Force Review

James is driving a car and has a mass of 60kg. Vlad is his passenger and has a mass of 90kg. James suddenly brakes to avoid hitting a deer. Who experiences the greatest force due to seatbelt?

• James. He has the least mass.

• Vlad. He has the greatest mass.

• James. He has the greatest speed.

• James. He has the least speed.

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Four blocks of varying mass are kept on the same surface as shown in the image. If the same force is applied to all four, which will gain speed the fastest?

• 2 kg block

• 3 kg block

• 4 kg block

• 6 kg block

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NGSS.MS-PS2-2

A baseball player is able to swing with exactly the same amount of force every time. Which object would leave the bat with the greatest speed when struck by the player?

• a 45 gram golf ball

• a 145 gram baseball

• a 540 gram croquet ball

• an 8200 gram bowling ball

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NGSS.MS-PS3-1

Two separate cannons with the same explosive charge fire different sized cannon balls. One cannon ball weighs 2 kg, and the other weighs 4 kg. The lighter 2-kg balls travels twice as fast from the cannon as the heavier 4-kg ball. Which of Newton's laws explains this behavior?

• Newton's 1st Law

• Newton's 2nd Law

• Newton's 3rd Law

• Newton's 4th Law

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An inflated balloon is released from rest and moves in a horizontal direction with a velocity "v" as shown in the diagram.

• action-reaction

• friction

• gravitational attraction

• inertia

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When a constant unbalanced force acts on an object in the direction of the motion, what initially happens to the objects's speed?

• It decreases.

• It increases.

• It decreases then increases.

• It remains the same.

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Examine the diagram that shows two men pushing a car. How are the forces exerted by the men acting on the car?

• as balanced forces with a net force of 5 N in opposite directions

• as balanced forces with a net force of 105 N in the same direction

• as unbalanced forces with a net force of 5 N in opposite directions

• as unbalanced forces with a net force of 105 N in the same direction

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A skateboard loaded with boxes is on a level surface. Two forces (F1 and F2) are acting on the skateboard as shown in the image. What is the net force acting on the skateboard, and in which will the skateboard move?

• 55 N; in the same direction as force F1

• 55 N; in the same direction as force F2

• 195 N; in the same direction as force F1

• 195 N; in the same direction as force F2

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Marvin and Jordan play tug-of-war with a rope.

If Marvin wins the game, what would likely be the combination of forces applied?

• Both Marvin and Jordan applied a force of 50 N each.

• Both Marvin and Jordan applied a force of 80 N.

• Marvin applied a force of 50 N, and Jordan applied a force of 80 N.

• Jordan applied a force of 100 N, and Marvin applied a force of 40 N.

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What relationship exists between mass and inertia?

• As mass increases, inertia decreases.

• As mass increases, inertia increases.

• Mass cancels the property of inertia.

• Mass stabilizes the property of inertia.