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mechanical princpale

Total questions: 62

Worksheet time: 1hrs 2mins

Name
Class
Date
1.
Select the correct units for Strain 
a)
mm2
b)
Pascals
c)
No Units
d)
Newtons
2.
In 'SUVAT' equations, what does the letter 'U' denote?
a)
Speed
b)
Displacement
c)
Umbrellas 
d)
Initial Velocity
3.
The law of the Conservation of Energy states...
a)
Energy can neither be created nor destroyed
b)
There is no such thing as energy
c)
We create our own energy
d)
There is only kinetic energy
4.
Choose the correct formula to Calculate Young's Modulus.
a)
s = ut + 1/2 at2
b)
σ = F/A
c)
a2 + b2 = c2
d)
E = stress ÷ strain
5.
If a simply supported beam is in equilibrium, what can we say is true about its moments.
a)
The sum of the moments = 0
b)
Clockwise moments are less than the anti-clockwise moments
c)
Forces are unequal
d)
They are special
6.
What statement defines a Vector quantity?
a)
It has only a given size
b)
It has only a direction
c)
It is the same as a Scalar quantity
d)
It has both magnitude and direction
7.
Frictional resistance is normally considered to be negative.
a)
True
b)
False
8.
Displacement is a vector quantity
a)
True
b)
False
9.
What does UTS stand for?
a)
Ultimate Tensile Strain
b)
Universal Tap Screw
c)
Unilateral Tensile Stress
d)
Ultimate Tensile Stress
10.

What is the formula for kinetic energy?

a)

KE=12mv2KE = \frac{1}{2}mv^2

b)

KE=mvKE = mv

c)

KE=mghKE = mgh

d)

KE=mv22KE = \frac{mv^2}{2}

11.

What is the term for the rate of doing work or the rate of using energy?

a)

Force

b)

Power

c)

Momentum

d)

Velocity

12.

Which of the following is a scalar quantity?

a)

Force

b)

Velocity

c)

Energy

d)

Acceleration

13.

The formula for work is given by which of the following equations?

a)

Work = Force ×\times Distance

b)

Work = Force / Distance

c)

Work = Distance / Force

d)

Work = Force + Distance

14.

What is the unit of energy in the International System of Units (SI)?

a)

Newton

b)

Joule

c)

Watt

d)

Pascal

15.

Which of the following best describes the relationship between force and work?

a)

Work is done when a force moves an object over a distance.

b)

Work is independent of the force applied.

c)

Force is needed to decrease the amount of work done.

d)

Force and work are unrelated.

16.

ME = ?

(p. 170)

a)

KE + PE

b)

KE - PE

c)

KE2

d)

PE/2

17.

(p.171) In the absence of friction, total mechanical energy:

a)

remains the same

b)

increases exponentially

c)

is lost as heat

d)

cannot be easily used

18.

(p.171) Mechanical energy cannot change form.

a)

True

b)

False

19.

As an egg falls to the ground, its potential energy is continuously converted into (a)   energy. (p.171)

20.

If an egg is thrown up in the air, its kinetic energy would be converted into gravitational (a)   energy. (p.171)

21.

In the absence of friction, initial mechanical energy equals (a)   mechanical energy. (p.171)

22.

If a system is in static equilibrium, it must have the following 2 conditions:

a)

∑τ=0

b)

Constant acceleration

c)

∑F=0

d)

Positive forces only

23.

All the forces rotating counterclockwise will have a _______ torque

a)

positive

b)

negative

24.

The formula used to find a torque is...

a)

(m)(g)

b)

(F) cos(Ɵ)

c)

(F)(r)

d)

(m)(a)

25.

Giving the following image, there are _____ forces acting on the sytem.

a)

3 forces (weight 1, weight 2, and distance 2)

b)

2 forces(weight 1 and weight 2)

c)

1 force (weight 1)

d)

1 force ( weight 2)

26.

If the x component and y component of a vector are 34 N and 20 N respectively, the magnitude of the vector will be...

a)

54N

b)

1000 N

c)

39.44 N

d)

1556 N

27.

The torque of a 50 N force 20 cm away from the pivont point will be...

a)

500 N

b)

20 Nm

c)

10 Nm

d)

15 Nm

28.

If the kid on the left weights 490 N, 0.5m away from the pivont point, then the second kid must have____________ in order to keep it in static equilibrium

a)

340 N, 0.1 m away from the pivont point to the right

b)

220 N, 0.2 m away from the pivont point to the left

c)

490 N, 0.5m away from the pivont point to the right

29.

A state of equilibrium is also seen below. Each of the cars weighs the same 9800 N. Despite the fact that there is only one car on the left-hand side that is 9 m from the fulcrum, the torques balance because, the cars on the right-hand side are ____meters from the fulcrum, compared to the car on the left-hand side.

a)

4.5 m

b)

3 m

c)

1 m

d)

2 m

30.
If the torque required to loosen a nut on the wheel of a car has a magnitude of 60.0 N• m, what minimum perpendicular force must be exerted by a mechanic at the end of a 45.0 cm wrench to loosen the nut?
a)
0.666 Nm
b)
 133.3 N
c)
66.7 N
d)
13.3 Nm
31.
In the diagram above, two masses, one with mass m, the other with mass M = 2m are resting on a uniform plank of length L that pivots at its midpoint. If the mass m is at the far end of the plank, how far away from the pivot should the mass M be to balance the plank in a horizontal position shown?
a)
L/2
b)
L/3
c)
L/4
d)
L/6
32.

Find the magnitude of the torque produced by a 22.0 N force applied to a door at a 30 degree from the perpendicular distance of .005 km from the hinge.

a)

55 Nm

b)

.015 Nm

c)

6.3 Nm

d)

8.75 Nm

33.

According to Newton's first law of motion, an object at rest will remain at rest unless acted upon by what?

a)

gravity

b)

friction

c)

external force

d)

internal force

34.

What is the SI unit of force?

a)

meter (m)

b)

newton (N)

c)

kilogram (kg)

d)

joule (J)

35.

What is the formula to calculate torque?

a)

torque = mass x acceleration

b)

torque = force x distance

c)

torque = speed x distance

d)

torque = work / time

36.

According to Newton's second law of motion, what is the relationship between force, mass, and acceleration?

a)

Force is directly proportional to mass and acceleration

b)

Force is directly proportional to mass but inversely proportional to acceleration

c)

Force is directly proportional to acceleration but inversely proportional to mass

d)

Force is inversely proportional to mass and acceleration

37.

What is the difference between static friction and kinetic friction?

a)

Static friction occurs when an object is at rest, while kinetic friction occurs when the object is in motion.

b)

Static friction occurs when an object is in motion, while kinetic friction occurs when the object is at rest.

c)

Static friction and kinetic friction are the same thing.

d)

Static friction only occurs on rough surfaces, while kinetic friction occurs on smooth surfaces.

38.

What is the net force acting on an object in equilibrium?

a)

Negative

b)

10

c)

Zero

d)

Undefined

39.

What is the principle of moments?

a)

Sum of the clockwise moments is greater than sum of the anticlockwise moments

b)

Sum of the clockwise moments equals zero

c)

Sum of the clockwise moments equals sum of the anticlockwise moments

d)

Sum of the anticlockwise moments equals zero

40.

According to Newton's third law of motion, for every action, there is an equal and opposite what?

a)

acceleration

b)

force

c)

reaction

d)

velocity

41.

What is the difference between statics and dynamics?

a)

The difference is that statics deals with sound, while dynamics deals with light.

b)

Statics deals with living organisms, while dynamics deals with non-living objects.

c)

The difference is that statics deals with objects at rest, while dynamics deals with objects in motion.

d)

Statics is related to computer programming, while dynamics is related to mechanical engineering.

42.
objects in relation to the physical factors that affect them.
a)
Dynamics
b)
Statics
c)
Vector
d)
Scalar
43.
Physical quantity that is completely described by its magnitude.
a)
Scalar
b)
Statics
c)
Dynamics
d)
Vector
44.
A quantity that has both magnitude and direction.
a)
Vector
b)
Statics
c)
Dynamics
d)
Scalar
45.
Load that is applied at a specific, concentrated point
a)
Point Load
b)
Collinear forces 
c)
Uniform Distributed Load
d)
Varying Load
e)
Parallel Forces
46.
A force that is applied evenly over the distance of a support.
a)
Uniform Distributed Load
b)
Point Load
c)
Collinear forces 
d)
Varying Load
e)
Parallel Forces
47.
Forces that act in the same or opposite directions at different points on an object.
a)
Parallel Forces
b)
Point Load
c)
Uniform Distributed Load
d)
Varying Load
e)
Collinear forces 
48.
Refers to the number of forces which stay in a similar plane.
a)
Coplanar Force
b)
Concurrent Forces
c)
Uniform Distributed Load
d)
Varying Load
e)
Parallel Forces
49.
Forces applied to a body on such that their lines of action meet at a single point.
a)
Concurrent Forces
b)
Coplanar Force
c)
Uniform Distributed Load
d)
Varying Load
e)
Parallel Forces
50.
Defined as the force acting on a body in its axial direction.
a)
Axial Tension
b)
Shearing Stress
c)
Axial Stress
d)
Shearing Force 
51.
Describes the amount of force per unit of cross-sectional area that acts in the lengthwise direction of a beam or axle.
a)
Axial Stress
b)
Axial Tension
c)
Shearing Stress
d)
Shearing Force 
52.

What is speed?

a)

The time taken to travel a certain distance.

b)

The distance travelled in one second.

c)

Your acceleration.

d)

How long a journey takes.

53.

A runner travels 40 metres in 2 seconds. What is their speed?

a)

20 m/s

b)

80 m/s

c)

42 m/s

d)

0.05 m/s

54.

Which of the following is not a unit of speed?

a)

mps

b)

mph

c)

m/s

d)

km/h

55.

Which of the following is the relationship for the distance travelled?

a)

d = v + t

b)

d = t / v

c)

d = v / t

d)

d = v x t

56.

Which of these cars has the biggest acceleration?

a)

0 - 60 mph in 6 seconds

b)

0 - 30 mph in 6 seconds

c)

0 - 60 mph in 3 seconds

d)

0 - 30 mph in 9 seconds.

57.

Which of the following best describes this journey?

a)

Acceleration; deceleration; constant speed.

b)

Constant speed; acceleration; deceleration.

c)

Deceleration; acceleration; constant speed.

d)

Acceleration; constant speed; deceleration.

58.

Which of these is the correct definition for acceleration?

a)

Increase in speed.

b)

Increase in speed in one second.

c)

Distance travelled in one second.

d)

Decrease in speed.

59.

Calculate the acceleration of a car if it speeds up from 0 to 45 m/s in 5 seconds.

a)

9 m/s2

b)

40 m/s2

c)

45 m/s2

d)

225 m/s2

60.

Calculate the acceleration of a bike that speeds up from 15 m/s to 35 m/s in 4 seconds.

a)

4 m/s2

b)

5 m/s2

c)

12.5 m/s2

d)

20 m/s2

61.

A car is travelling a journey of 120 miles in a time of 3 hours. A police speed trap detects the car travelling at 75 mph. Which of the following statements is TRUE?

a)

Average speed = 360 mph; Instantaneous speed = 75 mph

b)

Instantaneous speed = 40 mph; Average speed = 75 mph

c)

Average speed = 40 mph; Instantaneous speed = 75 mph

d)

Average speed = 75 mph; Instantaneous speed = 360 mph

62.

What is the acceleration during the first 5 seconds?

a)

2 m/s2

b)

4 m/s2

c)

5 m/s2

d)

10 m/s2

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