P5

Question 1

What is Newton’s first Law of Motion?

Answer 1

If the resultant force acting on an object is
zero and:
* the object is stationary, the object remains stationary
* the object is moving, the object continues to move at the
same speed and in the same direction.

Question 2

What is Newton’s second Law of Motion?

Answer 2

The acceleration of an object is proportional
to the resultant force acting on the object, and inversely
proportional to the mass of the object.
F = ma
Resultant force= mass x acceleration

Question 3

What is Newton’s third Law of Motion?

Answer 3

Whenever two objects interact, the forces they exert on each other
are: equal and opposite.

Question 4

List the CONTACT forces

Answer 4

-Friction
-Tension
-Air Resistance
-Normal Contact

Question 5

List the NON-CONTACT forces

Answer 5

-Magnetic
-Electrostatic
-Gravitational

Question 6

What is the formula for Force using spring constant and extension?

Answer 6

F=ke
Force (N)= spring constant (N/m) x extension (m)

Question 7

What is the relationship between the extension of a spring and force?

Answer 7

The extension of
a spring is
directly
proportional to
force until its
elastic limit.

Question 8

What are the four resultant forces that can act on an object?

Answer 8

-Lift (upwards)
-Weight (downwards)
-Drag (backwards)
-Thrust (forwards)

Question 9

What is the formula used to calculate Moments?

Answer 9

M= F x d
Moment (Nm)= Force (N) x distance (m)

d= perpendicular distance from the pivot to line of action of force(where force is being exerted)

Question 10

How do things like levers increase the size of the turning force?

Answer 10

They use moments to increase the size of a turning force by using a long lever.

Question 11

What do you have to remember to say when stating your answer as a moment?

Answer 11

Whether it is a clockwise or anticlockwise moment.

Question 12

What is the principle of moments?

Answer 12

If an object is balanced:
Clockwise moment (CWM) about a point=Anticlockwise moment (ACM) about the same point

Question 13

How do you calculate the turning forces of the masses used in the investigation for Moments?

Answer 13

W=mg
W(N)= mass(kg) x gravitational field strength(N/kg)
You do this calculation for both masses respectively

Question 14

What is the unit of Weight?

Answer 14

Newtons, N

Question 15

What is the unit of mass?

Answer 15

kilograms, kg

Question 16

What is weight the result of?

Answer 16

Gravity

Question 17

What is the gravitational field strength on Earth?

Answer 17

10 N/kg (ten newtons per kilogram).

Question 18

What is the equation for Work?

Answer 18

Work= Force x displacement

Question 19

What is the equation for Pressure?

Answer 19

Pressure(Pa)=Force(N)/Area(m^2)
P=F/A
Pa=Pascal

Question 20

What is the other equation of Pressure? (pressure of a liquid)

Answer 20

pressure(Pa) = height of column(m) × density of the liquid (kg/m^3)× gravitational field strength (N/kg)
p=hρg

Question 21

Define Upthrust

Answer 21

Upwards force exerted by a liquid or gas on an object floating in it.

-An object that is partly, or completely, submerged experiences a greater pressure on its bottom surface than on its top surface. This causes a resultant force upwards. This force is called upthrust.

Question 22

What is the rule of Upthrust?

Answer 22

If the upthrust is less than the weight of the object, the object will sink. If the upthrust is larger than the weight of the object, the object will float.

Question 23

Define a Moment

Answer 23

The turning effect of a force

Question 24

What is the pivot of an object also known as?

Answer 24

The fulcrum

Question 25

What is the conservation of Momentum?

Answer 25

In a closed system, the total momentum before an event is equal to the total momentum after an event.

Question 26

What is the terminal velocity of an object?

Answer 26

When the object reaches a constant velocity