NAME: ________________
Example
What is the kinetic energy of a 100kg object that is travelling at 20m/s?
Ek=? m=100kg v=20m/s
Ek= ½mv2
(½m) (v2)
Ek=(½ x 100) x (202)
Ek=50 x 400
Ek= 20,000 J
Using the example as a guide, complete the following questions. The first two
have been partly completed and colour coded for you! Remember, when a
number is squared it is multiplied by itself! E.g. 102 = 10 x 10 = 100
1. Ek=? m=20kg v=20m/s
3. Ek=? m=4000kg v=31m/s
Ek= ½mv2
Ek= ½mv2
(½m) (v2)
(½m) (v2)
Ek=(½ x 20) x (202)
Ek=(½ x ______) x (_____2)
Ek=_____ x _____
Ek=________________
Ek= _________ J
[2 marks] Ek= _______________ [3 marks]
2. Ek=? m=4kg v=15m/s
4. Ek=? m=250kg v=2m/s
Ek= _________________
Ek= _________________
Ek= _________________
Ek= _________________
Ek= _________________
Ek= _________________
Ek= _________________[4 marks] Ek= _________________[4 marks]
NAME: ________________
LEVEL 2 (REMEMBER, Kinetic energy calculations are done using kilograms! )
1. Ek=? m=500g v=40m/s
3. Ek=? m=3.8g v=15m/s
Ek= _________________
Ek= _________________
Ek= _________________
Ek= _________________
Ek= _________________
Ek= _________________
Ek= _________________[4 marks] Ek= _________________[4 marks]
2. Ek=? m=50g v=100m/s
4. Ek=? m=2.7g v=31m/s
Ek= _________________
Ek= _________________
Ek= _________________
Ek= _________________
Ek= _________________
Ek= _________________
Ek= _________________[4 marks] Ek= _________________[4 marks]
LEVEL 3
1. What is the kinetic energy of a ball
3. Bob is running at 2m/s and has a mass of
that is travelling at 4m/s and is 4kg?
10kg. What’s his kinetic energy?
Ek= _________________
Ek= _________________
Ek= _________________
Ek= _________________
Ek= _________________
Ek= _________________
Ek= _________________[4 marks]
Ek= _________________[4 marks]
2. Calculate kinetic energy if a mass is
travelling at 10m/s and is 400kg
Ek= _________________
Ek= _________________
Ek= _________________
Ek= _________________[4 marks]
4. Jane is 4.5kg. She can run at 5m/s.
What is her kinetic energy?
Ek= _________________
Ek= _________________
Ek= _________________
Ek= _________________[4 marks]