10-23 Newtons First Law of Motion Checkup

An object’s motion can change in which of the following ways?

• By changing its speed

• By changing its direction

• By changing both speed and direction

• By remaining constant

What forces are acting on you right now?

• Gravity

• Friction

• Magnetic force

• All of the above

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What do you think the term “equilibrium” means?

• A state of rest or balance due to the equal action of opposing forces

• A condition where all variables are changing

• A situation where there is constant movement

• A phase where only one force is acting

How do we know the forces are balanced in this example?

• The net force is zero.

• The objects are moving at a constant speed.

• The objects are accelerating.

• The forces are unbalanced.

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Unbalanced forces cause what kinds of changes?

• Change in speed

• Change in direction

• Change in shape

• All of the above

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In your own words, what does “inertia” mean?

• The tendency of an object to resist changes in its state of motion

• The ability of an object to move faster

• The force that causes objects to stop

• The energy required to start an object moving

After a ball is kicked and put into motion, what will happen to the ball?

• It will come to a stop immediately.

• It will continue to move until acted upon by another force.

• It will change direction on its own.

• It will move faster and faster indefinitely.

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How can forces be balanced even though the motion is occurring?

• Forces are balanced when the net force is zero.

• Forces are balanced when the object is at rest.

• Forces are balanced when the object is moving at a constant speed.

• Forces are balanced when the object is accelerating.

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Why will an object on top of a car keep moving when the car stops?

• Due to inertia

• Because of friction

• Because of gravity

• Due to air resistance

What would happen if there were no unbalanced forces to act on a skier at the top of the mountain?

• The skier would remain stationary.

• The skier would start moving downhill.

• The skier would move uphill.

• The skier would float in the air.

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