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# Practice Science Questions

## Physics Forces

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1. Q: What is the push or pull on an object that can cause it to accelerate called?

A: mass

B: force

C: density

D: speed

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2. Q: What is the unit of measure for force?

A: Amp

B: Seconds

C: Newton

D: Erg

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3. Q: What is the sum of all forces acting on an object called?

A: gravity

B: reaction force

C: acceleration

D: net force

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4. Q: In a tug of war, when one team is pulling with a force of 100 N and the other 80 N, what is the net force?

A: 20 N

B: 80 N

C: 100 N

D: 180 N

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5. Q: Newton's First Law of Motion is also called:

A: Law of Friction

B: Law of Reaction

C: Law of Action

D: Law of Inertia

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6. Q: Newton's first Law of Motion states that if there is no net force acting on an object it will:

A: remain at rest

B: move with constant velocity

C: have no acceleration

D: all of the above

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7. Q: What does Newton's Second Law of Motion state?

A: a = mF

B: F = m/a

C: F = ma

D: m = Fa

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8. Q: In the equation F = ma, what does m represent?

A: Mass

B: Meters

C: Force

D: Acceleration

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9. Q: How much net force is required to accelerate a 2000 kg car at 3.00 m/s2?

A: 2000 N

B: 4000 N

C: 6000 N

D: 8000 N

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10. Q: If you apply a net force of 3 N on 100 g-box, what is the acceleration of the box?

A: 5 m/s2

B: 10 m/s2

C: 20 m/s2

D: 30 m/s2

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11. Q: Which is true from Newton's Third law of motion?

A: For every action force there is a smaller reaction force in the opposite direction.

B: For every action force there is an equivalent reaction force in the opposite direction.

C: Both 1 and 2

D: None of the above

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12. Q: What is the net force on 200 g ball when it hits a wall with acceleration of 10 m/s2?

A: 1 N

B: 2 N

C: 3 N

D: 4 N

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13. Q: Are mass and weight the same?

A: Yes

B: No

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14. Q: What will be different on the moon than on the earth?

A: mass

B: weight

C: both 1 and 2

D: none of the above

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15. Q: What do you multiply mass by to get the weight?

A: gravity

B: acceleration

C: density

D: energy

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16. Q: If you mass is 40 kg, what is your weight on the Earth?

A: 298

B: 376

C: 392

D: 462

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17. Q: If the gravity of the Moon is 1/6 of g (which is 9.8 m/s2), what is the mass of an object that has a weight of 115 N on the Moon?

A: 30.2

B: 70.4

C: 74.9

D: 89

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18. Q: The normal force acts on any object that:

A: Is in a gravity well

B: Is in a vacuum

C: In in the air

D: Touches a surface

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19. Q: What is the normal force acting on a 50 kg dog?

A: 440 N

B: 490 N

C: 540 N

D: 570 N

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20. Q: What is the force that acts between two object in contact because of action-reaction?

A: Net Force

B: Friction Force

C: Rebound Force

D: Weight Force

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21. Q: In the equation F(f) = uF(n), where F(f) is the Force of Friction and F(n) is the Normal Force

A: coefficient of friction

B: mass

C: weight

D: gravity

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22. Q: If you throw a 150 g book on a floor where u = 0.2, what is the force of friction?

A: .16 N

B: .29 N

C: .36 N

D: .54 N

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23. Q: How big is the net force acting on an object with constant velocity?

A: 0 N

B: 1 N

C: 10 N

D: 100 N

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24. Q: If a net force of 7 N was constantly applied on 400 g object at rest, how long will it take to raise its velocity to 80 m/s?

A: 0 s

B: 2.23 s

C: 3.47 s

D: 4.57 s

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25. Q: If you push with a 5N force on a 1 kg box that is resting on a floor where u = 0.3, will the box move?

A: Yes

B: No

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