Science Mod K Unit 1 Review

Which example will result in no motion?

• A. [Diagram: 20 N right 20 N left]

• B. [Diagram: 12 N right 5 N right]

• C. [Diagram: 2 N right 19 N right

• D. [Diagram: 4 N left, 14 N left]

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which diagram shows the largest amount of gravitational force between two objects?

• Two objects, each 100 kg, 1,000 m apart

• One object 100,000 kg and one object 100 kg, 1,000 m apart

• Two objects, each 100 kg, 100,000 m apart

• One object 100,000 kg and one object 100 kg, 100,000 m apart

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-5

The diagram shows an inflated balloon attached to a straw that is moving along a string. Some forces that are acting on the straw are shown.

• force from the string

• friction between the string and straw

• force from the escaping air

• weight of the balloon containing air

Tags

NGSS.MS-PS2-2

A boy on a skateboard is rolling along a flat, paved sidewalk. His skateboard hits a patch of sand, and he slows down.

• mass of the sand

• mass of the skateboard

• increased friction from the sand

• increased gravity on the skateboard

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-5

Student A weighs 75 pounds, and Student B weighs 50 pounds. Student A gives Student B a push while standing on a skateboard as shown in the diagram. After the push, Student A moves backward while Student B remains motionless. Which statement is true?

• Neither student exerted a force on the other.

• Student B exerted a larger force compared to Student A.

• Student A exerted a larger force compared to Student B.

• Each student exerted an equal force on the other.

Tags

NGSS.MS-PS2-1

A car is moving in a straight line at a constant velocity. Which statement best predicts the car’s continued motion?

• The car will come to a complete stop when the slowing forces are less than the forces propelling it forward.

• The car will begin to move right or left at a new velocity because there are no new changes in the forces that continue to act on the car.

• The car will begin to speed up when the slowing forces are greater than the forces propelling it forward.

• The car will continue to move in a straight line at the same velocity as long as the same forces continue to act on the car.

Four wooden blocks with masses of 2 kg, 5 kg, 7 kg, and 9 kg are placed on a table. According to Newton’s first law, which block will have the least inertia?

• the block with a mass of 2 kg

• the block with a mass of 5 kg

• the block with a mass of 7 kg

• the block with a mass of 9 kg

Sam exerts a force (F) of 65 N on a lawn mower with a mass (m) of 25 kg. Which formula can be used to calculate the acceleration (a) of the lawn mower?

• a = F × m

• a = F ÷ m

• a = F + m

• a = F – m

Tags

NGSS.MS-PS2-2

Janelle pushes a box filled with books across the floor of her room. She then adds some books to the box and pushes it with the same force across the same floor. How will the motion of the box change?

• It will move slower because as mass increases, the force of friction between the surfaces also increases.

• It will move faster because as mass increases, the force of friction between the surfaces decreases

• It will move with the same speed because the mass of the object does not affect the force of friction between the surfaces

• It will move with the same speed because the same force was applied on the box in both of the cases

Tags

NGSS.MS-PS2-2

Sam places a 5-kg box on the floor and tries to push the box by applying different forces. Which force will make the box move fastest?

• 5 N

• 10 N

• 5 N

• 20 N

Tags

NGSS.MS-PS2-2