Physics · Unit 2 · Linear motion and force · Linear motion
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A box of mass 15.0 kg is pushed along a horizontal frictionless surface by a constant horizontal force of 45.0 N through a displacement of 8.00 m. The box starts from rest. What is the final kinetic energy of the box?
Describe the energy transformation that occurs when a ball is thrown vertically upward from ground level until it reaches its maximum height.
A cyclist applies a constant braking force while travelling down a hill. The cyclist's speed remains constant throughout the descent. Describe how mechanical work, kinetic energy and gravitational potential energy are related during this motion.
A student pushes a 15 kg box across a horizontal warehouse floor by applying a constant horizontal force of 80 N over a distance of 6.0 m. The box accelerates from rest to a final speed of 3.2 m s⁻¹. The student then lifts the box vertically onto a shelf 1.8 m above the floor. Describe the energy transformations that occur during the pushing phase, referencing the concepts of mechanical work, kinetic energy and gravitational potential energy.