S1 - Section 5 - Forces

To help you fill in the blanks you can use the following words:

balanced, dense, friction, load, lubricate, machine, magnetism, newtons,
pull, speed, streamlined, unbalanced, upthrust, weight.

Make sure that you spell them correctly.

If the answer is a number you will have to calculate it for yourself.

1.
	A force can be a push, or twist.

2.
	Forces are measured in units called by using a spring-balance.

3.
	The reading on this spring-balance is N.

4.	The force of gravity pulling you down towards the Earth is called your .

5.	Forces can change three things about an object: its shape, and direction.

6.
	is a force between two surfaces that tries to stop one moving over the other.

7.	To reduce friction we can the surfaces with oil or grease.

8.	Some forces can act without touching. For example: gravity, electricity and .

9.	Dolphins are to reduce drag and help them move more quickly through the water.

10.
	The force that keeps a boat afloat is called .

11.
	When two forces are equal in size but are pulling in opposite directions they are called forces.

12.	A boat will float higher in sea-water than fresh-water because sea-water is more .

13.
	A lever is a simple .

14.	Using a lever a small effort can be used to lift a heavy .

15.
	The resultant force on the toy car is N.

16.	An force will make an object accelerate or decelerate.