forces

Question 1

What are Scalar quantities?

Answer 1

scalar quantities have only magnitude (size) only and do not have direction.

Question 2

What are vector quantities?

Answer 2

Vector quantities have magnitude and an associated direction

Question 3

How can vector quantities be represented?

Answer 3

With arrows.

Question 4

What does the length of the arrow represent?

Answer 4

The length of
the arrow represents the magnitude

Question 5

What does the direction of the arrow represent?

Answer 5

The direction of the force

Question 6

contact force…

Answer 6

When the 2 objects are physically touching

Question 7

non-contact force…

Answer 7

when the 2 objects are physically separated

Question 8

What is weight and what is it measure in?

Answer 8

Weight is the force acting on an object due to gravity. Measure in newtons (N)

Question 9

What is the formula for weight?

Answer 9

Weight(N)=Mass(kg)*gravitational field strength(N/Kg)

^   /W\ /-------\   M|G

Question 10

What does the weight of an object depend on?

Answer 10

The weight of an object depends on the gravitational field strength
at the point where the object is.

Question 11

What is “centre of mass” ?

Answer 11

Centre of mass - The weight of an object (the force due to gravity) can be considered to act at a single point

Question 12

∝

Answer 12

directly proportional

Question 13

What is the formula for resultant force?

Answer 13

F resultant =F larger−F smaller
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Question 14

What is “work” ?

Answer 14

Work= When a force is used to move an object, energy is transferred

Question 15

What is the formula for work done?

Answer 15

work done = force × distance
moved along the line of action of the force
W = F s
work done, W, in joules, J
force, F, in newtons, N
distance, s, in metres

Question 16

When a force of 1N moves an object by 1m, then how much work is done?

Answer 16

When a force of 1N moves an object by 1m, then 1J of work id done

Question 17

1 newton-metre of work…

Answer 17

1 newton-metre of work = 1 joule

Question 18

What is the rule for distance for the formula of work done?

Answer 18

Distance must be in the line of action of the force.

Question 19

What are elastic materials?

Answer 19

Elastic materials are object that return to their original length or shape if we take away the forces acting on them.

Question 20

What are inelastic materials?

Answer 20

When we stretch inelastic materials, they do not return to their original length when the forces are removed

Question 21

How do we calculate the force needed to stretch an elastic object?

Answer 21

force = spring constant × extension
F = k e
force, F, in newtons, N
spring constant, k, in newtons per metre, N/m
extension, e, in metres, m

Question 22

What is inelastic deformation?

Answer 22

Once a material has gone past its elastic limit

Question 23

How do we find the find the formula for moment?

Answer 23

Moment (Nm) = Force (N) x Distance(m)