The Datafile PD-CD 5/DATAFILE_PDCD5.iso/education/b/mcphysics/!MChoice/Default/Forces

Text File | 1994-08-31 | 4KB | 155 lines

@A 3N weight is hung from a spring, which makes it stretch 10cm. If 6N is hung from the same spring instead of 3N, it will stretch by:
#for1
20cm
5cm
10cm

@A 5 N weight makes a spring stretch by 25cm. To make the spring stretch by just 5cm the weight you would use would be:
#for1
1 Newton
25 Newtons
5 Newtons

@Turning forces depend on:
The force and distance from the pivot
The pull of gravity
The distance from the pivot only

@The centre of mass of a long straight ruler is:
In the middle
At each end
Half way between the middle and one of the ends

@The units of turning forces are:
Nm
m
Pa

@A racing car is stable because:
It has a low centre of gravity
It is very light
It is shaped to go through the air easily

@The turning effect of a force is called:
Moment
Pivot
Equilibrium

@When a mass is suspended from a spring the spring stretches. Where does this stretching force come from?
#for1
Gravity
The object the spring is held up by
The spring

@When forces balance exactly this is called:
Equilibrium
Reaction
Moments

@Which ONE of the following would NOT help to make an object more stable?
Putting extra mass on the top of it
Making the centre of gravity lower
Making the base wider

@For equilibrium to occur in turning forces which one of the following MUST be true?
The clockwise moment must equal the anticlockwise moment
The clockwise moment must be bigger than the anticlockwise moment
The anticlockwise moment must be just grater than the clockwise

@When a mass, suspended from a spring, is not moving it is:
In equilibrium
Not being pulled by gravity
Weightless

@Forces are measured in:
Newtons
Kilograms
Joules

@Which one of the following is correct?
Mass never changes, but weight can vary
Mass and weight never change
Mass changes, but weight always remains the same

@The pull of gravity on a mass is called:
Weight
Acceleration
Inertia

@Mass is measured in:
Kilograms
Newtons
Cubic centimetres

@On the planet Jupiter (much larger then the Earth) your mass would be:
just the same
much more
slightly less

@On Earth the gravitational field strength is 10 N/Kg which means:
Each Kg has a weight of 10 Newtons
One Newtons weighs 10 Kg
One Kg has a mass of 10 Newtons

@When you suspend a mass on a spring it stretches so far and stops. Gravity pulls the mass down. What pulls it up?
Force from the spring
Air resistance
The objects weight

@Which one of these statements is correct?
A force is a vector
Forces are scalars
Forces can be either scalars or vectors

@Two forces are of equal size, but they act in opposite directions. We say the forces are in:
Equilibrium
Action
Motion

@A trolley has two forces acting on it. If f1=12 N and f2=14 N then the trolley:
#for4
Moves to the left with a 2 N force acting on it
Moves to the right with a 26 N force acting on it
Moves to the right with a 2 N force acting on it

@The trolley shown in the diagram is not moving. From this we can say that
#for4
The two forces are exactly the same size
Both forces must be zero
The two forces must be different

@If the weight M=4 N and the weight the forcemeter G is 1 N then the reading on the forcemeter H will be:
#for3
4 N
5 N
3 N

@Up to the elastic limit, putting extra masses on a spring in equal steps causes the spring to stretch by:
equal amounts
amounts that get larger as you approach the limit
gradually decreasing amounts

@Weight is different to mass because:
it changes but mass doesn't
it remains constant no matter where you are
it does not depend on gravity

@A field is a region where:
an object 'feels' a force
forces cancel each other out
an object will not be accelerated

@As you get further away from the Earth, the force of gravity:
gets weaker
remains the same
increases

@Someone inside a spacecraft, orbiting the Earth:
is in constant free fall
is weightless
has no mass

@Mass:
depends on the atoms the object is made from
a force, dependent on gravity
can be measured in Newtons