Newton's law

A block of cheese B hangs from the ceiling by rope 1. A wheel of cheese W hangs from the block of cheese by rope 2.

What is the correct free body diagram for the wheel of cheese W?

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Answer explanation

There are two contact forces where ropes 1 and 2 touch the cheese rope 1 and 2 pulls up .

The cheese wheel W experiences gravity only pulling on its mass.

Tags

NGSS.HS-PS2-1

A car slows down.

Which claim about the forces acting on the car must be true?

• There is not enough information.

• There is net force on the car.

• There is no net force on the car.

• There are no forces on the car.

Tags

NGSS.MS-PS2-2

An airplane of mass 4,500 kg is taking off, flying through the air accelerating forward and upward.

.

What is the force of gravity on the airplane during takeoff? (use 9.8 m/s/s as gravitational constant)

answer choices

• 44 145 N

• 44 100 N

• 459.18 N

• 458.71 N

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

A hippopotamus weighs 25 000 N. What is the mass of the hippopotamus? (Use 9.8 m/s/s as gravitational force)

• 245 000 kg

• 245 250 kg

• 2 551 kg

• 2 548 kg

Tags

NGSS.MS-PS2-4

A basketball is resting on the ground.

Which claim about the forces acting on the basketball must be true?

• There are no forces acting on the basketball.

• There is not enough information.

• There is no net force acting on the basketball.

• There is no net force acting on the basketball.

A wall painter of mass m accidentally slips and falls into a net. He experiences a normal force magnitude Fn while touching the net.

Which of the following statements is correct for the acceleration magnitude a of the painter?

• a= -g

• a = Fn - mg

• a = Fn- mg/ m

• a = Fn/ mg

Tags

NGSS.MS-PS2-2

You and a friend are pulling on a rope in opposite directions as hard as you can.

What is the equal and opposite force for the force of your hand pulling on the rope as described by Newton's third law?

answer choices

• Friction of the ground on your shoes in the same direction

• Rope pulling on your hand in the opposite direction

• Friend pulling on the rope in the opposite direction

• Rope pulling your friend's hand in the same direction

Tags

NGSS.MS-PS2-1

A spiderman climbs a rope, pulling down on it to hoist himself up.

What is the equal and opposite force for the force of spiderman pulling on the rope as described by Newton's third law?

• Force of the rope pushing back on spiderman

• Force of gravity from Earth pulling down on spiderman

• Force of gravity of spiderman pulling up on the Earth

• Rope pulling back on spiderman in the opposite direction.

Which of the following situation does NOT shows Newton's 2nd law?

• Pushing an empty cart

• Hitting a tennis ball with a bat

• Ball rolling on the ground.

• 5 people lifting a wardrobe

Tags

NGSS.MS-PS2-2

What property does an object's mass represent?