Forces Intro

Which statement is true?

• An object at rest will remain at rest unless an unbalanced force acts on it.

• An object in motion always has an unbalanced force acting on it.

• An object in motion cannot be acted on by more than one force.

• The net force on an object in motion cannot be zero.

Why do you notice the pull of Earth’s gravity but not the pull of the Sun’s gravity?

• Gravity only pulls on objects that are touching each other.

• Earth is much massive than the Sun.

• The Sun is very far away.

• The Sun’s gravity only pulls on you during the day.

What changes when unbalanced forces act on an object?

• mass

• motion

• inertia

• weight

What force slows a book sliding on a table?

• reaction force

• inertia

• gravity

• sliding friction

What does the length of a force vector represent?

• the object’s velocity

• the force’s magnitude

• the force’s direction

• the direction of acceleration

What would cause an object to have a smaller acceleration?

• Increase the net force on the object.

• Decrease the mass of the object, keeping the net force constant.

• Increasing the mass of the object, keeping the net force constant.

• Decreasing the mass of the object and increasing the net force on the object.

If a student pushes a book across a table with a force of 6 N and the force of friction is 4 N, what is the net force on the book?

• 0 N

• 2N

• 10 N

• -2 N

What is the net force on the block? (click on the words to view the picture)

• 5 Newtons up
• 5 Newtons down
• 15 Newtons up
• 15 Newtons down

Tags

NGSS.MS-PS2-2

The unit of force is

• m/s
• m/s^2
• newton
• kg

Jupiter has about 317 times more mass than Earth. What can you infer from this fact? 

• That Jupiter’s gravitational force is much weaker than on Earth’s gravitational force.
• That Jupiter’s gravitational force is much stronger than Earth’s gravitational force.
• That Jupiter’s and Earth’s gravitational forces are equal.
• Mass has no effect on the gravitational force between two objects

Tags

NGSS.MS-PS2-4