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Card Generator 2047 > Science Force > Flashcards

Science Force Flashcards

1
Q

What is the definition of a force?

A

A force is a push or a pull on an object.

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2
Q

What can a force do to an object’s motion?

A

A force can change the speed, direction, or shape of an object.

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3
Q

Fill in the blank: To move an object, it has to be ______ or ______.

A

pushed; pulled

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4
Q

What must happen for a force to come into play?

A

At least two objects must interact.

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5
Q

True or False: A stationary object can move without the application of a force.

A

False.

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6
Q

What happens when two forces act in the same direction?

A

The forces add to one another.

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7
Q

What happens when two forces act in opposite directions?

A

The net force is the difference between the two forces.

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8
Q

What is the term used to describe the strength of a force?

A

Magnitude.

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9
Q

What happens to the speed of an object if a force is applied in the direction of its motion?

A

The speed of the object increases.

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10
Q

What happens to the speed of an object if a force is applied opposite to its motion?

A

The speed of the object decreases.

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11
Q

List the effects a force can have on an object.

A
  • Makes an object move from rest
  • Changes the speed of a moving object
  • Changes the direction of motion
  • Changes the shape of an object
  • Causes some or all of these effects
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12
Q

What is muscular force?

A

The force resulting from the action of muscles in the body.

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13
Q

What is the force of friction?

A

The force that opposes the motion of an object.

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14
Q

What is a non-contact force?

A

A force that acts on an object without physical contact.

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15
Q

Give an example of a non-contact force.

A
  • Magnetic force
  • Electrostatic force
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16
Q

Fill in the blank: A force may cause an object to ______.

A

change its state of motion

17
Q

What is the net force on an object if two equal forces act in opposite directions?

A

The net force is zero.

18
Q

What happens to a ball’s motion when it strikes a ruler placed in its path?

A

The direction of motion of the ball changes.

19
Q

What is required for an object to change shape when a force is applied?

A

The object must be in contact with the force.

20
Q

True or False: An object can change its speed, direction, or shape by itself.

A

False.

21
Q

What is the definition of a non-contact force?

A

A force that can be exerted by an object without direct physical contact with another object.

22
Q

What phenomenon demonstrates that a magnet can exert force without contact?

A

A magnet can exert a force on another magnet without being in contact with it.

23
Q

What is the electrostatic force?

A

The force exerted by a charged body.

24
Q

What happens when a straw is rubbed with a sheet of paper?

A

The straw acquires an electrostatic charge.

25
Q

What is gravity?

A

An attractive force that pulls objects towards the Earth.

26
Q

What causes a coin to fall when released from a hand?

A

The force of gravity acting on the coin.

27
Q

True or False: Gravity is a property exclusive to Earth.

A

False.

28
Q

What is pressure?

A

The force acting on a unit area of a surface.

29
Q

Fill in the blank: Pressure = ______.

A

Force/Area.

30
Q

How does increasing the area of contact affect pressure when carrying heavy loads?

A

It reduces the pressure on the surface.

31
Q

What is the relationship between area and pressure?

A

Smaller area results in larger pressure for the same force.

32
Q

Do liquids exert pressure on the walls of their containers?

A

Yes.

33
Q

What is atmospheric pressure?

A

The pressure exerted by the weight of air in the atmosphere.

34
Q

What did Otto von Guericke demonstrate with his air pump?

A

The force of air pressure by using two hollow metallic hemispheres.

35
Q

How does air pressure affect an inflated balloon?

A

Air inside the balloon exerts pressure in all directions.

36
Q

What happens when you press a sucker against a surface?

A

Most air escapes, allowing atmospheric pressure to hold it in place.

37
Q

What are two types of forces discussed in the text?

A
  • Non-contact forces * Contact forces.
38
Q

What is the effect of force on the state of motion of an object?

A

It can cause a change in speed or direction.

39
Q

What does the pressure exerted by air around us indicate?

A

It is known as atmospheric pressure.

Card Generator 2047 (2 decks)

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