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Turning Effect of Force, Hooke's Law

Total questions: 63

Worksheet time: 2hrs 4mins

Name
Class
Date
1.

What is force in physics?

a)

A power in star wars

b)

A push or pull on an object

c)

A stop on an object

d)

The start of an object

2.

What is the measure of force?

a)

Newtons

b)

Light years

c)

Inches

d)

Gallons

3.

What is the unit for FORCE?

a)

N (Newtons)

b)

lbs (pounds)

c)

g (grams)

d)

m/s (meters per second)

4.

Moment can be calculated using the equation:

a)

M = F × d

b)

M = F / d

c)

M = F2 × d

d)

M = F / d2

5.

The moment of a force causes an object to

a)

move forward.

b)

move backward.

c)

stop moving.

d)

turn about a fixed point

6.

Mr Wang uses a metal rod to raise a large stone, as shown below.


Which force would raise the large stone most easily?

a)

A

b)

B

c)

C

d)

D

7.

Turning effect of force is ________.

a)

torque

b)

moment of force

c)

balancing moment

d)

couple

8.

The SI unit of moment of force is –

a)

m

b)

N

c)

kgf

d)

Nm

9.

Moment can be calculated using the equation:

a)

M = F × d

b)

M = F / d

c)

M = F2 × d

d)

M = F / d2

10.
What is the moment acting on the seesaw?
a)
1.6Nm
b)
15Nm
c)
16N
d)
4Nm
11.

What is the size of the moment shown by the black arrow?

a)

30 Nm

b)

36 Nm

c)

40 Nm

d)

60 Nm

12.

Moment (Nm) =

a)

Force (N) x distance (m)

b)

Angular Force (N°) x distance (m)

c)

Work done (J)

d)

Force (N) x distance (s)

13.
What is the moment produced by the 15 N?
a)
15 Nm (clockwise)
b)
150 Nm (anti - clockwise)
c)
1.5 Nm (anti - clockwise)
d)
0.15 Nm (clockwise)
14.

A see-saw is made by resting a long plank of wood with its centre of gravity on the barrel.


A boy sits on one side of the barrel and a girl sits on the other side so that the see-saw is balanced.


Which of the following statements must be true?

a)

boy’s weight = girl’s weight

b)

distance x = distance y

c)

moments of the girl = moments of the boy

d)

moment of the girl > moment of the boy

15.

A boy of weight 600N sits on the see-saw as shown at a distance of 1.5m from the pivot. What is the force F required at the other end to balance the see-saw?

a)

450 N

b)

350 N

c)

4.5 N

d)

200 N

16.

What is the force F needed to balance the bar shown?

a)

4

b)

6

c)

8

d)

12

17.

Assuming the system is in equilibrium, calculate the missing distance d

a)

3.4 m

b)

2.8 m

c)

4.4 m

d)

1.6 m

18.

A boy of weight 600N sits on the see-saw as shown at a distance of 1.5m from the pivot. What is the force F required at the other end to balance the see-saw?

a)

450 N

b)

350 N

c)

4.5 N

d)

200 N

19.

A moment is...

a)

a force measured in Newtons

b)

a turning force measured in newton metres

c)

a distance measured in metres

d)

a time intervals measured in clicks

20.

Two masses of mass 10.0 and 6.0 kg are hung from massless strings at the end of a light rod. The rod is virtually weightless. A pivot (fulcrum) is placed off center and the system is free to rotate. If the 6.0 kg mass is 4.0 m away from the pivot, how far away is the 10.0 kg mass if the system is not rotating?

a)

0.42 m

b)

2.4 m

c)

4.8 m

d)

4.2 m

21.

What is force in physics?

a)

A power in star wars

b)

A push or pull on an object

c)

A stop on an object

d)

The start of an object

22.

What is the measure of force?

a)

Newtons

b)

Light years

c)

Inches

d)

Gallons

23.

What is the unit for FORCE?

a)

N (Newtons)

b)

lbs (pounds)

c)

g (grams)

d)

m/s (meters per second)

24.

Moment can be calculated using the equation:

a)

M = F × d

b)

M = F / d

c)

M = F2 × d

d)

M = F / d2

25.

The moment of a force causes an object to

a)

move forward.

b)

move backward.

c)

stop moving.

d)

turn about a fixed point

26.

Mr Wang uses a metal rod to raise a large stone, as shown below.


Which force would raise the large stone most easily?

a)

A

b)

B

c)

C

d)

D

27.

Turning effect of force is ________.

a)

torque

b)

moment of force

c)

balancing moment

d)

couple

28.

The SI unit of moment of force is –

a)

m

b)

N

c)

kgf

d)

Nm

29.

Moment can be calculated using the equation:

a)

M = F × d

b)

M = F / d

c)

M = F2 × d

d)

M = F / d2

30.
What is the moment acting on the seesaw?
a)
1.6Nm
b)
15Nm
c)
16N
d)
4Nm
31.

What is the size of the moment shown by the black arrow?

a)

30 Nm

b)

36 Nm

c)

40 Nm

d)

60 Nm

32.

Moment (Nm) =

a)

Force (N) x distance (m)

b)

Angular Force (N°) x distance (m)

c)

Work done (J)

d)

Force (N) x distance (s)

33.
What is the moment produced by the 15 N?
a)
15 Nm (clockwise)
b)
150 Nm (anti - clockwise)
c)
1.5 Nm (anti - clockwise)
d)
0.15 Nm (clockwise)
34.
If F is force, k is spring constant and x is extension, Hooke's Law tells us that:
a)
F=k/x
b)
x=Fk
c)
k=Fx
d)
F=kx
35.
Hooke's Law fails when a material reaches its:
a)
breakdown
b)
elastic limit
c)
end of tether
d)
fracture stress
36.
A graph of extension against force for an elastic material is:
a)
A downward curve
b)
An upward curve
c)
A straight line from any point on the x and y axis
d)
A straight line from the origin
37.
A stiff material has a:
a)
high spring constant
b)
low spring constant
c)
spring constant of any value
d)
spring constant which is difficult to predict
38.
A spring has a spring constant of 5N/cm.  What is its extension when loaded with 15N?
a)
4cm
b)
5cm
c)
3m
d)
3cm
39.
A spring extends 1.5m under load 10N. What is its spring constant?
a)
0.15N/m
b)
10N/m
c)
6.7N/m
d)
15N/m
40.
Which of the following springs is the stiffest?
a)
A spring that requires a froce of 2000 N to compress it by 6.8 m.
b)
A spring that requires a force of 4000 N to stretch it by 9.0 m. 
c)
A spring that requires a force of 8000 N to compress it by 45 m.  
d)
A spring that requires a force of 4800 N to stretch it by 14 m.
41.
What Quantity can you calculate from the graph and give the magnitude of that quantity.  
a)
distance 4.5 m
b)
Force 15 N
c)
spring constant 20 N/m
d)
spring constant 200 N/m
42.

A 25,000 N Car is supported by 4 springs. If each spring is deflected by 0.040 m what is the spring constant? (Think about how much weight each spring holds up!)

a)

160,000 N /m

b)

620,000 N/m

c)

630,000 N/m

d)

120,000 N/m

43.
A net force of 430 N acts to stretch an extension spring.  How far will the spring stretch if its spring constant is 700 N/m?
a)
43.9
b)
0.307 m
c)
1.63 m
d)
0.614 m
44.
A 5-newton force causes a spring to stretch 0.2 meter. What is the potential energy stored in the stretched spring?
a)
1 J
b)
0.5 J
c)
0.2 J
d)
0.1 J
45.
An unstretched spring has a length of 0.10 meters. When the spring is stretched by a force of 16 newtons, its length is increased to 0.18 meters. What is the spring constant of this spring? 
a)
0.89 N/cm 
b)
2.0 N/cm 
c)
1.6 N/cm 
d)
1.8 N/cm
46.
5,000 g = ____________ kg
a)
2
b)
50,000
c)
5
d)
10
47.
A 450 N object has a mass of _____ on earth
a)
4500 kg
b)
45 kg 
c)
4.5 kg 
d)
450 kg
48.

What type of force is shown inside of the picture?

a)

Tension

b)

Friction

c)

Elastic

d)

Gravitational

49.

What happens when the stretching force on an elastic material is released?

a)

The material breaks.

b)

The material remains stretched out.

c)

It does nothing

d)

The material snaps back to its original shape.

50.
Which statement most accurately represents Hooke's Law?
a)
a) Extension of a spring is proportional to the force applied.
b)
b) Extension of a spring is proportional to the number of coils.
c)
c) Extension of a spring is inversely proportional to the force applied.
d)
d) Thickness of a spring wire is proportional to the force applied.
51.
Give the units for a Force?
a)
a) J
b)
b) N
c)
c) Kg
d)
d) m
52.
Which keyword is defined as 'the amount of substance in an object'?
a)
a) Speed
b)
b) Density
c)
c) Mass
d)
d) Weight
53.

Spring constant is measured in

a)

N

b)

N/m

c)

m

54.

The formula to calculate extension is =

a)

Extended length – original length

b)

Original length - extended length

c)

Extended length + original length

d)

None of the above

55.

_________ is the unit of Spring Constant

a)

N

b)

N/m

c)

m

56.

Load is also known as the

a)

Extension (in m)

b)

Extended length (in m)

c)

Force applied (in N)

d)

Spring constant

57.

A force of 400 N is applied to stretch a spring which has a spring constant, k=100 N/m. How much does the spring stretch past its free length?

a)

0.4 m

b)

2.34 m

c)

4 m

d)

5.17 m

58.
Which of the following is a true statement regarding springs?
a)
The higher the value of the spring constant, the stiffer the spring.  
b)
In Hooke's law, the force exerted by the spring acts in the same direction as displacement.  
c)
Springs are designed to provide unpredictable variations in force.  
d)
The force exerted by a spring has a quadratic relationship with the displacement form equilibrium.  
59.

Who discovered Hooke's law?

a)

Robert Hooke

b)

Charlie

c)

Newton

60.

If the original length of a spring is 20m and its extended length is 30m. What is the extension?

a)

20m

b)

12m

c)

75m

d)

45m

e)

10m

61.
Hooke's Law fails when a material reaches its:
a)
breakdown
b)
elastic limit
c)
end of tether
d)
fracture stress
62.
A graph of extension against force for an elastic material is:
a)
A downward curve
b)
An upward curve
c)
A straight line from any point on the x and y axis
d)
A straight line from the origin
63.

The Diagram shows a load-extension graph for a wire. Which point is the limit of proportionality?

a)

A

b)

B

c)

C

d)

D

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