Need help with these mock exam questions.
1. A box is pulled forward along a frictionless horizontal surface using a rope angled at 20° above the horizontal. The force pulling the block is 250N along the handles. Draw a suitable diagram showing the force in the handles, and its horizontal and vertical components, and use trigonometry to calculate the force parallel to the surface. What is the force in a direction perpendicular to the surface?
2. A 90 kg box is placed on a frictionless track inclined at 25° to the horizontal. Draw a diagram of this identifying the relevant forces, e.g force due to gravity, forces normal and tangential to the track. What is the magnitude of the force on the box normal to the track? Calculate the tangential force and hence the acceleration of the box down the track.
3. A van of mass 1750kg is travelling along a road at 23m/s along a road when it runs into the back of a car of mass 800kg that is travelling in the same direction at 15m/s. After the collision the 1750kg van travels at a speed of 19m/s in the same direction. Use the principle of the conservation of momentum to calculate the speed of the 800kg car after the collision
What is the combined kinetic energy of the boats before and after collision? Is Kinetic Energy conserved?
4. A rollercoaster carriage weighing 225kg travels down a frictionless roller starting at a height of 18m above the ground. The rollercoaster track goes down to 1m above the ground as it curves back up to a peak at 10m before falling again
Using the conservation of mechanical energy, determine the kinetic energy of the carriage at the lowest point after the start. How fast is the sack travelling when it travels through the lowest point?
How fast will it be travelling as it passes over the next peak?