1) Where is the gravitational force directed as you stand on the floor?

1 punto

A. upward

B. forward

C. backward

D. downward

2) Which of the following equals the force exerted by the earth on you?

1 punto

A. your mass

B. your weight

C. half your mass

D. half your weight

3) Which of the following shows the presence of friction?

1 punto

A. cars continuously roll down hills

B. things fall off on smooth surfaces

C. people stay in place as they move

D. cars stop when the driver steps on the brakers

4) How distance between two objects affects the pull of gravity?

1 punto

A. the lesser the distance, the lesser the gravitational pull between them

B. the greater the distance, the lesser the gravitational pull between them

C. the greater the distance, the greater the gravitational pull between them

D. none of these, gravitational pull between them depends on their weights

5) Which is true about mass and gravity?

1 punto

A. the lesser the mass of the object, the greater the pull of gravity

B. the greater the mass of the object, the lesser the pull of the gravity

C. the grater the mass of the object, the greater the pull of gravity

D. none of these, gravity and mass are not related

6) What is direction of the frictional force that acts on an object moving to the left?

1 punto

A. upward

B. downward

C. to the right

D. to the left also

7) Which of the following statements is not true about friction?

1 punto

A. it acts upward opposing the pull of gravity

B. it prevents things from sliding of surfaces

C. it keeps things that are in contact with each other

D. it holds objects that are separated by great distance

8) Where is the gravitational force directed when you are holding a glass?

1 punto

A. upward

B. downward

C. into the glass

D. away from the glass

9) If the mass of the Earth is doubled, how much increase would the weight of the objects on Earth be?

1 punto

A. halved

B. doubled

C. thrice

D. remains the same

10) A deliveryman uses a wooden ramp when he delivers thus, packages do not slide off easily making his work take longer. What would be the best way to make the packages slide easily?

1 punto

A. make his wooden ramp wider

B. use water on his wooden ramp

C. use a sandpaper to polish and smoothen his ramp

D. make his wooden ramp narrower

11) Gravity is a contact force that acts between two separate objects.

1 punto

True

False

12) Gravity is the force exerted by the Earth which is equivalent to the mass of an object.

1 punto

True

False

13) Gravity on the Moon is less than the gravity on Earth.

1 punto

True

False

14) Friction, unlike gravity, is a noncontact force.

1 punto

True

False

15) Friction keeps objects from sliding off surfaces.

1 punto

True

False

16) The principle of gravity was discovered by Sir Isaac Newton

1 punto

True

False

17) Friction is the fore that opposes the push of the gravity on objects.

1 punto

True

False

18) The lesser the mass of an object, the greater the pull of gravity on it.

1 punto

True

False

19) Gravity keeps anything from going up

1 punto

True

False

20) Gravitational pull between objects increases as the distance between them decreases.

1 punto

True

False

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