Unit 4 Force Review

If there are two forces going in the same direction how would you find the net force?

• add

• subtract

• multiply

• divide

Tags

NGSS.MS-PS2-2

What is the net force?

• 400N

• 200N

• 0N

• 10N

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

The diagram below shows a stationary cart on a frictionless surface. Two unequal opposing forces are about to be applied to the cart. If the unequal opposing forces are applied to the cart at the same time, what will occur?

• The cart will move to the left.

• The cart will move to the right.

• The cart will move up.

• The cart will remain stationary.

Tags

NGSS.MS-PS2-2

The force of gravity pulling down on the barbell is 756 newtons (N). How many newtons of force are exerted by the weightlifter to hold the barbell up?

• 0N

• 756N

• 321N

• 567N

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A student pushes against a tree with a force of 10 newtons(N). The tree does not move. What is the amount of force exerted by the tree on the student?

• 0N

• 5N

• 10N

• 20N

When a car suddenly stops, the objects in the back seat are thrown forward. This is explained by-

• Newton's 1st law of motion

• Newton's 2nd law of motion

• Newton's 3rd law of motion

• the Universal Law of Gravitation

A sheet of notebook paper lying motionless on a table and not touched by an outside force will MOST likely remain motionless because —

• balanced forces exerted by gravity and the table keep the paper motionless

• an unbalanced force is exerted by the table to keep the paper motionless

• balanced forces exerted by gravity and the air keep the paper motionless

• an unbalanced force is exerted by the air to keep the paper motionless

Tags

NGSS.MS-PS2-4

A soccer ball that is kicked will stay in motion until an equal force is exerted on the ball and it stops rolling. Which of these forces, when exerted on the ball, could stop the ball from rolling?

• gravity and friction

• friction and inertia

• inertia and gravity

• magnetism and friction

Tags

NGSS.MS-PS2-2

Considering Newton's 1st Law, what force is responsible for a golf ball's trajectory?

• force

• gravity

• velocity

• dimples

A volcanic eruption launches thousands of rocks into the air. The rocks will travel different distances due to their different masses, but ultimately all of the rocks will return to the ground. Which of the following explains why that is?

• The rocks do not have any forces acting on them except for the explosive force of the volcano. As a result, the rock's own inertia causes them to return to the ground.

• The moment the rocks are launched into the air there is an unbalanced force of gravity acting on them. That force continually acts on the rocks until they stop moving when they hit ground and the forces are balanced again.

• The moment the rocks are launched they hit other rocks. Those other rocks introduce unbalanced forces that ultimately cause the rocks to fall back to the ground.

• The only rocks that hit the Earth are the ones that have a downward force applied to them by the explosion. Any rocks that have an upward force applied to them continue in that direction and end up in the Earth's atmosphere.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4