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Year 8 - Forces

Total questions: 28

Worksheet time: 27mins

Name
Class
Date
1.
Friction is a force that acts in an ___________ direction of movement.
a)
similar
b)
opposite
c)
parallel
d)
west
2.
Which of the following is an example of friction that is helpful?
a)
Brakes used on a bike
b)
Tires from a car on the road
c)
Tread on the bottom of your shoes
d)
All are examples that are helpful
3.
What is 'drag' another name for?
a)
dressing up
b)
air resistance
c)
friction
d)
weight
4.
What is the name for a single force on an object with the same effect as all the forces combined?
a)
big
b)
total
c)
resultant
d)
sum
5.
How can friction be reduced?
a)
reduce the force acting between the 2 surfaces
b)
reduce the roughness of the 2 surfaces coming in contact
c)
use wax, grease or oil
d)
all of the above are ways of reducing friction
6.

Which materials do not break easily and return to their original shape when forces acting on them are removed?

a)

Brittle

b)

Elastic

c)

plactic

d)

strong

7.

Robert Hooke investigates springs by seeing how a load affected their.....

a)

energy

b)

correlation

c)

temperature

d)

extension

8.

Hooke's Law can be shown on a graph as...

a)

a straight line

b)

a smooth curve

c)

joining dots

d)

a sigmoid shape

9.

Hooke's Law does not apply if....

a)

the spring is compressed

b)

The spring is stretched too far

c)

the spring is not made of steel

d)

masses are used instead of weights

10.

the elastic limit is the point at which ..

a)

the spring snaps

b)

there is no more room to attach masses

c)

the spring does not return to its original size

d)

the spring unravels

11.

A uniform plank is pivoted at its mid-point and a weight is added on either side in the positions shown.


The plank is balanced by the upward 2 N force.

What is weight X?

a)

4.0 N

b)

6.0 N

c)

10 N

d)

12 N

12.
Unit of force.
a)
Meter
b)
Centimeter
c)
Newton
13.
What is the moment acting on the seesaw?
a)
1.6Nm
b)
15Nm
c)
16N
d)
4Nm
14.

what causes gas pressure to increase?

a)

increased temperature

b)

increased amount of gas

c)

decreased volume

d)

all of the above

15.
The amount of force pushing on an area is the definition of....
a)
Fluid
b)
Viscosity
c)
Barometer
d)
Pressure
16.
Where would you find the largest pressure?
a)
At the bottom of the ocean
b)
At the top of Mt Everest
c)
Close to ground on the Scotch oval
d)
In a rockpool on the Great Barrier Reef
17.
Where is pressure the greatest on the dam?
a)
D
b)
C
c)
B
d)
A
18.
Pressure is equal to force divided by what
a)
area
b)
mass
c)
time
d)
distance
19.

Hydraulics are based on the concept that:

a)

Fluid is incompressible

b)

Fluid pressure is always unequal

c)

Fluid always takes the path of greatest resistance

d)

None of the above

20.

Hydraulic force is created in the ______________ and transmitted through the brake lines to the wheel cylinders.

a)

Brake Pedal

b)

Master Cylinder

c)

Brake Booster

d)

Force Multiplier

21.

When a boat is float on a river,

a)

its weight is larger than its upthrust.

b)

its upthrust is larger than its weight.

c)

its upthrust is equal to its weight.

22.
What pressure does a 4000N horse exert on the ground if each foot is 10cm2?
a)
40 N/cm2
b)
100 N/cm2
c)
400 N/cm2
d)
10 N/cm2
23.
Army tank tracks are useful for travelling through the mud because..
a)
they decrease the force the vehicle exerts on the ground
b)
they increase the force the vehicle exerts on the ground
c)
they decrease the pressure the vehicle exerts on the ground
d)
they increase the pressure the vehicle exerts on the ground
24.
Which of the statements is true?
a)
The bottom of the boot exerts more pressure than the shoe as a result of an increase in surface area.
b)
The bottom of the shoe exerts more pressure than the boot as a result of an decrease in surface area.
c)
The bottom of the shoe exerts the same pressure as the bottom of the boot.
25.
Look at the pressure triangle. How do we calculate the area?
a)
f ÷ a
b)
f x p
c)
p x f
d)
f ÷ p
26.
Look at the pressure triangle. How do we calculate the force?
a)
f ÷ a
b)
f x p
c)
p x a
d)
f ÷ p
27.
The pressure resulting from a force of 50 N exerted over an area of 5 m2 is
a)
10 N
b)
0.1 N
c)
10 N/m2
d)
0.1 Pa
28.
A person wearing steel toe capped boots and a person wearing stilleto heels stand on a wooden floor. They both have the same weight. Which person exerts a greater pressure on the floor?
a)
The person wearing the boots because the boots have a larger surface area in contact with the floor
b)
The person with the stiletto heels because they have a larger surface area in contact with the floor
c)
The person wearing the boots because the boots have a smaller surface area in contact with the floor 
d)
The person with the stiletto heels because they have a smaller surface area in contact with the floor

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