KE GPE

A car travelling along a straight road has kinetic energy of 180 kJ. The brakes are applied, and it is brought to rest over a distance of 60 m. What is the average force of the car breaks?

• 3000 N

• 10800 N

• 3 N

A car of mass 1500 kg, travelling at a steady speed, has a kinetic energy of 200 kJ. What is the speed of the car?

• 0.52 M/S

• 16.3 M/S

• 266.7 M/S

What is the gravitational potential energy stored in a 60 kg boy sitting at the top of a 2 m high slide?

• 1365 J

• 1697 J

• 1178 J

What is the unit of gravitational potential energy?

• N

• J

• N/kg

A mass of 40 kg and a mass of 80 kg are dropped from rest, from the same height. If air resistance is ignored, which would hit the ground first?

• The 40 kg mass

• The 80 kg mass

• Both at the same time

Which of the following has kinetic energy?

• A book on a bookshelf

• a girl sprinting

• a streched spring

Which of the following has gravitational potential energy?

• A book on a shelf

• A girl sprinting

• a stretched spring

What is the main energy transfer for a long-distance runner?

• Kinetic energy → chemical energy

• Chemical energy → gravitational potential energy

• Chemical energy → kinetic energy

What is the main energy transfer for an apple falling from a tree?

• Kinetic energy → elastic potential energy

• Chemical energy → gravitational potential energy

• Gravitational potential energy → kinetic energy

Which of these cannot happen to energy?

• Energy cannot be stored

• Energy cannot be dissipated

• Energy cannot be created