A skateboarder, starting from the top of a ramp 4,5 m above the ground, skates downthe ramp, as shown in the diagram below. The mass of the skateboarder and his boardis 65 kg. Ignore the effects of friction. 5.1 Define the term gravitational potential energy in words. (2) 5.2 Calculate the gravitational potential energy of … Read more
Two cars, A and B, are moving at speeds of 15 m·s-1 and 30 m·s-1 in the samedirection. They are side by side when both drivers observe an obstruction ahead ofthem, as shown in the diagram below. Both drivers apply their brakes and accelerate at –4,5 m·s-2 until both cars come torest. Ignore the reaction … Read more
The diagram below shows the positions of an athlete at different time intervals during arace. 3.1 Distinguish between motion with uniform velocity and uniformly accelerated motion. (4) 3.2 What type of motion (motion with uniform velocity or uniformly accelerated motion) is represented by the following intervals? 3.2.1 A to B (1) 3.2.2 B to C … Read more
A baby leaves a bowl of food on the floor and crawls westwards to fetch a toy placed 5 maway. At the same time a dog walks eastwards towards the baby. It takes the baby 30 sto reach the toy. The dog walks past the toy to eat the baby’s food in the bowl. 2.1 … Read more
Various options are provided as possible answers to the following questions. Eachquestion has only ONE correct answer. Choose the answer and write only the letter(A–D) next to the question numbers (1.1 to 1.10) in the ANSWER BOOK, e.g. 1.11 D. 1.1 An object is positively charged if it has more … A electrons than protons.B … Read more