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Physics > P8,P9,P10-Forces > Flashcards

P8,P9,P10-Forces Flashcards

1
Q

What is a vector

A

Physical quantaties with size and direction

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2
Q

What is displacement

A

The distance without a change in direction

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3
Q

What is scalar

A

Physcial quantaties with size but no direction

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4
Q

What is the difference between speed and velocity

A

Speed is how fast a quantity is moving (scalar)
velocity has size and direction and how fast it is going in that direction (vector)

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5
Q

How many mm = to 1N

A

10mm=1N

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6
Q

What is force measured in

A

Newtons

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7
Q

What is newtons third law of motion

A

for every action there is an equal and opposite reaction

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8
Q

What is the formula for speed

A

Speed = distance/time

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9
Q

What is the letter for speed

A

V

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10
Q

How do you calculate acceleration

A

Acceleration=change in velocity/time taken for change

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11
Q

How do you calculate velocity

A

Distance/time

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12
Q

What is thinking time

A

The speed of your mind reacting to the danger ahead

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13
Q

What is a force

A

A push or a pull on an object that is caused by it interacting with something

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14
Q

What is a contact force

A

When two objects need to be touching for a force to act

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15
Q

What is a non-contact force

A

If objects dint need to be touching for a force to act

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16
Q

What is an interaction pair of forces

A

A pair of forces that are equal and opposite and act on two interacting object

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17
Q

What is weight

A

A force acting on an object due to gravity, therefore the same object on earth and mars will have the same mass but different weight

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18
Q

How do you calculate the weight of an object

A

Weight (N) = mass (KG) x gravitational field strength (N/KG)

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19
Q

What is the weight, mass, gravitational field strength triangle

A

————-Weight————-

Mass X Gravitational foeld strength

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20
Q

What is a resultant force

A

The sum of all the forces. For example; <200N 🚗100N> | <200-100> =<100N

21
Q

When is work done on an object

A

When a force moves an object through a distance energy is transferred and work is done on the object

22
Q

What is the equation to find work done

A

Work done (j)=force(N) x distance moved (m)

23
Q

What is an equillibrium

A

All forces acting on an abject to form a resultant force of 0

24
Q

What is electrostatic force

A

The force between two charged object

25
Q

What is thrust

A

The force causing an object to move (like the force from a rocket engine)

26
Q

What is air resistance

A

The friction of the air on a moving object

27
Q

What is upthrust

A

The force of a fluid or gas (e.g water) pushing an object upwards

28
Q

Bhat is reactant force

A

The force due to contact between two objects

29
Q

What is compression

A

Forces that act inward on an object

30
Q

What is friction

A

A force that opposes motion, occurs when objects rub off eachother

31
Q

What is air resistance

A

A type of friction, occurs when an object moves through air

32
Q

What device can weight be measured in

A

Newton-meter

33
Q

Vhat is the centre of mass

A

The point through which the weight of the object reacts

34
Q

What is the work done, force, distance moved formula triangle

A

Work(W)
Force(F)—————–Distance moved (s)

35
Q

What is displacement

A

A distance between two points without change in direction

36
Q

What is a vector?

A

Physical quantities with size and magnitude.

37
Q

What is a scalar?

A

Physical quantities with size but no direction.

38
Q

What are the two types of forces?

A

Contact and non-contact.

39
Q

What is the difference between contact and non-contact forces?

A

Contact: when objects need contact to exert force.
Non contact: when objects dont need contact to contain force

40
Q

What is Newton’s third law of motion?

A

For every force, there is an opposite reaction.

41
Q

What is friction?

A

The force exerted by a surface against an object.

42
Q

What is weight?

A

The force of gravity pulling things downward. It makes things fall and keeps them on the ground

43
Q

What is upthrust?

A

It pushes things upwards when they are in a liquid, like boats.

44
Q

What is thrust?

A

A forward force from an engine, for example.

45
Q

What is reaction?

A

Stops things from going straight through solid objects.

46
Q

What is air resistance?

A

Tries to stop things moving in the air.

47
Q

What is Newton’s first law of motion?

A

If the resultant force acting on an object is equal, all the forces are balanced.

48
Q

What is centre of mass?

A

The point at which its mass can be thought of as being concentrated.

Physics (5 decks)

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