PE/KE/EPE

What is the KE of a football which has a mass of 0.8 kg and is kicked at a velocity of 10m/s?

• 80 J

• 3.2 J

• 160 J

• 40 J

What is the kinetic energy of a zorb and human with a total mass of 90Kg rolling at 10m/s?

• 3,700J

• 900J

• 4,500J

• 6,500J

Roger Federer’s tennis ball has a mass of 0.3 kg. If he holds the ball above the ground at a height of 2.0 m to serve, what is its gravitational potential energy (GPE)?

• 5.88 J
• 0.6 J
• 6.67 J
• 0.15 J

A leopard with a mass of 55.00 kg climbs 12.0 m up a tree. What is its GPE?

• 6,468 J
• 660 J
• 4.58 J
• 0.22 J

Gravitational potential energy depends on the ________ and ________ of the object. 

• Height and mass
• Friction and movement
• Mass and Movement
• Height and kinetic energy 

A skateboarder travels from location 1 to location 4 as shown.  At which location does the skateboarder have the most kinetic energy and the least potential energy?

• 1
• 2
• 3
• 4

The sum of the kinetic and potential energy in a system is known as the system's _____________________ energy.

• mechanical

• chemical

• thermal

• combined

A cliff diver with a mass of 125 kg jumps off a high cliff, at a height of 10m he is moving at 15.5 m/s. What is his MECHANICAL energy.

(HINT: ME = KE + PE)

g = 9.8 m/s²

• 15,015.6 J

• 12,250 J

• 27,265.6

• 2,765.6

Calculate the force that changes the spring length by 0.25m, when the spring's spring constant is 350Nm^-1.

• 1400 N

• 14000 N

• 7.14 x 10^-4 N

• 87.5 N

A force of 157 N acts on a spring with a spring constant of 350 Nm^-1. Calculate the length the spring changed.

• 540 m

• 45 m

• 54950 m

• 0.45 m