What is the name of the energy store associated with a moving object?
Elastic
Kinetic
Gravitational
Which of these is an elastic store?
A stretched catapult
A catapult stored in a cupboard
A candle
What is the main energy transfer for an apple falling from a tree?
Kinetic store → elastic store
Chemical energy → gravitational store
Gravitational store → kinetic store
What is the main energy transfer for a long distance runner?
Kinetic store → chemical energy
Chemical energy → kinetic store
Which of these cannot happen to energy?
Energy cannot be stored
Energy cannot be dissipated
Energy cannot be created
If conservation of energy applies, which of the following statements is true?
Energy transferred is equal to work done
Energy transferred is equal to the kinetic store
Energy transferred is equal to the energy from the Sun
How much potential energy is gained by a 3 kg object raised by 5 m? (g = 10 N/kg)
3 × 5 × 10 = 150 J
32 × 5 × 10 = 450 J
3 × 5 ÷ 10 = 1.5 J
How much energy is transferred in stretching when a spring is extended by 10 cm? (Spring constant for this spring = 2,000 N/m)
0.5 × 2,000 × 102 = 100,000 J
0.5 × 2,000 × 0.102 = 10 J
0.5 × 2,000 × 0.012 = 0.1 J
Which of these is the correct equation for kinetic energy?
Kinetic energy = 0.5 × mass × speed
Kinetic energy = 2 × mass × (speed)2
Kinetic energy = 0.5 × mass × (speed)2
Which situation involves the transfer of the most potential energy?
A 1 kg ball raised from 2 m to 4 m
A 1 kg ball lowered from 4 m to 2 m
A 2 kg ball raised from 2 m to 4 m