physicsRP7 · ForcesPaper 2Combined and Separate

Acceleration

Method overview

Set up trolley with motion sensor/light gates. Change resultant force while keeping total mass constant, or change mass while keeping force constant. Release without push, record acceleration and repeat.

Apparatus set-up

Diagram

trolley; ramp; light gates/motion sensor; data logger; metre ruler; masses; pulley; ticker timer

Independent variable

resultant force or total mass

Dependent variable

acceleration

Control variables

track angle/friction; trolley system; starting position; force/mass depending investigation

Apparatus

trolley; ramp; light gates/motion sensor; data logger; metre ruler; masses; pulley; ticker timer

Safety

Secure track/pulley; use a stop block; keep feet clear of falling masses.

Scientific rationale

Controlling mass isolates F effect; controlling force isolates m effect; release without push avoids extra force.

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