MS-PS2-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the term used to describe the resistance of an object to any change in its state of motion?

Friction

Gravity

Inertia

Momentum

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is an example of balanced forces acting on an object?

A soccer ball rolling to a stop on grass.

A book resting on a table with gravity and normal force equal in magnitude.

A rocket launching into the sky.

A car accelerating on a highway.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Tags

NGSS.MS-PS2-2

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Newton's Laws of Motion with Balanced and Unbalanced Forces

What does Newton's First Law of Motion state?

What is the formula for Newton's Second Law of Motion?

Which of the following best describes Newton's Third Law of Motion?

What is the term used to describe the resistance of an object to any change in its state of motion?

Which of the following is an example of balanced forces acting on an object?

A skateboarder pushes off the ground and moves forward. According to Newton's Third Law, what happens to the ground?

Which one is balanced?

Why does a heavier object require more force to achieve the same acceleration as a lighter object, according to Newton's Second Law?

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