unbalanced and balanced forces

An object that is at rest will begin to move if which of the following is true?

• The surface on which it rests is frictionless

• The mass of the object is sufficient

• Unbalanced forces act on the object

• Gravity on the object can be reduced

Tags

NGSS.MS-PS2-2

Gravity on the object can be reduced

• move to the right at a constant speed.

• accelerate to the right.

• move to the left at a constant speed.

• accelerate to the left.

Tags

NGSS.MS-PS2-2

A student claims that unbalanced forces acting on an object in motion can cause all of the following results: • The object could stop moving • The object could speed up • The object could change directions The best evaluation of this student’s claims is that -

• none of the claims is true.

• one of the claims is true.

• two of the claims are true.

• all of the claims are true.

Tags

NGSS.MS-PS2-2

A game of tug-of-war, in which two teams pull on opposite ends of a rope, is illustrated here. The center of the rope will move when which of the following is true?

• The ground provides no friction for either team

• One team has more people than the other

• The rope has essentially no mass of its own

• One team pulls with more force than the other

Tags

NGSS.MS-PS2-2

Two horses pull in opposite directions, but together move in the direction shown. Which of the following best describes the forces being applied in this situation?

• The forces are balanced, and the net force is zero

• The forces are unbalanced, and the force of Horse 1 is greater

• The forces are unbalanced, and the force of Horse 2 is greater

• The forces are balanced, and the force of Horse 1 is greater

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A box and forces are shown below. A box rests motionless on the ground. One student is pushing the box to the right with a force of 2 Newtons. The other student is pushing to the left with a force of 5 Newtons. In which direction and with what type of speed will the box move?

• It will move left at a constant speed

• It will move left at an increasing speed

• It will move right at a constant speed

• It will move right at an increasing speed

Tags

NGSS.MS-PS2-2

An image of a toy rocket and forces are shown below. Assuming the only two forces on the toy rocket are lift and gravity, which of the following combinations would result in the rocket moving upward?

• Lift= 5 Newtons / Gravity = 5 Newtons

• Lift = 3 Newtons / Gravity = 4 Newtons

• Lift = 5 Newtons / Gravity = 4 Newtons

• Lift = 4 Newtons / Gravity = 4 Newtons

Tags

NGSS.MS-PS2-2

Two students apply force to a box at rest on the floor. What is the total amount of force in Newtons acting on the box and in which direction?

• 10 N Let

• 10 N Right

• 70 N Left

• 70 N Right

Tags

NGSS.MS-PS2-2

The image provided shows two toy cars pushing against each other with a force given in Newtons. Which of the following describes how the two-car system will behave? The two cars will -

• accelerate steadily to the right.

• move at a constant speed to the right.

• accelerate steadily to the left.

• move at a constant speed to the left.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which of the following examples best represents an object with balanced forces acting upon it?

• A boat moving through the water.

• A book sitting on a high shelf.

• A wagon rolling down a steep hill.