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P8 Forces in balance

Total questions: 38

Worksheet time: 51mins

Name
Class
Date
1.

What is the unit for force?

a)

Joules (J)

b)

seconds (s)

c)

Newtons (N)

d)

meters (m)

2.

How will this object move?

a)

The object will move to the left, as the forces are balanced.

b)

The object will move to the right, as the forces are unbalanced.

c)

The object will move to the left, as the forces are unbalanced.

d)

The object will move to the right, as the forces are balanced.

3.

Which of the following is an example of an unbalanced force?

a)
b)
c)
d)
4.

What is the sum of all forces acting on an object?

a)

Resultant Force

b)

Balanced Force

c)

Unbalanced Force

d)

Applied Force

5.
A quantity that has both magnitude and direction is called a scalar quantity.
a)
True
b)
False
6.
Which symbol is used to show vector quantities?
a)
Circle
b)
Line
c)
Arrow
d)
Triangle
7.

which of the following is a vector?

a)

velocity

b)

distance

c)

position

d)

speed

8.
Which of the following quantities are vectors?
a)
speed, velocity, acceleration
b)
velocity, acceleration, force
c)
force, acceleration, mass
d)
length, mass, time
9.
Which of these is not a vector quantity? 
a)
displacement 
b)
time
c)
velocity 
d)
acceleration
10.
Which statement describes a vector?
a)
It has magnitude but no direction
b)
It has direction but no magnitude
c)
It has both direction and magnitude
d)
It has constant magnitude but no
 direction
11.

Select the correct equation to calculate the moment of a force.

a)

Moment = Force / Distance

b)

Moment = Force x Distance

c)

Force = Moment x Distance

d)

Distance = Moment x Force

12.

The unit of moment is...

a)

Newtons (N)

b)

Newtonmetres (Nm)

c)

Ohms (Ω)

d)

seconds (secs)

13.
What is the anticlockwise moment acting on this crane?
a)
80,000Nm
b)
100,000Nm
c)
120,000Nm
d)
140,000Nm
14.
What is the moment acting on the seesaw?
a)
1.6Nm
b)
15Nm
c)
16N
d)
4Nm
15.
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)
16.

Which situation experiences forces in equilibrium?

a)

a car moving down a hill with increasing velocity

b)

an apple falls from a tree

c)

a rocket accelerates upward

d)

a ship floating above the sea surface

17.

Calculate the moment caused by the spanner on the nut.

(a)  

18.

To increase the size of the moment, we can...

a)

increase the size of the force

b)

decrease the size of the force

c)

increase the distance from the pivot

d)

decrease the distance from the pivot

19.

Which gears will turn clockwise if gear A is turned anticlockwise?

a)

B

b)

C

c)

D

d)

E

e)

F

20.

Larger gears produce ______ moments

a)

smaller

b)

larger

c)

no

21.

What is a lever?

a)

Any piece of metal that bends.

b)

Any bar or a rod that's set up to tilt on a fulcrum

c)

Any bar or a rod that's set up to tilt

d)

Any bar that's attached to a pulley

22.

What best describes what a load is?

a)

a type of simple machine

b)

an example of a lever

c)

what you are trying to lift

d)

the effort

23.

When discussing simple machines, what is effort?

a)

a type of simple machine

b)

the force you apply to move an object

c)

what the simple machine is lifting

d)

the point where the lever pivots

24.

What happens if you decrease the distance between the fulcrum and the load?

a)

You can use less force to move the load

b)

You have to decrease the length of the lever

c)

You can use more force to move the load

d)

You have to increase the height of the fulcrum

25.

What is an example of a lever in the real world?

a)

ski slope

b)

wheels on a car

c)

seesaw

d)

kitchen table

26.
What is the centre of mass ?
a)
it is a single point at which the object can balance.
b)
The mass is distributed equally around it.
c)
the centre of gravity of the object
d)
All of the above
27.
where is the centre of mass of this image
a)
at 20 mark
b)
at 42.5 mark
c)
at 50 mark
d)
at 100 mark
28.

The diagram shows a uniform, flat metal sheet hanging freely from a nail at point A. One of the labelled points is at the centre of mass of the metal sheet.

Which point is at the centre of mass?

a)

A

b)

B

c)

C

d)

D

29.

Where will be the centre of mass of a uniform rod lies ?

a)

At its end

b)

At its middle point

c)

At its centre of its cross sectional area

d)

Depends upon its material

30.

Where the center of mass of a circle lies?

a)

At its centre

b)

Anywhere on its radius

c)

Anywhere on its circumference

d)

Anywhere on its diameter

31.

A simple method to find centre of mass of a body uses a ___

a)

stop watch

b)

plumbline

c)

pendulum

d)

gauge

32.

Where do you hang the plumb line when determining the Centre of mass?

a)

It doesn't matter, because it always goes through the CG

b)

Only from the corners

c)

From the point where you are suspending the object

d)

At the right angle

33.

Do all objects have a centre of gravity?

a)

No objects have a centre of gravity

b)

Only some objects have a centre of gravity

c)

Only very heavy objects have a centre of gravity

d)

Yes all objects have a centre of gravity

34.

Diagram shows a stationary trolley (in equilibrium) on an inclined plane.

What can we say about the magnitude of the force, F ?

a)

It is equal to the weight, W

b)

It is greater than the weight, W

c)

It is equal to the component of the weight, W, that is parallel to the slope.

d)

It is equal to the component of the weight, W, that is perpendicular to the slope.

35.

Which method can we use to solve for the resultant force?

a)

Head to Tail method

b)

Tail-to-Tail method

c)

Parallelogram method

d)

Pythagorean method

36.

Two forces F1 and F2 act on an object as in the diagram above.


If F1 and F2 are drawn to scale, the resultant force can be found by measuring the length of the resultant line FR.


Which of the following diagrams shows the correct position of the line FR?

a)
b)
c)
d)
37.

Vector A is directed northward and vector B is directed eastward. Which of the following vector addition diagrams best represent the addition of vectors A and B and the subsequent resultant?

a)

A

b)

B

c)

C

d)

D

e)

E

38.

FINAL QUESTION: TAKE YOUR TIME. REMEMBER A DRAWING WILL HELP!


A Force F is resolved into two components, Fh and Fv at right angles to each other as in the diagram above. Which statement below is NOT true?

a)

Decreasing the angle θ will increase the size of Fh

b)

Increasing the angle θ will increase the size of Fv

c)

Fh and Fv have sizes that when added together give a total equal to the size of F.

d)

Fh and Fv have sizes that when added together give a total greater than the size of F.

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