Year 7 - Unit 7K Forces (without 7Kb) quiz

What can forces do?

• make things start or stop moving
• change the shape of things
• make moving things change direction
• all of the above

Which answer shows three non-contact forces?

• magnetism, gravity, friction
• gravity, friction, upthrust
• gravity, static electricity, magnetism
• upthrust, static electricity, friction

What are the units used for measuring forces?

• metres
• newtons
• kilograms
• grams

Which is true?

• Your weight would be the same on the Earth and on the Moon.
• Your mass would be the same on the Earth and on the Moon.
• Your weight would be more on the Moon than on the Earth.
• Your mass would be less on the Moon than on the Earth.

Which of the following sentences about friction is not correct?

• Friction can make an object get hotter.

• Friction wears car tyres away.

• Friction slows down a ball rolling in grass.

• Friction can speed up a falling object.

Which of these would produce the most friction when they rub together?

• a rough surface and a smooth one
• two smooth surfaces
• two rough surfaces
• two smooth surfaces with oil between them

Which example shows unhelpful friction?

• friction between a tyre and the road
• friction in the wheel axles of a bicycle
• friction between paper and the point of a pencil
• friction between your shoes and the floor

Which of the following is not an example of a lubricant?

• grease for bicycle chains
• rubber on car tyres
• water on swimming pool tiles
• oil in a car engine

If the same force is acting on an area, which of these statements is true?

• The size of the area does not matter.
• The bigger the area, the bigger the pressure.
• The smaller the area, the smaller the pressure.
• The smaller the area, the bigger the pressure.

If all these birds are the same weight, which bird has the lowest pressure under its feet?

• A

• B

• C

• D