Newton's Laws

A number of 1.0-newton horizontal forces are exerted on a block on a frictionless, horizontal surface. Which top-view diagram shows the forces producing the greatest magnitude of acceleration of the block?

• 
• 
• 
• 

Tags

NGSS.HS-PS2-1

Four forces act concurrently on a block on a horizontal surface as shown in the diagram. As a result of these forces, the block

• moves at constant speed to the right

• accelerates to the right

• accelerates to the left

• moves at constant speed to the left

Tags

NGSS.HS-PS2-1

Which situation represents a person in equilibrium?

• a child gaining speed while sliding down a slide

• a man standing still on a bathroom scale

• a teenager driving around a corner in his car

• a woman accelerating upward in an elevator

A rock is thrown straight up into the air. At the highest point of the rock's path, the magnitude of the net force acting on the rock is

• zero

• greater than the magnitude of the rock's weight

• less than the magnitude of the rock's weight, but greater than zero

• the same as the magnitude of the rock's weight

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

Which situation describes an object that has no unbalanced force acting on it?

• a hockey puck moving at constant velocity across ice

• a laboratory cart moving down a frictionless 30.^o incline

• an apple in free fall

• a satellite orbiting Earth (has centripetal acceleration)

Tags

NGSS.HS-PS2-1

A 4.0-kilogram object is accelerated at 3.0 meters per second² north by an unbalanced force. The same unbalanced force acting on a 2.0-kilogram object will accelerate this object toward the north at

• 12 m/s²

• 1.5 m/s²

• 6.0 m/s²

• 3.0 m/s²

Tags

NGSS.HS-PS2-1

A baseball bat exerts a force of magnitude F on a ball. If the mass of the bat is three times the mass of the ball, what is the magnitude of the force of the ball on the bat?

• 2F

• F/3

• F

• 3f

Tags

NGSS.MS-PS2-1

A 100.0-kilogram boy and a 50.0-kilogram girl, each holding a spring scale, pull against each other as shown in the diagram. The graph shows the relationship between the magnitude of the force that the boy applies on his spring scale and time.

Which graph best represents the relationship between the magnitude of the force that the girl applies on her spring scale and time?

• 
• 
• 
• 

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

The diagram shows a compressed spring between two carts initially at rest on a horizontal, frictionless surface. Cart A has a mass of 2 kilograms and cart B has a mass of 1 kilogram. A string holds the carts together.

The string is cut and the carts move apart. Compared to the magnitude of the force the spring exerts on cart A, the magnitude of the force the spring exerts on cart B is

• four times as great

• twice as great

• the same

• half as great

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

Which object has the greatest inertia?

• a 10.-kg mass traveling at 10. m/s

• a 15-kg mass traveling at 5.0 m/s

• a 5.0-kg mass traveling at 15 m/s

• a 10.-kg mass traveling at 5.0 m/s