Force & Motion

Newton's first law of motion is also called the law of acceleration.

• True

• False

If an object is at rest, inertia will keep it at rest.

• True

• False

When you are moving at a high rate of speed, having a larger mass makes it harder to stop.

• True

• False

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Gravity is a _____________________.

• velocity

• speed

• force

• weight

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If an equal force acts on each of the following objects, which will have the greatest acceleration?

• a golf ball

• a soccer ball

• a football

• a baseball

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Inertia explains why ______________________ .

• friction can be overcome for all objects

• people in a car move forward in their seats when the car stops quickly

• gravitational forces are stronger on Earth than on the Moon

• the ground pushes against your feet when you run

An object is accelerated when it is acted on by _________ .

• inertia

• a balanced force

• velocity

• an unbalanced force

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In which situation are the forces operating on an object unbalanced?

• A stack of books rests on a table.

• A car has a constant motion of 60 miles per hour.

• Two sides of a balance both support 20 kg.

• A baseball falls at a faster and faster speed.

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Newton’s first law of motion states than an object’s motion will not change unless _______ .

• the net force acting on it is greater than zero.

• a force continues to be applied to the object.

• its inertia is stronger than the applied force.

• the object has no inertia.

Overcoming an object’s inertia always requires

a(n) ____________ .

• large mass.

• massive force.

• unbalanced force.

• two of the above.

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