State what is meant by the principle of conservation of energy.
An athlete throws a heavy medicine ball.
State the energy changes that take place from when the athlete begins to exert a force on the ball until the ball hits the ground and stops moving.
An athlete throws a heavy medicine ball.
The mass of the medicine ball is 5.0 kg5.0\text{ kg}5.0 kg. The athlete exerts a force on the ball for 0.50 s0.50\text{ s}0.50 s. The speed of the ball increases from 0 m/s0\text{ m/s}0 m/s to 14 m/s14\text{ m/s}14 m/s before it leaves the athlete's hands.
Calculate the momentum of the ball as it leaves the athlete's hands.
An athlete throws a heavy medicine ball.
The mass of the medicine ball is 5.0 kg5.0\text{ kg}5.0 kg. The athlete exerts a force on the ball for 0.50 s0.50\text{ s}0.50 s. The speed of the ball increases from 0 m/s0\text{ m/s}0 m/s to 14 m/s14\text{ m/s}14 m/s before it leaves the athlete's hands.
Calculate the average resultant force exerted on the ball.
229 exam-style questions on CIE IGCSE Physics 1.7.1a Energy stores and energy transfers. Each one has a worked solution and a mark scheme showing where the marks go.