- 7. If the velocity of an object doubles, its kinetic energy will: a) Remain the same b) Double c) Triple d) Quadruple 8. A3 kg object moves at a velocity of 4m/s What is the object's momentum? a) 3kgcdot m/s b) 12kgcdot m/s c) 7kgcdot m/s d) 16kgcdot m/s 9. In an inelastic collision, which of the following is true? a) Momentum is conserved but kinetic energy is not. b) Both momentum and kinetic energy are conserved. c) Only kinetic energy is conserved. d) Momentum is not conserved. 10. Which of the following forces is responsible for the acceleration of a rocket? a) Gravity b) Air resistance c) Thrust from the rocket engines d) Friction 11. Which statement best describes Newton's Third Law of Motion? a) An object at rest will stay at rest unless acted upon by an external force. b) The acceleration of an object is directly proportional to the net force and inversely proportional to its mass. c) For every action, there is an equal and opposite reaction. d) The momentum of an object is conserved. 12. What is the net force on an object of mass 10 kg, if the object is at rest and there is no applied force? a) 10 N b) 0 N c) 100 N d) 1N 13. A 50 N force is applied to an object causing it t to accelerate at 2m/s^2 What is the mass of the object? a) 25 kg b) 50 kg c) 75 kg
- 10. Wei saw a Special type of plastic that would melt and become der a desk. it was placed in the sun, but it would not melt when lamp does not? lamp. Why does light from the sun melt the plastic when light from the desk A Because the plastic can take in energy from the light from the sun but not from the light from the lamp. B Because light from the sun carries heat molecules, and light from the des lamp does not. C Because light from the sun pulls energy out of the plastic and light from desk lamp does not. D Because the sun gives off a type of light that carries energy, and light f the desk lamp does not.
- 1. Which of the following is NOT a form of mechanical energy? a) Kinetic Energy b) Gravitational Potential Energy c) Thermal Energy d) Elastic Potential Energy 2. A1,500 kg car accelerates from rest to 25m/s How much work is done on the car? a) 3,750 Joules b) 9,375 Joules c) 18,750 Joules d) 31,250 Joules 3. What is the impulse experienced by a 2 kg object if it is accelerated from 0m/s to 10m/s in 5 seconds? a) 5Ncdot s b) 10Ncdot s c) 15Ncdot s d) 20Ncdot s 4. What is the work-energy theorem? a) Work is the product of force and time. b) Work is done when a force causes a displacement. c) The change in an object's kinetic energy is equal to the work done on it. d) Energy cannot be converted from one form to another. 5. Which of the following scenarios is an example of negative work? a) A person lifts a box upward. b) A car brakes to slow down. c) A person pushes a sled across a flat surface. d) A rocket ascends into the sky. 6. A 0.5 kg ball is thrown vertically upwards with a velocity of 10m/s What is the maximum height the ball reaches? (Useg=9.8m/s^2) a) 1.0 m b) 5.1 m c) 10.2 m d) 20.4 m
- Question 4(1 point) If the earth's mass increased by a factor of 4 (Its density stays constant). What is the ratio of the earth's new volume to its original volume sqrt (2) 2 4 8
- Question 2 (1 point) A material with a Young's modulus of 2.6times 10^2N/m^2 has a length of 35.0 cm. The material has a mass hung from it which stretches it by 0.400 cm. What is the stress of the material?Give your answer to 2 decimal places. Your Answer: square
