Physics - Unit 1

Front 1

Scalar

Back 1

A scalar quantity has magnitude (size) only.

Front 2

Vector

Back 2

A vector quantity has magnitude (size) and distance.

Front 3

Acceleration

Back 3

The change in velocity per unit time.

Front 4

N1

Back 4

An object will remain at rest or move at a constant speed unless acted on by an unbalanced force.

Front 5

N2

Back 5

F=ma.

Front 6

N3

Back 6

For every action, there is an equal but opposite reaction.

Front 7

Newton

Back 7

The constant unbalanced force which causes a mass of 1kg to accelerate at 1m/s-2.

Front 8

Momentum

Back 8

By conversation of momentum, total momentum before equals the total momentum after in the absence of external forces.

Front 9

Inelastic Collision

Back 9

Generally, the colliding bodies stick together after the collision.

Front 10

Elastic Collision

Back 10

Generally, the colliding bodies separate after the collision.

Front 11

Density.

Back 11

The mass of a material per unit volume.

Front 12

Upthrust

Back 12

Pressure is directly proportional to depth. The greater the depth the greater the pressure. Bottom surface of object has greater pressure/force than top surface. This gives rise to unbalanced force upwards.

Front 13

Absolute Zero

Back 13

At -273degreescelcius or 0K, gas pressure would be zero, so molecules would have zero velocity and zero kinetic energy. Therefore no more hear energy can be taken from them, hence it is the lowest possible temperature.