Projectile motion and resistive forcesAQA A-Level Physics: Flashcards
What these 13 flashcards ask
- How do the horizontal and vertical motions of a projectile compare?
- What is the horizontal acceleration of a projectile with no air resistance?
- How do you find the time of flight of a projectile?
- What is the speed of a projectile at its highest point?
- How does air resistance depend on speed?
- What is terminal speed?
- Why does a falling object's acceleration decrease?
- What happens when a skydiver opens a parachute?
- How does air resistance change the trajectory of a projectile?
- What is the acceleration of a projectile on the way up when air resistance acts?
- What is lift?
- What determines the maximum speed of a car?
- How can the maximum speed of a vehicle be increased?
Exam questions on Projectile motion and resistive forces
- A stone is thrown horizontally at 12 m s⁻¹ from the top of a vertical cliff that is 45 m above the sea. Ignore air resistance and take g = 9.81 m s⁻².Calculate the speed of the stone as it reaches the sea.2 marks
- A football is kicked from level ground with a speed of 20 m s⁻¹ at 35° above the horizontal. Ignore air resistance and take g = 9.81 m s⁻².Explain why the speed of the ball is a minimum at the highest point of its flight.2 marks
- A skydiver of mass 80 kg jumps from a stationary balloon and falls vertically. Her speed increases at first and she eventually reaches a constant terminal speed. Take g = 9.81 m s⁻².Explain, in terms of the forces on the skydiver, why her acceleration decreases and she reaches a terminal speed.3 marks
Written by the Exaim team, led by Shaun Daswani (Head of Upper Secondary, Improve ME Institute; MSc Financial Mathematics, Imperial College London; BSc, UCL) and Jason Daswani (operational lead, Improve ME Institute; LSE).