kinetic energy Flashcards
1
Q
what is kinetic energy
A
the energy stored in moving objects
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)
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
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
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