Topic 6: Further Forces

Question 1

Acceleration:

Answer 1

Change of velocity per second (in metres per second per second, m/s2).

Question 2

Braking distance:

Answer 2

The distance travelled by a vehicle during the time it takes for its brakes to act.

Question 3

Conservation of momentum:

Answer 3

In a closed system, the total momentum before an event is equal to the total momentum after the event. Momentum is conserved in any collision or explosion, provided no external forces act on the objects that collide or explode.

Question 4

Deceleration:

Answer 4

Change of velocity per second when an object slows down.

Question 5

Directly proportional:

Answer 5

A graph will show this if the line of best fit is a straight line through the origin.

Question 6

Displacement:

Answer 6

Distance in a given direction.

Question 7

Extension:

Answer 7

The increase in length of a spring (or a strip of material) from its original length.

Question 8

Free-body force diagram:

Answer 8

A diagram that shows the forces acting on an object without any other objects or forces shown.

Question 9

Gradient (of a straight line graph):

Answer 9

Change of the quantity plotted on the y-axis divided by the change of the quantity plotted on the x-axis.

Question 10

Gravitational field strength, g:

Answer 10

The force of gravity on an object of mass 1kg (in newtons per kilogram, N/kg). It is also the acceleration of free fall.

Question 11

Limit of proportionality:

Answer 11

The limit for Hooke’s law applied to the extension of a stretched spring.

Question 12

Mass:

Answer 12

The quantity of matter in an object - a measure of the difficulty of changing the motion of an object (in kilograms, kg).

Question 13

Parallelogram of forces:

Answer 13

A geometrical method used to find the resultant of two forces that do not act along the same line.

Question 14

Weight:

Answer 14

The force of gravity on an object (in newtons, N).

Question 15

Force:

Answer 15

A force is a push or pull that acts upon an object as a result of that object’s interactions with its surroundings.

Question 16

What is force measured in?

Answer 16

Newtons (N).

Question 17

Force has both..

Answer 17

• A magnitude .
• A direction.

Question 18

Is force a scalar or vector quantity? Explain why.

Answer 18

Force has both a magnitude and a direction. Therefore, force is a vector quantity.

Question 19

Name 3 examples of a contact force:

Answer 19

1. Friction force.
2. Tension force.
3. Normal contact force.

Question 20

Name 5 examples of a non-contact force:

Answer 20

1. Magnetic force.
2. Electrostatic force.
3. Gravitational force.
   4.Weight (force due to gravity).
4. Electromagnetism force.

Question 21

Is air resistance a contact or non-contact force? Explain why.

Answer 21

Air resistance is a contact force. This is because it is due to the physical contact (collisions) between an object and the particles in the air.

Question 22

What is a contact force?

Answer 22

A contact force is any force that occurs as a result of two objects making physical contact with each other.

Question 23

What is a non-contact force?

Answer 23

A non-contact force is a force which acts on an object without coming into physical contact with it.

Question 24

Is tension a contact or non-contact force?

Answer 24

Tension is a contact force.

Question 25

Is friction a contact or non-contact force?

Answer 25

Friction is a contact force.

Question 26

Is weight (the force of gravity acting on an object) a contact or non-contact force?

Answer 26

Weight is a non-contact force.

Question 27

Is normal contact force a contact or non-contact force?

Answer 27

Normal contact force is a contact force.

Question 28

Is electromagnetism a contact or non-contact force?

Answer 28

Electromagnetism is a non-contact force.

Question 29

Is magnetic force a contact or non-contact force?

Answer 29

Magnetic force is a non-contact force.

Question 30

Is air resistance a contact or non-contact force?

Answer 30

Air resistance is a contact force.