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Physics > Forces > Flashcards

Forces Flashcards

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1
Q

What can a force do

A

Change the state of motion of an object, speed it up, slow it down, stop it from moving, hold it in place, change direction

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2
Q

What does a force involve

A

Physical contact between objects

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3
Q

What are the two main types of forces

A

Contact forces, action at a distance forces

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4
Q

What is a contact force

A

Types of forces in which the two interacting objects are physically contacting eachother

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5
Q

What is action at a distance forces

A

Two interacting objects , not in physical contact with eachother . Able to exert a push or pull, based on physical separation

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6
Q

What is gravity

A

Between any two objects with mass

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7
Q

What is electrostatic

A

Between positive and negative charges

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8
Q

What is magnetic

A

Between magnetic objects

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9
Q

What is an applied force

A

A force which is applied to an object by a person or another object

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10
Q

What is frictional force

A

The force exerted by a surface on an object , as the object moves across it , or makes an effort to move across it

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11
Q

What does friction result from

A

The two surfaces being pressed together closely, causing intermolecular attractive forces between molecules and different surfaces

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12
Q

What is tension

A

The force which is transmitted through a string , rope, or wire, when it is pulled tight by forces acting from each end

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13
Q

What is air friction

A

A pushing force by the air opposing the motion of the object through the air

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14
Q

What is a normal force

A

Support force exerted upon an object which is in contact with another stable object

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15
Q

What is gravitational force

A

Force of attraction between any two objects which have mass

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16
Q

What is the difference between mass and weight

A

Mass is the amount of substance present in kg

Weight is the force of the earth on us (n)

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17
Q

What direction does gravity always go

A

Downwards

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18
Q

How do we calculate gravity force

A

Mass times 9,8

19
Q

What is a force defined as

A

A push or pull

20
Q

What is the net force acting on the body?

A

A net force is the single force which would have the same effect as all of the forces acting together, if it were to replace all the forces acting on the body

21
Q

What does vector addition mean

A

All forward forces positive and backward forces negative , and them add the forces

22
Q

What happens when the net force is zero

A

The objects motion does not change . The forces are balanced and it is in equilibrium

23
Q

If the forces on an object are balanced

A

The object is stationary , it will remain stationary

24
Q

How can forces be balanced with a moving object

A

Carry on moving at the same speed, in the same direction, won’t speed up, slow down, or change direction

25
Q

A force is not required to keep a moving book in motion…

A

In actuality it is a force which brings the book to rest

26
Q

What happens when the net force is not zero

A

The forces are unbalanced and the object accelerates

27
Q

How does an object accelerate

A

It speeds up, slows down, or changes direction

28
Q

What is the equation for finding the relationship between the net force on an object and the acceleration of the object

A

F net = ma

29
Q

What is mass measured in

A

Kg

30
Q

What is f net

A

Force of newtons

31
Q

What is the acceleration measured in

A

M.s -2 and has the same direction as the force

32
Q

What is the definition of work

A

Work is done by a force , if the force moves an object a distance

33
Q

What are the 3 conditions for work to be done on a force

A

The object must move ,
The force must be acting in the same direction as movement
Force must act on object during entire movement

34
Q

What equation is done to find the work done by the force

A

W= f.x

Force x distance

35
Q

What is the definition of power

A

Rate at which work is done

36
Q

What is the calculation of power

A

P = w/t

Power (watts) = work ( joules) divided by time (seconds)

37
Q

What are the differences between weight and mass

A

Mass = kg , weight = N
Mass is amount of substance present, weight is force of the earth on us
Mass has no direction, weight has force so has direction

38
Q

How many weeks in a year

A

52

39
Q

What is the triangle

A

P , t , work at top

40
Q

What is 1 liter

A

1 kg

41
Q

How many kj in a jule

A

1000

42
Q

What does 200 js -1

A

200 watts

43
Q

What’s the difference between weight and mass

A

Weight is the force of the earth on us. Newtons. Vector quanitity
Mass is the amount of substance present. Kg. Scalar quantity

Physics (4 decks)

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