kinetic energy Flashcards

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1
Q

what is kinetic energy

A

the energy stored in moving objects

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2
Q

what is the equation for kinetic energy

A
Ek = 0.5 x m x V^2
Ek= kinetic energy(J)
m= mass(kg)
V= speed(m/s)
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3
Q

a car with a mass of 700kg is moving with a speed of 20 m/a. Calculate the kinetic energy of the car

A

140 000J
Ek= 0.5 x m x V^2
Ek= 0.5 x 700 x 20^2
Ek= 140 000J

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4
Q

A cyclist and bike have a total mass of 100 kg and a speed of 15 M/S calculate the kinetic energy

A

11250J
Ek= 0.5 x m x V^2
Ek= 0.5 x 100 x 15^2
Ek= 11 250J

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5
Q

A tennis ball is travelling at 50 m/a amd has a kinetic energy of 75J. Calculate the mass of the tennis ball

A
0.06kg
Ek = 0.5 x m x V^2
M = Ek / 0.5 x V^2
M = 75/ 0.5 x 50^2
M = 0.06kg
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