Work and Energy 5. What is a force? a. change in speed over time b. the tendency to resist change in motion c. a push or pull d. apparent weightlessness.

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Presentation transcript:

Work and Energy 5. What is a force? a. change in speed over time b. the tendency to resist change in motion c. a push or pull d. apparent weightlessness

Work and Energy 5. What is a force? a. change in speed over time b. the tendency to resist change in motion c. a push or pull d. apparent weightlessness

Work and Energy 9. What is the result of a net force acting on an object? a. the object will accelerate b. the object remain motionless c. the object’s velocity will not change d. inertia is greater than net forces

Work and Energy 9. What is the result of a net force acting on an object? a. the object will accelerate b. the object remain motionless c. the object’s velocity will not change d. inertia is greater than net forces

Work and Energy Which of the following does NOT represent work being done. a. You lift a 4 kg box 1.5 m to the table. b. You pull a wagon 10 meters. c. You hold the door open for your mom. d. You push a desk across the floor.

Work and Energy Which of the following does NOT represent work being done. a. You lift a 4 kg box 1.5 m to the table. b. You pull a wagon 10 meters. c. You hold the door open for your mom. Why? d. You push a desk across the floor.

Work and Energy Which of the following does NOT represent work being done. c. You hold the door open for your mom. Why? Even though you apply force to to keep the door open, the door does not move.

Work and Energy The amount of work done in a specified amount of time is called a. joules b. resistance c. power d. Mechanical advantage

Work and Energy The amount of work done in a specified amount of time is called a. joules b. resistance c. power d. Mechanical advantage

Work and Energy An object that is only acting under the influence of gravity is ___________ a. decelerating b. in free fall c. stationary d. weightless

Work and Energy An object that is only acting under the influence of gravity is ___________ a. decelerating b. in free fall c. stationary d. weightless

Work and Energy For every force there is an equal and opposite reaction force is a. Newton's 1 st Law of Motion b. Newton's 2 nd of Motion c. Newton's 3 rd Law of Motion d. Newton's 4 th Law of Motion

Work and Energy For every force there is an equal and opposite reaction force is a. Newton's 1 st Law of Motion b. Newton's 2 nd of Motion c. Newton's 3 rd Law of Motion d. Newton's 4 th Law of Motion

Work and Energy What is the gravitational acceleration constant on earth? a. 9.8 m/s b.98 m/s c.9.8 m/s 2 d.982 mph

Work and Energy What is the gravitational acceleration constant on earth? a. 9.8 m/s b.98 m/s c.9.8 m/s 2 d.982 mph

Work and Energy Which state of matter is completely compressed, retains its shape, and represents the lowest form of kinetic energy among its molecules? Drop of a Bullet

Work and Energy Which state of matter is completely compressed, retains its shape, and represents the lowest form of kinetic energy among its molecules? solids Drop of a Bullet

Work and Energy What is the equation for calculating kinetic energy? Drop of a Bullet

Work and Energy What is the equation for calculating kinetic energy? KE = ½ mv 2 OR Drop of a Bullet

Work and Energy Kinetic energy is expressed in what units? Drop of a Bullet

Work and Energy Energy is measured in what units? Joules J Drop of a Bullet

Work and Energy What is the kinetic energy of a 5kg object traveling at 10m/s? Drop of a Bullet

Work and Energy What is the kinetic energy of a 5kg object traveling at 10m/s? KE = ½ mv 2 KE = 5kg x (10m/s) 2 2 = 250 J Drop of a Bullet

Work and Energy What is the equation for calculating gravitational potential energy? Drop of a Bullet

Work and Energy What is the equation for calculating potential energy? PE = mgh What do the letters stand for?

Work and Energy What is the equation for calculating potential energy? PE = mgh What do the letters stand for? m = mass g = gravity (9.8m/s 2 ) h = height of the object in m

Work and Energy A 1.5 kg coconut hangs in a palm tree? How much gravitational potential energy does the coconut have if the tree is 15 meters tall? Drop of a Bullet

Work and Energy A 1.5 kg coconut hangs in a palm tree? How much gravitational potential energy does the coconut have if the tree is 15 meters tall? PE = mgh = (1.5 kg)(9.8m/s2)(15 m) 220 J Drop of a Bullet

Work and Energy A rollercoaster car with a mass of 500 kg has 600 J of potential energy. How tall is the rollercoaster? PE = mgh so = 600 kJ/(9.8m/s 2 x 500kg) = 122 m Drop of a Bullet

Work and Energy What is the mechanical energy of a 40 kg child swinging at the moment her velocity is 20 m/s and she is 2 m off of the ground? Drop of a Bullet

Work and Energy What is the mechanical energy of a 40 kg child swinging at the moment her velocity is 20 m/s and she is 2 m off of the ground? Hint: Mechanical Energy = KE + PE Calculate each and sum. Drop of a Bullet

Work and Energy Calculate the mechanical energy of a 40 kg child swinging at the moment her velocity is 20 m/s and she is 2 m off of the ground? Hint: Mechanical Energy = KE + PE Drop of a Bullet

Work and Energy Calculate the mechanical energy of a 40 kg child swinging at the moment her velocity is 20 m/s and she is 2 m off of the ground? Hint: Mechanical Energy = KE + PE Drop of a Bullet

Work and Energy What is the mechanical energy of a 40 kg child swinging at the moment her velocity is 20 m/s and she is 2 m off of the ground? PE = mgh so = 600 kJ/(9.8m/s 2 x 500kg) = 122 m Drop of a Bullet

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