Nces

The illustration shows the relative motion of an airplane wing and the air around it.

What is the BEST explanation for why the wing is curved on top?

• to decrease downward pressure of air above the wing

• to increase downward pressure of air above the wing

• to decrease downward pressure of air below the wing

• to increase downward pressure of air below the wing

A student concludes that no forces are being applied to a laboratory cart that is moving at a constant velocity. Which statement BEST explains why the student’s conclusion is incorrect?

• The cart must be subjected to a net force to continue moving at the same speed.

• The direction of the cart is changed after unbalanced forces are applied

• The cart is subjected to an applied force that cancels the effect of friction.

• The net force on the cart must be in the direction of motion to overcome friction.

A toy car starts at the top of a ramp, rolls down and slows to a stop.

Which acts MOST to bring the car to a stop?

• friction

• magnetism

• wind speed

• electrical force

Tags

NGSS.MS-PS2-2

A 60-kg man and a 25-kg boy, both on roller skates, push off of each other using their hands. Which of these describes the motion of the two people?

• The man moves farther and faster than the boy.

• The boy moves farther and faster than the man.

• The man moves farther but the same speed as the boy.

• The boy moves faster but the same distance as the man.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Two identical sheets of paper are used in an experiment; one is crumpled into a ball and the other is flat. What will MOST likely happen when they are dropped at the same time from the same height?

• flat sheet will fall on its edge

• both will fall at the same rate

• crumpled sheet will fall faster

• crumpled sheet will move horizontally

Tags

NGSS.MS-PS2-2

In a lab investigation, a student notes that two metal blocks have the same mass. Based on this observation, if the two blocks were put on opposite sides of a balance, they would BEST represent

• balanced forces.

• unbalanced forces.

• equal and opposite reactions.

• objects in motion.

A student pushes on an object with a force of 6 newtons and the object does not move. What force does the object exert on the student’s hands?

A0 NB3 NC6 ND12 N

• 0 N

• 3 N

• 6 N

• 12 N

Tags

NGSS.MS-PS2-1

At Time 1, a force of F1 is applied to the left side of a block. The block moves to the right with a constant acceleration. Then at Time 2, a smaller force, F2, is applied to the right side of the block while F1 is still being applied.

What will MOST likely happen to the block at Time 2?

• It will stop completely.

• It will begin to accelerate to the left.

• It will accelerate to the right at a faster rate.

• It will continue to accelerate to the right at a slower rate.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which statement BEST describes the motion of an object that is being subjected to two forces of equal magnitude in opposite directions?

• The object is accelerating in the direction of the motion.

• The object is at rest or moving at a constant velocity.

• The object is accelerating at a rate that depends on the magnitude of the forces.

• The object starts from rest and then begins to move at a constant velocity.

Tags

NGSS.MS-PS2-2

The diagram shows forces acting on a wagon.

A wagon is pulled to the right using a force of 20 N and to the left using a force of 30 N. What is the net force on the wagon?

• 10 newtons to the left

• 50 newtons to the left

• 10 newtons to the right

• 50 newtons to the right

Tags

NGSS.MS-PS2-2