Weight and motion under gravityEdexcel A-Level Maths: Flashcards

What these 12 flashcards ask

Formula for weight?
Default value of g in this course?
How do mass and weight change from Earth to the Moon?
Is g a universal constant?
What is the acceleration of a body moving freely under gravity?
What is the velocity at the highest point of a vertical throw?
Greatest height for a vertical throw at speed u?
Time of flight of a vertical throw from the ground?
How are the speeds at a given height related going up and down?
What is u for a body dropped from rest?
A ball is thrown up from 1.5 m above the ground. What is s when it hits the ground?
What do you do with a negative root for t?

Exam questions on Weight and motion under gravity

A ball is thrown vertically upwards with speed $14$ m s $^{-1}$ from ground level. Model the ball as a particle moving freely under gravity, with $g=9.8$ m s $^{-2}$ .
Find the speed of the ball when it is $4$ m above the ground on its way down.2 marks
A coin is dropped from rest from a bridge, $40$ m above the surface of a river. Model the coin as a particle moving freely under gravity, with $g=9.8$ m s $^{-2}$ .
Find the distance the coin falls in the last second before it reaches the river.2 marks
A ball is thrown vertically upwards with speed $15$ m s $^{-1}$ from a point $1.5$ m above horizontal ground. Model the ball as a particle moving freely under gravity, with $g=9.8$ m s $^{-2}$ .
Find the greatest height of the ball above the ground.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).