1. Forces and Motion - Physics

What are the SI units for mass, distance, speed, acceleration, force, time, and field strength?

kg, m, m/s, m/s², N, s, N/kg

What additional units are used for triple science?

Nm, kg·m/s

What graph shows how distance changes over time?

Distance-time graph

What is the formula for average speed?

speed = distance ÷ time

What is the formula for acceleration?

a = Δv ÷ t

How do you find acceleration from a graph?

From the gradient of a velocity-time graph

How do you find distance from a velocity-time graph?

From the area under the graph

What is the formula linking final speed, initial speed, acceleration, and distance?

v² = u² + 2as

How do forces affect objects?

Change speed, shape, or direction

Name two types of forces.

Gravitational, electrostatic

What is the difference between vector and scalar quantities?

Vector has magnitude and direction; scalar has magnitude only

What is the formula for unbalanced force?

F = ma

What is the formula for weight?

W = mg

What is stopping distance made of?

Thinking distance + braking distance

What factors affect vehicle stopping distance?

Speed, mass, road condition, reaction time

What is Hooke's law associated with?

Initial linear region of a force-extension graph

What is the formula for momentum?

p = mv

What is the relationship between force, change in momentum, and time?

F = Δp ÷ t

What is the principle of moments formula?

Moment = force × perpendicular distance