Carew-7.7 D Newton's 1st Law, Balanced & Unbalanced Forces Notes

Open Ended

Which of the following scenarios best demonstrates Newton's First Law of Motion (the law of inertia) and why?

Multiple Choice

Which of the following best explains why the box in the first image does not move?

• The forces acting on the box are balanced.

• There is no gravity acting on the box.

• The box is too heavy to move.

• There is no friction present.

Open Ended

What needs to happen to cause the box to move?

Open Ended

Based on images 2 and 3, explain how the forces acting on the box change to make it move.

Multiple Choice

Which of the following statements about inertia is correct?

• Inertia is the property of matter that resists changes in motion.

• Inertia is the force that moves objects.

• Inertia only applies to objects in motion.

• Inertia is caused by friction.

Multiple Select

Select all statements that are true based on the images:

• A heavier box requires more force to move than a lighter box.

• Objects with less mass have more inertia.

• A lighter box is easier to move than a heavier box.

• Objects with more mass have more inertia.

Open Ended

Why does the crash-test dummy continue to move forward when the bicycle crashes into a wall?

Multiple Choice

What is inertia and how does it relate to the motion of an object, as shown in the image of the person riding a bicycle?

• Inertia is the force that starts motion; it causes objects to move faster.

• Inertia is the tendency of an object to resist a change in motion; it keeps objects moving unless acted on by an unbalanced force.

• Inertia is the energy stored in moving objects; it increases with speed.

• Inertia is the friction that stops objects from moving; it slows objects down.

Open Ended

Explain Newton's First Law of Motion in your own words and describe its historical significance.

Multiple Choice

According to Newton's First Law, what will happen to an object at rest and an object in motion if no unbalanced force acts on them?

• The object at rest will start moving, and the object in motion will stop.

• Both objects will change direction.

• The object at rest will stay at rest, and the object in motion will stay in motion.

• Both objects will speed up.

Open Ended

Which one best illustrates a balanced force? An unbalanced force? Why?

Fill in the Blanks

Multiple Choice

Which of the following scenarios best illustrates a balanced force?

• A tug-of-war where both teams pull equally and the rope does not move.

• A car accelerating down a hill.

• A person jumping off a diving board.

• A ball rolling to a stop due to friction.

Multiple Select

Select all situations that represent unbalanced forces.

• A tug-of-war where the rope stays in the center.

• A book resting on a table.

• A car speeding up when the light turns green.

• An apple falling from a tree.

Multiple Choice

What is the result of unbalanced forces acting on an object?

• The object accelerates.

• The object remains at rest.

• The object moves at a constant speed.

• The object disappears.

Multiple Select

Which of the following are effects of unbalanced forces as shown in the examples?

• Speeding up an apple due to gravity.

• Slowing down a skater due to friction.

• Changing the direction of a truck.

• Keeping an object at rest.

Multiple Select

If two forces acting on an object are balanced, which statements could be true?

• A moving object will stop.

• A moving object will continue moving at a constant speed.

• A motionless object will start to move.

• A motionless object will remain still and stable.

Multiple Select

If two forces acting on an object are unbalanced, which statements could be true?

• A moving object will stop.

• A moving object will continue moving at a constant speed.

• A motionless object will start to move.

• A motionless object will remain still and stable.

Multiple Choice

What does it mean when a force opposes the motion of an object?

• It helps the object move faster

• It resists the motion, causing the object to slow down or stop

• It changes the direction of the object

• It increases the object's speed

Multiple Select

Which of the following statements about friction are correct (Pick 2)?

• Friction is a force that acts between two surfaces when they push or rub together

• Friction always helps objects move faster

• Friction can cause objects to slow down or stop

• Friction only occurs in liquids

Open Ended

As the ball rolls forward, what role does friction play in its motion?

Open Ended

Another form of friction is ___.

Multiple Choice

How does air resistance affect an object moving through the air?

• It speeds up the object

• It pushes back on the object, slowing it down

• It has no effect on the object

• It makes the object heavier

Open Ended

What does Newton’s 1st law say about an object in motion?

Open Ended

What does Newton’s 1st law say about an object in motion?

Open Ended

If an object in motion stays in motion, why does a rolling ball eventually come to a stop?

Open Ended

How can you apply what you learned about balanced and unbalanced forces to real-life situations?

Open Ended

Choose two examples from the images above that best demonstrate Newton's First Law of Motion. Explain your choices.