Kinematics I
A car travels 200 m in 10 s. What is its speed?
20 m s⁻¹
What is the difference between speed and velocity?
Speed is scalar (magnitude only), velocity is vector (magnitude + direction)
State Newton's First Law
An object remains at rest or moves at constant velocity unless acted on by an unbalanced net force.
Write the formula for Newton's Second Law
F = m × a
State Newton's Third Law
For every action force there is an equal and opposite reaction force
Convert 54 km/h to m s⁻¹
15 m s⁻¹
A runner goes 6 m north then 6 m south. What is their displacement
0 m
What is inertia?
The tendency of an object to resist any change in its motion.
Swap Points with any team (you cannot choose not to swap)
???
Name the four properties of a Newton's Third Law force pair
Equal in size, opposite in direction, same type, act on different objects
Pick any team to lose 100 points
???
A sprinter accelerates from 0 to 8 m s⁻¹ in 4 s. What is their acceleration?
2 m s⁻²
A hockey puck slides on ice and gradually stops. Which force is responsible?
Friction
A 70 kg runner accelerates at 3 m s⁻². What is the net force?
210 N
Why don't action and reaction forces cancel each other out
They act on different objects — forces only cancel when they act on the same object
A runner covers 400 m at 5 m s⁻¹. How long does it take?
80 s
A ball decelerates from 12 m s⁻¹ to 3 m s⁻¹ over 3 s. Calculate the acceleration.
−3 m s⁻²
A passenger lurches forward when a bus brakes suddenly. Explain why using Newton's First Law.
The passenger's inertia keeps them moving forward while the bus decelerates
A net force of 300 N acts on an object producing an acceleration of 5 m s⁻². What is the mass?
60 kg
A rocket expels gas downward at 500 N. What force propels the rocket upward and why
500 N upward — equal and opposite reaction force acts on the rocket
On a distance-time graph, what does a steeper gradient mean?
Faster Speed
A runner's displacement changes from 10 m to 25 m over 2.5 s. Calculate their average velocity.
6 m s⁻¹
On a velocity-time graph, which sections have no net force acting
Flat/horizontal sections — constant velocity means forces are balanced
A sprinter of mass 80 kg produces a force of 400 N. They gain 8 kg but produce the same force. What is their new acceleration?
400 ÷ 88 = 4.55 m s⁻²
9 + 10
19