SSA

A skydiver accelerate as she falls to the earth before opening her chute because...

• she loses mass during her travel

• she gets further from the airplane

• the force of the earth pulls on her

• fewer forces are present to slow her down as she drops

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS2-4

What are the two forces acting on a falling leaf?

• Mass and inertia

• Magnetic force and gravity

• Normal force and friction

• Gravity and friction (air resistance)

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

The law of universal gravitation states that:

• objects repeal each other

• objects attract each other

• objects create friction

• forces are always balanced

Tags

NGSS.MS-PS2-4

The mass of the moon is 1/6^th of the mass of the Earth. What happens to the mass and weight of an astronaut on the moon?

• Their mass stays the same but their weight increases

• Their mass stays the same but their weight decreases

• Their weight stays the same but their mass increases

• Their weight stays the same but their mass decreases

Tags

NGSS.MS-PS2-4

Weight is a force that depends on mass and ....

• gravity

• friction

• energy

• density

Tags

NGSS.MS-PS2-4

The farther apart two objects are, the _______ the gravitational force.

• weaker

• stronger

• less stable

• more stable

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

The more mass and object has, the _______ the gravitational force.

• weaker

• stronger

• less stable

• more stable

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

NGSS.MS-PS2-5

A train rolls to a stop along a horizontal track without the conductor applying brakes. Why?

• the train ran out of momentum

• the force of gravity slowed down the train until it stopped

• the force of friction (opposite to motion) stopped the train

• the natural state of the train is not to be in motion

Tags

NGSS.MS-PS2-2

The diagram below shows forces acting on a model airplane. Both its speed and height above the ground are constant.

Which of the following conditions would cause the model airplane to descend toward the ground?

• The lift is less than the weight.

• The thrust is greater than the drag

• The thrust is equal to the weight.

• The lift is equal to the drag.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

What is the net force of an object that is not moving?

• 0N

• 100N

• Upward force

• Downward force

Tags

NGSS.3-PS2-1