Forces

A person is sitting on a grassy side of a hill. Why are they not sliding?

• normal force

• gravity

• friction

• magnetism

The car traveled fast across the wood, but it slowed to a stop on the carpet. Why did is slow down on the carpet?

• friction increased

• gravity increased

• gravity decreased

• friction decreased

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-5

What describes the effect these forces have on the box?

• The box moves to west.

• The box moves to the north

• The box moves to the south

• The box moves to the east.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

If there was no gravitational force acting on the moon, what would happen?

• The moon would stay stationary.

• The moon would reverse orbit.

• The moon would crash into earth.

• It would continue at a constant speed in a straight line.

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

Two students pull on a rope with 70 N in opposite directions. If the student on the left increased her force to 140 N, the rope would most likely

• go from stationary to the left

• go from stationary to the right

• decrease in acceleration right

• inscrease in acceleration to right

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A student pushes a box to slide it across the floor. Why did the box start moving?

• The applied force is less than the force of friction

• The applied force is greater than the force of friction

• The normal force of the box is less than the force of friction

• The weight of the box is greater than the force of friction

Tags

NGSS.MS-PS2-2

If the box is to remain motionless, how much force must be applied for z?

• 1600N

• 1300N

• 1200N

• 800N

Tags

NGSS.MS-PS2-2

What describes what will happen if the forces are applied at the same time?

• The fridge will have a net force of 0 and will remain motionless.

• The fridge will have a net force of 5N and will move to the left.

• The fridge will move to the right since there is more than one force on the left.

• The fridge will move to the left since the since the two force on the left are greater.

Tags

NGSS.MS-PS2-2

Which are examples of an action-reaction pair of forces? 

Select TWO correct answers.

• a tennis racquet pushing on a ball while the ball pushes back on the tennis racquet

• a diver pushing down on the diving board while the diving board pushes down on the spring

• a boy climbing up a ladder and holding onto the rails while climbing

• a swimmer pushing on the water while the water pushes back on the swimmer

Tags

NGSS.MS-PS2-1

Amber is sitting on a couch. Gravity exerts a downward force on her. Based on Newton's law of action-reaction, the other force acting on Amber is the

• upward force of gravity

• upward force of the couch

• downward force of air pressure

• downward force of the floor

Tags

NGSS.HS-PS2-1