1) A 0.2 kg ball is dropped from a height of 5 m as shown in the diagram. What is its kinetic energy just before it hits the ground, assuming no air resistance? (Use g = 10 m/s2) a) 10 J b) 5 J c) 2.5 J d) 0 J 2) In a system with no friction, what is the relationship between gravitational potential energy and kinetic energy as an object falls? a) Potential energy increases, kinetic energy decreases b) Both increase c) Potential energy decreases, kinetic energy increases d) Both remain constant 3) A roller coaster car is at the top of a 20 m hill and then moves to a 5 m hill. If the car’s mass is 1000 kg, how much gravitational potential energy does it lose moving from the top of the 20 m hill to the 5 m hill? (Use g = 10 m/s2) a) 150,000 J b) 50,000 J c) 200,000 J d) 100,000 J 4) If an object’s velocity doubles, how does its kinetic energy change? a) It doubles b) It quadruples c) It halves d) It remains the same 5) A pendulum swings from point A (highest point) to point B (lowest point). At which point does the pendulum have maximum kinetic energy? a) Point A b) Point B c) Halfway between A and B d) Kinetic energy is constant 6) What happens to an object’s kinetic energy as it falls (assuming no air resistance)? a) It decreases b) It becomes zero c) It remains constant d) It increases 7) What happens to an object’s gravitational potential energy as it falls? a) It increases b) It decreases c) It remains constant d) It becomes zero immediately 8) A 3 kg object moves at 4 m/s. What is its kinetic energy? a) 24 b) 12 c) 48 d) 6 9) What is the formula for gravitational potential energy? a) EP = 1/2mv2  b) EP = mg/h  c) EP = mv  d) EP = mgh 10) A boy drove a toy car of mass 15Kg along a 5 m horizontal road at a speed of 2m/s. If the friction between the tires of the toy car and the ground was 0.2N, calculate the resultant kinetic energy of the car. a) 10 J b) 18J c) 29 J d) 45 J

Explain qualitatively and quantitatively the terms gravitational potential and kinetic energy.

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