Forces 1
Skis are designed to have low friction.

Forces 1

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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.

1.
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
2.
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!
3.
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
4.
'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
5.
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
6.
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
7.
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
8.
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
9.
What forces are exerted by magnets?
Pushes
Pulls
Pushes and pulls
Neither pushes nor pulls
Magnets can attract (pull) and repel (push) objects
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

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