Paper 1 forces and energy

A clockwork car moving along a level surface will involve which energy change?

• elastic to kinetic

• electrical to kinetic

• kinetic to electrical

• kinetic to elastic

A block has a mass of 15 kg. Its weight on the Earth is…

• 150 N

• 25 N

• 5 N

• 1.5 N

The mass of an object is measured in

• Grams

• Kilograms

• Stone

• Newtons

A car engine converts 1600 J of chemical energy into 400 J of kinetic energy. What is the efficiency?

• 4.0

• 0.75

• 0.25

• 0.25%

What is the type of force between sandpaper and the piece of wood it is moved across?

• Friction

• Drag

• Contact

• Surface Tension

A block has 50N pushing to the left and 40 N pulling to the right the resultant force is…

• 90 N left

• 10 N left

• 10 N right

• 90 N right

Which is the odd one out.

• electrical

• sound

• mechanical

• gravitational energy

Which of the following could only affect a moving object?

• Friction

• Weight

• Drag

• Contact

Which of the following is a false statement about gravity?

• Gravity causes the planets to orbit the Sun.

• Gravity causes object to fall towards the Earth’s surface.

• Gravity causes the solar system to be part of the Milky Way

• Gravity causes satellites to receive signals from Earth.

A loudspeaker produces 2J of heat, 1 J of electromagnetic power and 42 J of sound. What is the input electrical power transfer?

• 93%

• 3 W

• 3 J

• 45 J