Motion along a straight lineAQA A-Level Physics: Flashcards
What these 12 flashcards ask
- Define displacement.
- Write the equation for velocity.
- Define acceleration.
- How is instantaneous velocity found from a displacement–time graph?
- What does the area under a velocity–time graph represent?
- What does the area under an acceleration–time graph represent?
- State the four equations of uniform acceleration.
- When can the equations of motion be used?
- What is the gradient of a velocity–time graph for a ball in free fall (upward positive)?
- In RP3, what do you plot to find g from a free-fall experiment?
- How can random errors be reduced in the free-fall experiment?
- What does a non-zero intercept on the t² against h graph suggest?
Exam questions on Motion along a straight line
- A cyclist starts from rest and accelerates uniformly at 1.2 m s⁻² along a straight, level road for 10 s.The cyclist then brakes uniformly and stops in 4.0 s. Calculate the distance travelled while braking.2 marks
- A small ball is released from rest above a hard floor and falls freely, hitting the floor 0.60 s later. It rebounds vertically with a speed of 4.4 m s⁻¹. Ignore air resistance and take g = 9.81 m s⁻².Calculate the maximum height reached by the ball after the first bounce.2 marks
- A student determines the acceleration of free fall, g, by dropping a steel ball from rest from different heights h above a trapdoor. An electromagnet holds the ball and an electronic timer starts when the ball is released and stops when the ball hits the trapdoor. She measures the fall time t for each height and plots a graph of t² against h.Explain why this graph should be a straight line through the origin, and state what its gradient equals.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).