P3

Question 1

What is the equation that links charge flow (Q), current (I) and time (F)

Answer 1

Q = I * T

Question 2

What is the equation for volume?

Answer 2

Volume = length x width x height

Question 3

What is meant by an object freely suspended

Answer 3

the object has returned to its equilibrium position after the turning force is taken away.

Question 4

What are some examples of scalars?

Answer 4

Speed, temperature, distance, area, entropy and volume

Question 5

What are examples of vectors?

Answer 5

Velocity, acceleration, displacement, force, momentum and drag

Question 6

Define resultant force

Answer 6

The result of 2 vector forces acting against eachother

Question 7

Equation for velocity

Answer 7

Velocity = speed + direction

Question 8

Equation for clockwise movement

Answer 8

Total clockwise movement = total anticlockwise movement

Question 9

How can a vector quantity be drawn and what does it show?

Answer 9

● As an arrow
● The length of the arrow represents the
magnitude
● The arrow points in the associated
direction

Question 10

What is a force?

Answer 10

A push or pull acting on an object due to an interaction with another object.

Question 11

What are the two categories that all forces can be split into?

Answer 11

1. Contact forces (objects touching)
2. Non-contact forces (objects separated)

Question 12

Give three examples of contact forces.

Answer 12

1. Friction
2. Air resistance
3. Tension

Question 13

Give three examples of non-contact forces.

Answer 13

1. Gravitational forces
2. Electrostatic forces
3. Magnetic forces

Question 14

Is force a vector or a scalar quantity?

Answer 14

● Vector
● It has both a magnitude and an
associated direction

Question 15

Give three examples of vector quantities.

Answer 15

1. Velocity
2. Displacement
3. Force

Question 16

Give three examples of scalar quantities.

Answer 16

● Temperature ● Time
● Mass
● Speed
● Distance ● Energy

Question 17

What is weight?

Answer 17

The force that acts on an object due to gravity and the object’s mass.

Question 18

What quantities does weight depend on?

Answer 18

Weight = mass x gravitational field strength

Question 19

What is the unit used for weight?

Answer 19

The Newton (N).

Question 20

What is the unit used for gravitational field strength?

Answer 20

N/kg

Question 21

What is meant by an object’s centre of mass?

Answer 21

The single point where an object’s weight can be considered to act through.

Question 22

What piece of equipment can be used to measure an objects weight?

Answer 22

A calibrated spring-balance or newton- meter.

Question 23

What is the name given to the single force that is equivalent to all the other forces acting on a given object?

Answer 23

The resultant force.

Question 24

If an object moves 3 metres to the left and then 3 metres back to its initial position, what is the object’s total displacement?

Answer 24

● The object has zero displacement
● Displacement is a vector quantity so it also
involves direction
● The object starts and ends at the same point

Question 25

State the equation linking distance, speed and time. Give appropriate units.

Answer 25

Distance = Speed x Time Distance (m), Speed (m/s), Time (s)

Question 26

Newton's 3rd law

Answer 26

When 2 objects interact with eachother they exert equal and opposite forces on eachother

Question 27

Newton's 2nd law

Answer 27

In order to make an object move from rest, the forces must be unequal

Question 28

What is inertia?

Answer 28

The tendency of an object to continue in its state of rest or uniform motion.

Question 29

What is an alternative name for the turning effect of a force?

Answer 29

A moment

Question 30

State the equation used to calculate the moment of a force. Give appropriate units.

Answer 30

Moment of force = Force x Distance Moment (Nm), Force (N), Distance (m)

Question 31

What distance measurement is used when calculating a moment?

Answer 31

The perpendicular distance from the pivot to the line of action of the force.

Question 32

If an object is in equilibrium, what can be said about the moments acting on the object?

Answer 32

The clockwise moments are equal to the anticlockwise moments.

Question 33

What three parts make up a lever system?

Answer 33

1. Load 2. Effort 3. Pivot

Question 34

Give an example of when a lever may be used to multiply a force.

Answer 34

A wrench, which has a long handle so that the force applied by the user is multiplied.

Question 35

What determines the moment of a gear wheel?

Answer 35

The size of the wheel.