A block of mass m m\,m slides down a rough incline of constant angle θ \theta\,θ at a constant velocity. The block is then replaced with a block of mass 3m made of the exact same material. The new block is given the same initial velocity down the incline.
Which statement correctly describes the subsequent motion of the new block?
The new block accelerates down the incline because the gravitational force component down the slope has tripled.
The new block decelerates and comes to rest because the frictional force has tripled.
The new block slides down the incline at a constant velocity because both the gravitational force component and the frictional force have tripled.
The new block accelerates down the incline with an acceleration equal to 3gsinθ3g \sin\theta3gsinθ.
84 exam-style questions on AQA A Level Physics Force, energy and momentum, covering Scalars and vectors, Moments, Motion along a straight line, Projectile motion, Newton's laws of motion, Momentum, Work, energy and power, and Conservation of energy. Each one has a worked solution and a mark scheme showing where the marks go.