Motion

Question 1

Distance

Answer 1

The length of the space between one point and another.

Question 2

Speed

Answer 2

The distance travelled per unit of time.

Question 3

Time

Answer 3

A measurable period in which events or an event occurs.

Question 4

Scalar

Answer 4

A measurable period in which events or an event occurs.

Question 5

Vector

Answer 5

A physical quantity that has both magnitude and direction.

Question 6

Displacement

Answer 6

Distance in a given direction. For example, 50 m north east. It is also the shortest distance between two points.

Question 7

Velocity

Answer 7

Speed in a given direction. For example, 100 km/h south. Velocity of an object can be calculated by dividing the displacement of an object by the time taken to undergo that displacement.

Question 8

Distance-time graph

Answer 8

Shows the distance something travels over the time taken to travel that distance. It is normally drawn by plotting the distance travelled on the y-axis and the time taken for the journey on the x-axis.

Question 9

Acceleration

Answer 9

The change in velocity per second
Measured in metre per second per second (m/s/s) or metre per second
Can be written as ms-2 or m/2(squared)

Question 10

Force

Answer 10

Forces explain why an object moves the way it does, why things stretch, twist, tear, snap, bend, break, speed up, slow down and change shape. Pushes and pulls are types of force.

Question 11

Contact forces

Answer 11

Two objects have to be in contact for these forces to occur.

Question 12

Non-contact forces

Answer 12

Forces where objects do not have to be in contact for the forces to occur.

Question 13

Interaction pair

Answer 13

Pairs of forces that occur together.

Question 14

Newton metre

Answer 14

A device used to measure forces. Also known as a spring balance.

Question 15

Force metre

Answer 15

Used to measure forces digitally.

Question 16

Balanced(forces)

Answer 16

When an object does not move because competing forces cancel each other out, we say the forces are balanced.

Question 17

Equilibrium

Answer 17

An object is in equilibrium when it is subject to balanced forces.

Question 18

Unbalanced

Answer 18

When one force on an object is stronger than another force, the forces are unbalanced. Unbalanced forces cause objects to speed up, slow down or change direction.

Question 19

Dynamic equilibrium

Answer 19

When an object has balanced forces acting upon it when it is moving.

Question 20

Friction

Answer 20

A force that opposes motion when two objects are placed in contact.

Question 21

Drag forces

Answer 21

Forms of friction, such as water resistance and air resistance.

Question 22

Lubrication

Answer 22

Friction between solids can be reduced by using lubrication. Examples of lubricants include oil and wax.

Question 23

Streamlining

Answer 23

Involves creating a smooth surface and an aerodynamic shape. Drag forces in wind and air can be reduced by streamlining.

Question 24

Advantages of friction

Answer 24

We can play sports
Put nails in wall
Stack things

Question 25

Disadvantages of friction

Answer 25

Causes tear in moving parts of machines Oppose motion Produce noise Produce heat in moving parts

Question 26

Weight is a force

Answer 26

When gravity acts on our mass,we can find our weight Mass is measured in kilograms,acceleration due to gravity is measured in m/s squared,as weight is a force,it’s measured in Newton’s. Force=mass x acceleration Weight=mass x gravity.

Question 27

Hooked law

Answer 27

The extension of an elastic body(a spring) is directly proportional to the force applied to it.