Forces Affect the Motion of Objects (G8U1L3)

• What is a force?

• a form of potential energy

• • a push or pull on an object

• • an electrical or magnetic field

• • an object that is moving or changing shape

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NGSS.MS-PS2-1

You are playing tug-o-war with a friend who can exert a maximum of 200 newtons (N) of force on the rope.

How much force do you need to exert in order to win the tug-o-war?

• more than 100 N

• more than 200 N

• more than 500 N

• it depends on your friend's mass

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NGSS.MS-PS2-2

A vase sits motionless on a table. Which statement best describes all the forces acting on the vase?

• There are no forces acting on the vase.

• The unbalanced force of gravity is acting on the vase.

• The force of gravity is balanced by the support force from the table.

• The support force of the table on the vase is slightly greater than the force of gravity on the vase.

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NGSS.MS-PS2-4

Melanie watched the path a baseball followed after a pitcher threw it. She noticed that the ball traveled horizontally away from the pitcher as well as downward toward the ground. What force caused the ball to accelerate downward when it was thrown?

• applied force

• air resistance

• electrical force

• gravitational force

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NGSS.MS-PS2-4

Newton's First Law, the law of inertia, says that:

• an object in motion will stay in motion without any external force.

• an object will remain in motion only if it is pushed continuously.

• an object's motion will slow down if no forces are applied.

• an object will fall to the ground if no forces are applied.

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NGSS.MS-PS2-2

Carts A and B each have the same force applied to them. Cart A has half the mass of Cart B. How does Newton’s Second Law predict the resulting acceleration of each cart?

• Cart A will have the greater acceleration.

• Cart B will have the greater acceleration.

• Carts A and B will have the same acceleration.

• not enough information to answer

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NGSS.MS-PS2-2

Two ice skaters push away from each other. If one skater accelerates more than the other, what does Newton's Second Law say about the mass of each skater?

• The skater that accelerates less has a smaller mass.
• The skater that accelerates more has a smaller mass.
• The skater that accelerates more has a larger mass.

• Both skaters have equal mass regardless of acceleration.

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

Two ice skaters push away from each other. If one skater accelerates more than the other, what does Newton's Third Law say about the forces exerted on each skater?

• The skater who accelerates more felt a stronger push force.

• The skater who accelerates less felt a stronger push force.

• The skater who pushed harder felt a stronger push force.

• Both skaters felt the same amount of force.

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NGSS.MS-PS2-1

A car is driving on a straight road at a constant speed.

Which force diagram correctly shows all the forces acting on the car?

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NGSS.MS-PS2-2

A car is driving on a straight road and speeding up.

Which force diagram correctly shows all the forces acting on the car?

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NGSS.MS-PS2-2