Unit 8 Forces Review

What will happen to a soccer ball that is sliding along the field if friction is acting upon it?

• The ball will move at a constant speed

• The ball will slow down until it comes to a stop or contacts another object

• the ball will move at constant speed for a while and then slow down

• the ball will slow down for a while and then move at a slower constant speed

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NGSS.MS-PS2-2

NGSS.MS-PS3-5

A 4 Kg mass object is traveling 6 m/s West and collides with a 14 Kg mass object traveling 3 m/s East. The two objects stick together. What is the direction and the velocity of the two attached objects after the collision?

• 16.5 m/s West

• 9 m/s West

• 4.5 m/s East

• 0.5 m/s East

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

A dog runs down the street then suddenly changes direction, which statement is true about the dog?

• A net force acted on the dog

• the dog increased its kinetic energy

• there was no force acting on the dog

• The forces acting on the dog is balanced

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NGSS.MS-PS2-2

Two students are pushing a cart as shown.

The cart will move as if it were acted on by a single force with a magnitude of

• 50 N to the right

• 50 N to the left

• 350 N to the left

• 350 N to the right

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NGSS.MS-PS2-2

What force would be needed to accelerate a 20 Kg ball at a rate of 2 m/s/s?

• 40 N

• 10 N

• 22 N

• 18 N

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NGSS.MS-PS2-2

In the picture, a girl is trying to pull a dog on a leash, but the dog and the girl at moving in the same direction(to the right).

Which of the following best describes the forces in this situation?

• The forces are balanced, and the net force is zero

• The forces are unbalanced, and the boy's force is greater

• The forces are unbalanced and the dog's force is greater

• The forces are balanced, and the dog is stronger than the boy

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NGSS.MS-PS2-2

What will happen to a refrigerator if the force from a person pushing it backwards is greater than the force of another person pushing it forward?

• The refrigerator will move at a constant speed for a while and then slow down and stop

• The refrigerator will slow down for a while and then move at a slower constant speed

• the refrigerator will slow down, stop, and then begin moving faster and faster in the opposite direction

• The refrigerator will slow down, stop, and then begin to move at a constant speed in the opposite direction

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

A 30.0 Kg box is moving across a frictionless horizontal surface by a 15.0 N horizontal force. What is the acceleration of the block?

• 0.5 m/s/s

• 2 m/s/s

• 450 m/s/s

• 45 m/s/s

Tags

NGSS.MS-PS2-2

Which of the following statements is true if the box is slowing down while the man pulls it?

• The forces acting on the box are balanced

• The net force is in the same direction that the box is being pulled

• The force exerted by the rope is larger than the force of friction

• The force of friction on the box is larger than the force of the rope pulling on the box

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NGSS.MS-PS2-2

A 20 N force and a 30 N force are acting from a single point in opposite directions. What additional force must be added to produce a net force of 0 N?

• 10 N acting in the same direction as the 20 N force

• 10 N acting in the same direction as the 30 N force

• 50 N acting in the same direction as the 20 N force

• 50 N acting in the same direction as the 30 N force

Tags

NGSS.MS-PS2-2