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Skis are designed to have low friction.

Forces 1

This Science quiz is called 'Forces 1' and it has been written by teachers to help you if you are studying the subject at middle school. Playing educational quizzes is a fabulous way to learn if you are in the 6th, 7th or 8th grade - aged 11 to 14.

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There are many types of force, such as thrust, magnetism and gravity. The famous scientist Galileo wanted to know whether gravity exerted the same force on all objects whatever their mass (the amount of matter an object contains). He dropped a cannonball and a small stone off the top of the tower of Pisa - and both hit the ground at the same time, showing that gravity always has the same force on all objects. Feathers only fall more slowly because of friction with the air. On the Moon a feather and a hammer fall at the same rate. Many people don't believe this until they try a similar experiment themselves.

Which of these would not be a result of applying force to a material?

The material is stretched

The material is compressed

The material is twisted

The material is changed into a new material

Forces can change the shape of a material, but not what it is!

What forces are exerted by magnets?

Pushes

Pulls

Pushes and pulls

Neither pushes nor pulls

Magnets can attract (pull) and repel (push) objects

What effect does air resistance have on a falling object?

It causes the falling object to speed up

It pushes the falling object sideways

It has no effect

It slows the falling object down

Parachutes work by maximizing air resistance

Why do trainers have rough-textured soles?

Rough-textured soles make trainers more 'slippery'

No one wants shoes which don't leave interesting footprints

Rough-textured soles help trainers to 'grip' surfaces better

People like to show off their shoe soles

Rough surfaces give much better 'grip' than smooth ones

If an object is stationary (not moving), what are the forces acting on it?

The forces are balanced

The forces are unbalanced

The forces are moving

The forces are unmoving

Balanced forces are equal forces acting in opposite directions

When a bowl is sitting on a table, which forces are said to be 'balanced'?

Gravity and air resistance

Upthrust and gravity

Friction and magnetism

Magnetism and air resistance

Without the 'upthrust' of the table, gravity would pull the bowl down (through the table)! When you look at a stationary object, such as the bowl, you can't see the balanced forces at work - but they are still there

'Compressing' a spring means which of these?

To push it inwards

To pull it outwards

To tie it into a knot

To send it down the stairs

Compressing is the opposite of stretching

Which of these objects is designed to have low friction?

Skis

Car tires

Bicycle brakes

Carpet

Brakes and tires are designed to have high friction, so as to slow the bike down and give it grip

Different Newtonmeters are used to measure different amounts of force. A Newtonmeter designed to measure large forces will have what type of spring?

A long, thin, very flexible spring

A thick spring that is very stiff

A short, but very flexible spring

No spring

A thick, stiff spring takes more force to stretch, allowing the Newtonmeter to measure greater forces. Newtonmeters designed for small forces will have thin, flexible springs

10.

What does friction cause?

Wind

Upthrust

Heat

Gravity

You can rub your hands together to warm them up. The friction causes heat

Author: Sheri Smith