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Physics > Forces > Flashcards

Forces Flashcards

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1
Q

what is newtons first law

A

a body will remain at rest or continue in a straight line at a constant speed as long as the forces acting on it are balanced

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2
Q

what is the resultant force

A

the overall force acting on an object

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3
Q

what is newtons second law

A

when a resultant force acts on a mass then there will be a change in its velocity

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4
Q

what is the formula for force

A

force = mass * accelaration

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5
Q

what is inertial mass

A

a measure of how difficult it is to change the velocity of a moving object

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6
Q

what is weight

A

the force that a body experiences due to its mass and the size of the gravitational feild

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7
Q

what is mass

A

the amount of matter

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8
Q

what is weight measured in

A

Newtons

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9
Q

what is mass measured in

A

Kg

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10
Q

what is the formula for weight

A

mass * gravity

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11
Q

what 2 factors affect the strength of gravity

A

the mass of the body
the radius of the object

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12
Q

what tool is used to measure weight

A

Newtonmeter

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13
Q

what force causes circular motion to occur

A

centripetal force

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14
Q

what force causes the centripetal force of a car on a turn

A

friction

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15
Q

what is momentum in simple objects

A

the power of a moving object

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16
Q

what is the formula for momentum

A

mass * velocity

17
Q

what is the equation for the force that uses momentum

A

change in momentum/time taken

18
Q

what is newtons third law

A

for every action, there is an equal and opposite reaction

19
Q

give an example of newtons third law (use man and wall) and why it is

A

man pushing on the wall
wall(normal contact) pushing on man

needs to act on 2 different objects

20
Q

momentum is c…

A

conserved

21
Q

what is the average human reaction time

A

0.2

22
Q

what is the definition of human reaction time,

A

the time it takes between a stimulus and a response

23
Q

what 4 factors affect the reaction time of drivers

A

tiredness
alcohol and drugs
distractions
age

24
Q

what is stopping distance

A

the total distance over which a vehicle comes to rest

25
Q

what 2 things make up stopping distances

A

thinking distance
braking distance

26
Q

what is thinking distance

A

the distance the car travels while the driver reacts to the danger

27
Q

what is braking distance

A

the distance the car travels while braking

28
Q

what 3 factors affect the braking distance of a car

A

road condition
weather
condition of breaks and tyres
mass of the car

29
Q

what equation is used in stopping distance

A

F * D = 0.5 * mass * accelaration

Physics (9 decks)

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