Sec 2 Science Forces & Energy topical questions

Classify each force as contact or non-contact.

1. (a)Friction[1]
2. (b)Gravity[1]
3. (c)The push of a magnet on an iron nail it is not touching[1]

State the unit of force and the unit of energy.

A force of 20 N acts on an area of 4 cm². Calculate the pressure.

State one difference between mass and weight.

Name two effects a force can have on an object.

A student weighs 450 N on Earth. Her mass is 45 kg.

1. (a)State what the 450 N measures.[1]
2. (b)State what the 45 kg measures.[1]
3. (c)State what would happen to each quantity on the Moon, where gravity is weaker.[2]

Explain why a wide snowshoe stops you sinking, using pressure.

A lamp is switched on. Describe the energy conversion, and explain why it is wrong to say the electrical energy disappears.

A spanner is used to turn a nut. Name the effect of the force, and state whether the force is contact or non-contact.

Give one benefit and one environmental cost of generating electricity from fossil fuels.

Two shoes press on the floor with the same force of 400 N. Shoe A touches 40 cm². Shoe B touches 10 cm².

1. (a)Calculate both pressures.[2]
2. (b)Which shoe is more likely to mark a soft floor? Explain.[2]

A ball rolls and stops. A student says friction destroyed the kinetic energy. Evaluate the statement.

Explain how drinking through a straw uses atmospheric pressure, and why this is a force even though you cannot see the air.

A country plans to replace some fossil-fuel electricity with wind turbines. Give one energy-conservation idea that still applies, and one environmental trade-off.

A suitcase has a mass of 8 kg. Calculate its weight on Earth, taking 1 kg to weigh about 10 N. Then explain why a balance that shows “8.0” may be labelled in kilograms even though weight is what gravity produces.