BCGBC4010A Apply structural principles to residential low-rise constructions

Structural principles - Forces

Topic activity
Question 1 of 8
Which of the following statements is true for Newton's laws of motion?
A.	A body in motion will eventually stop
B.	A force is caused by articulation
C.	Action and reaction are equal but opposite in direction
D.	All of the above
E.	None of the above
The correct answer is C - Action and reaction are equal but opposite in direction.

Question 2 of 8
What properties does a force have?
A.	Position
B.	Direction
C.	Magnitude
D.	All of the above
E.	None of the above
The correct answer is D - All of the above. Forces can be represented by vectors which have these properties.

Question 3 of 8
A 40 kilogram bag of cement will exert how much force on a pallet upon which it is stacked?
A.	4 N 
B.	40 N
C.	400 N
D.	4 kN
E.	40 kN
The correct answer is C - 400 N. If a 1 kg mass produces a force of 10 N, then a 40 kg mass will produce a force of 40 x 10 = 400 N.

Question 4 of 8
How much mass is required to produce a force of 250 kN?
A.	250,000 kg
B.	25,000 kg
C.	2,500 kg
D.	250 kg
E.	25 kg
The correct answer is B - 25,000 kg. Given that a force of 10 N is produced from a 1 kg mass and 250 kN = 250,000 N, then 250,000 divided by 10 gives the answer of 25,000 kg.

Question 5 of 8
Which of the following statements are true for a structure in equilibrium?
A.	 Fv = 0
B.	 Fh = 0
C.	 M = 0
D.	None of the above
E.	All of the above
The correct answer is E - All of the above. All of these equations are true if the system is to remain in equilibrium.

Question 6 of 8
What is the force due to gravity on a 1 kg object?
A.	9.8 N
B.	9.8 kN
C.	98 N
D.	98 kN
E.	981 N
The correct answer is A - 9.8 N. The force due to gravity is 9.8 N.

Question 7 of 8
What is the most common unit used to measure stress in structural materials?
A.	Pa
B.	kPa
C.	MPa
D.	N
E.	kN
The correct answer is C - MPa. Both Pa and kPa are too small, and newtons (N) are not the units used for measuring stress.

Question 8 of 8
Newton's second law is represented by which equation?
A.	a = f x m
B.	m = f x a
C.	acceleration = force x mass
D.	force = mass ÷ acceleration
E.	f = m x a
The correct answer is E - f = m x a which is Newton’s second law of motion. 
If you would like more information about any of these questions, talk to your trainer.

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