B

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

The forces acting on a box are illustrated below. The result of these forces will be that the box will-

• 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 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 claim is that-

• none of the claims are true.

• one of this 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-PS2-2

What motion will result from two forces acting on an object: one force of 50 Newtons to the east, the other a force of 30 Newtons to the west? The object will-

• move east at a constant speed.

• accelerate to the east.

• move west at a constant speed.

• accelerate to the west.

Tags

NGSS.MS-PS2-2

A box and forces are shown above. 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 an increasing speed.

• It will move right at a constant speed.

• It will move right at an increasing speed.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

An image of a toy rocket and forces are shown below. Assuming the only 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 = 3 Newtons

• Lift = 4 Newtons Gravity = 4 Newtons

Tags

NGSS.MS-PS2-2

Calculate the net forces. Use an arrow to indicate the direction of the movement.

• 70 N →

• 70 N ←

• 30 N →

• No movement

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Calculate the net forces. Use an arrow to indicate the direction of the movement.

• 60 N →

• 120 N ←

• 30 N →

• No movement

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2