Term 4 Revision

Question 1

Definition of a Force

Answer 1

Forces are a Push, Pull, or twist… in a particular direction.

Question 2

What is an unbalanced force

Answer 2

a Change of motion speed and direction.

Question 3

What is a Balanced force

Answer 3

a constant force or no change is caused to the object if forces cancel each other out.

Question 4

Explain Air Resistance

Answer 4

For an object falling through the atmosphere, air resistance is the force acting against gravity.

Question 5

Explain Friction.

Answer 5

Friction is a contact force, it occurs when 2 surfaces are in contact with each other. Friction is a resistance against the movement of an object.

Question 6

What is gravity?

Answer 6

Gravity is a non-contact force that pulls on an object.

Question 7

Magnetism is a ….

Answer 7

Non-contact force.

Question 8

Mass is…

Answer 8

How much matter is inside of you.

Question 9

Weight is …

Answer 9

measure of the pull of gravity on your mass.

Question 10

What are Newtons? (N)

Answer 10

Newtons are the way we measure forces.(N)

Question 11

What Newton’s First law/ Inertia

Answer 11

An object in motion will stay in motion, or an object at rest will remain at rest unless acted upon by an external unbalanced force.

Question 12

Terminal Velocity is …

Answer 12

A point at when air resistance and gravity are the same and you stop accelerating

Question 13

Static friction…

Answer 13

Is the friction between stationary objects - bigger.

Question 14

Kinetic Friction is…

Answer 14

when there is friction between objects that move - smaller.

Question 15

Wanted Friction

Answer 15

writing on paper.

Question 16

Unwanted Friction

Answer 16

driving a car when friction is against you.

Question 17

Explain Buoyancy…

Answer 17

Buoyancyis an upward force (push) by a liquid on an object.

Question 18

Sinking?

Answer 18

Objects that sink push on a liquid. the object is displacing the liquid or pushes it aside.

Question 19

what is floating

Answer 19

The liquid pushes back on the object. This is referred to as buoyancy.
If the buoyancy exceeds theweight, then the object floats;

Question 20

Neutral Buoyancy

Answer 20

If the buoyancy equals the weight, the object hasneutral buoyancy.

Question 21

What is Density

Answer 21

how muchmassa substance has in a given space.

Question 22

What is the Formula for density?

Answer 22

D = m/V or density = mass/ volume

Question 23

Fulcrum

Answer 23

The turning point of a Lever is the Fulcrum.

Question 24

The Load

Answer 24

The Resistance to motion that a lever works against is the load.

Question 25

What is the Effort?

Answer 25

The force required to cause the motion is the effort.

Question 26

What is the Fulcrum?

Answer 26

The turning point of a lever is the fulcrum

Question 27

What is the Load?

Answer 27

The resistance to motion that a lever works against is the load

Question 28

What is a 1st class lever?
(EFL)

Answer 28

Fulcrum lies between the effort and the load
e.g. scissors

Question 29

What is a 2nd class lever?
(ELF)

Answer 29

The load is between the fulcrum and the effort.
The input is always further away from the fulcrum than the output, e.g. Wheelbarrow.

Question 30

What is a 3rd class lever?
(FEL)

Answer 30

Effort between the fulcrum and the load.
e.g Tweezers or Tongs.

Question 31

What is a Force multiplier?

Answer 31

1st and 2nd

Question 32

WHat is a speed multiplier?

Answer 32

3rd

Question 33

What is a simple machine?

Answer 33

Is when it is used