In a theme park ride, passengers in a car are initially at rest at the top of the track. The car then travels down and round a circular loop in the track.
What form of energy is possessed by the car and passengers at points X and Y?
KE is kinetic energy PE is gravitational potential energy
X: KE only; Y: PE only
X: PE only; Y: KE only
X: KE only; Y: KE and PE
X: PE only; Y: KE and PE
When a 300 N force is applied to a box weighing 600 N, the box moves 3.0 m horizontally in 20 s.
What is the average power?
45 W
90 W
900 W
1800 W
The diagram shows a small car of mass 500 kg approaching a hill. It moves up the hill with uniform speed.
Ignore friction and take the value of g to be 10 N/kg. How much work is done in moving the car up the hill?
5 x 103 J
5 x 104 J
1 x 105 J
1 x 106 J
Which method of energy release is affected by a change in the Earth's gravitational field?
Chemical
Geothermal
Hydroelectric
Nuclear
The diagram shows a curved track. A ball is released at point A.
At which point does the ball have the maximum gravitational potential energy?
A
B
C
D
In a hydroelectric power station, water from a reservoir falls down a large pipe before entering the turbines. The turbines then turn the generator. What is the overall energy conversion?
Kinetic energy into chemical energy
Kinetic energy into electrical energy
Potential energy into chemical energy
Potential energy into electrical energy
An experiment is carried out to measure the power of a student running up some stairs. Which of the followings is not required for this experiment?
The time taken to run up the stairs.
The total horizontal distance of the stairs.
The total vertical height of the stairs.
The weight of the student.
A man of weight 800 N carries a load of 200 N up some steps 2 m high.
What is the total work done?
400 J
1 600 J
2 000 J
20 000 J
A body moving with a speed of 30 m/s has a kinetic energy of 1 800 J.
What is its mass ?
2 kg
4 kg
60 kg
120 kg
Which device is designed to convert electrical energy to sound energy?
Generator
Loudspeaker
Microphone
Motor
A crane moved its load diagonally, as shown.
Which distance must the weight of the load be multipled by to find the increase in gravitational potential energy of the load?
A
B
C
D
Which quantity is not measured in joules (J) ?
Gravitational potential energy
Heat
Power
Work
Which quantity is calculated by multiplying the magnitude of the force by distance moved ?
Acceleration
Power
Pressure
Work
What are the energy changes in a battery-operated torch?
Chemical ->Electrical -> Light + Heat
Electrical -> Kinetic -> Light + Heat
Electrical -> Chemical -> Light + Heat
Kinetic ->Electrical -> Light + Heat
A ball, originally at point X, rolls down the hills shown in the diagram.
At which points does the ball have its maximum kinetic energy? ( Ingore friction )
A
B
C
D
Which type of energy depends upon the speed of a moving body?
Chemical
Geothermal
Kinetic
Nuclear
One of the following represents some of the main energy changes which take place in a coal-fired power station.
The sequence is .....................
heat ---> kinetic ---> electrical
heat ---> light ---> electrical
heat ---> chemical ---> electrical
kinetic ---> electrical ---> potential
A car coasts to a stop on a level road with its engine switched off.
The biggest energy change is, therefore, from ......................
chemical to kinetic
heat to chemical
heat to kinetic
kinetic to heat
What are the units for work and for power?
work
power
A
J
N
B
J
W
C
N
W
D
W
J
A
B
C
D
A weightlifter lifts different weights to different heights.