An object is released at the top of a ramp and slides down it. If the ramp is frictionless does the speed of the object at the bottom depend in any way on the shape of the ramp? Explain. What if there is friction present? Will the ramp’s shape affect its final speed? Explain.

At the playground, Logan slides down each of the frictionless slides shown. At the top, he is given a push so that he has the same initial speed each time. At the bottom of which slide is he moving the fastest? Slide A Slide B Slide C a. Slide A o b. All slide are the same O c. Slide B O d. Slide C

2) You are driving 2018 Honda Civic and are stuck behind 2018 Toyota Tundra. a) What is the increase in kinetic energy of your car as you speed up from 5 m/s to 12 m/s? b) What is the increase in kinetic energy of your car as you speed up from 12 m/s to 19 m/s? c) What do you conclude form (a) and (b)?

Homework

A 78-kg skydiver has a speed of 62 m/s at an altitude of 870 m above the ground. a. Determine the kinetic energy possessed by the skydiver.b. Determine the potential energy possessed by the skydiver.c. Determine the total mechanical energy possessed by the skydiver.

3. Which of the following statements correctly describes the relationship between an objects kinetic energy and its speed? a. E k is directly proportional to the speed of the object b. E k is directly proportional to the speed squared of the object c. E k is inversely proportional to the speed of the object d. E k is inversely proportional to the speed squared of the object e. none of the above describe the relationship

For exercise, an athlete lifts a barbell that weighs 400 N from the ground to a height of 2.20 m at a constant speed in a time of 1.60 s. For the second time, the athlete completes the same task in 1.50 s. Match the answers with questions.                                                             metabolic energy                                                             metabolic power A. decreases B. increases C. not enough information D. stays the same

A student stands at the top of a building of height 50 m. He throws two identical balls with a speed of 20m/s, one up, the other down. If air resistance is included which ball strikes the ground with higher speed? A. The ball thrown upward B. The ball thrown downward C. Both balls will have the Same speed

A 1400 kg car delivers a constant 42 hp to the drive wheels. We assume the car is traveling on a level road and that all frictional forces may be ignored.A) What is the acceleration of this car when its speed is 10 m/s?B) If the speed of the car is doubled, does its acceleration increase, decrease, or stay the same? Explain

In the figure, a small, initially stationary block is released on a frictionless ramp at a height of 3.0 m. Hill heights along the ramp are as shown in the figure. The hills have identical circular tops, and the block does not fly off any hill. Which hill is the first the block cannot cross? What does the block do after failing to cross that hill? The normal force on the block least? * 3.5 m (4) 2.5 m 1.5 m (3) 3.0 m (2) 0.5 m O 3, Moves backwards, at the top of 1 O 3, oscillates between 2 an 3, at the bottom of 2 and 3 O 4, Moves backwards, at the top of 3 O 3, Moves backwards, at the top of 3