Describing Forces

Which of these is an example of noncontact forces?

• A student pulls a desk across the classroom.

• A student completes her assignment by typing her answers in a document.

• The Earth revolving around the sun.

• A soccer player kicks a ball into a net to score a goal in a soccer game.

Tags

NGSS.MS-PS2-5

NGSS.MS-PS2-4

Which of these objects shows unbalanced forces?

• A pencil lying on a desk.

• A poster hanging on the wall.

• A leaf floating to the ground.

• A ball sitting on the floor.

Tags

NGSS.MS-PS2-2

Select all that apply: Balanced forces

• have a net force equal to zero.

• have a net force greater than zero.

• cause a change in motion.

• do not cause a change in motion.

Select all that apply: Unbalanced forces

• have a net force equal to zero.

• have a net force greater than zero.

• cause a change in motion.

• do not cause a change in motion.

Tags

NGSS.MS-PS2-2

A man pushes a box to the left with 20 N of force. The magnitude of the force is

• 20 N to the left

• 20

• 20 n

• 20 N

Tags

NGSS.MS-PS2-2

The SI unit for force is newtons (n).

• True

• False

When the net force acting on an object is zero, the motion of the object will change.

• True

• False

Tags

NGSS.MS-PS2-2

Calculate net force.

• 7 N to the left

• 7 N to the right

• 7 n to the left

• 7 n to the right

Tags

NGSS.HS-PS2-1

Two students are playing tug-of-war. One pulls on the rope to the left with a force of 300 N. The other pulls to the right with a force of 280 N. What is the net force on the rope?

• 580 N to the right

• 580 N to the left

• 20 N to the right

• 20 N to the left

Tags

NGSS.MS-PS2-2

Select all that apply:

A force

• is defined as a push or pull

• is a vector quantity.

• can cause a change in motion.

• can act on objects from a distance.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-5