Exercise Take g = 9.8ms-2 1 A boy and his skateboard of total mass 60kg coasts down a frictionless ramp at an angle of 30° to the horizontal. (a) Calculate the normal force acting on the boy and skateboard. (b) Calculate the force acting on the boy and skateboard parallel to the ramp. 2 The boy now coasts down another ramp, but this time the ramp has a rough surface. (a) Calculate the normal force acting on the boy and skateboard. (b) Calculate the force acting on the boy and skateboard parallel to the ramp. (c) If the ramp has a frictional force of 54N, what is the net force acting on the boy and the skateboard? (d) Calculate the acceleration of the boy. (e) If the boy started from rest, and the ramp is 4m long, what was the speed of the boy at the bottom of the ramp

Exercise Take g = 9.8ms-2 1 A boy and his skateboard of total mass 60kg coasts down a frictionless ramp at an angle of 30° to the horizontal. (a) Calculate the normal force acting on the boy and skateboard. (b) Calculate the force acting on the boy and skateboard parallel to the ramp. 2 The boy now coasts down another ramp, but this time the ramp has a rough surface. (a) Calculate the normal force acting on the boy and skateboard. (b) Calculate the force acting on the boy and skateboard parallel to the ramp. (c) If the ramp has a frictional force of 54N, what is the net force acting on the boy and the skateboard? (d) Calculate the acceleration of the boy. (e) If the boy started from rest, and the ramp is 4m long, what was the speed of the boy at the bottom of the ramp