Forces Flashcards

(29 cards)

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…

21
Q

what is the average human reaction time

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
what 2 things make up stopping distances
thinking distance braking distance
26
what is thinking distance
the distance the car travels while the driver reacts to the danger
27
what is braking distance
the distance the car travels while braking
28
what 3 factors affect the braking distance of a car
road condition weather condition of breaks and tyres mass of the car
29
what equation is used in stopping distance
F * D = 0.5 * mass * accelaration