Newton's Laws

Which of the following best describes how a swimmer moves through the water?

• the swimmer uses friction to push himself through the water.

• Air resistance limits the swimmers speed

• the swimmer pushes off the pool and his inertia keeps him moving

• the swimmer pushes back on the water and the water pushes with equal but opposite force back on him.

Tags

NGSS.MS-PS2-1

The bolt in the diagram (left) has gravity pulling it down and a magnetic force pulling it up. These forces are equal and opposite. According to Newton's third law, what is the force paired with the Earth's gravitational pull on the bolt? Note: Not all forces are shown in the diagram.

• The magnet's magnetic pull on the bolt

• The bolt's magnetic pull on the magnet

• The bolt's gravitational pull on the Earth

• There is no paired force

Tags

NGSS.MS-PS2-1

A small sports car travelling at 60 km/h crashes into a large, stationary truck. Which one of the following statements is true?

• The car applies a force to the truck but there is no force from the truck onto the car

• The force that the car applies to the truck when they collide is present before they make contact

• While the car and truck are in contact, equal and opposite forces act on each of them

• During the collision, the car exerts a force on the truck and the truck exerts a force on the car, but these are not related

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NGSS.MS-PS2-1

What is the net force acting on her?

• 0.04 N

• 25 N

• 52 N

• 100 N

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NGSS.MS-PS2-2

A meteoroid is accelerating toward Mars at 10 m/s/s under a gravitational force of 95 N.

What is its mass?

• 0.105 kg

• 9.5 kg

• 105 kg

• 950 kg

Tags

NGSS.MS-PS2-2

A cannon has ten times the mass of the cannonball it fires. Compared to the cannonball, the cannon will experience:

• the same size force but ten times the acceleration

• the same size force but one tenth of the acceleration

• ten times the force but the same acceleration

• one tenth of the force but the same acceleration

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

If the acceleration is kept constant. The mass of the object is ___________ to the force it exerts.

• Directly proportional

• Inversely proportional

Tags

NGSS.HS-PS2-1

If the mass is kept constant. The acceleration of the object is ___________ to the force it exerts.

• Directly proportional

• Inversely proportional

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

An object is moving in a straight line and slowing down.

Which of the following statements must be true?

• The force of inertia is acting on the object

• A net force is acting on the object, in the direction it is moving

• A net force is acting on the object, in the opposite direction to its motion

• No net force is acting on the object

Tags

NGSS.MS-PS2-2

A book sits on a table, without moving, for two months.

In those two months:

• no forces acted on the book

• only gravity acted on the book

• a net force acted on the book

• no net forces acted on the book

Tags

NGSS.MS-PS2-4