A world of forces - understanding

11 important questions on A world of forces - understanding

What four effects can a force have on an object?

  1. The object changes shape and can even break.
  2. the object starts to move
  3. the object speeds up or slows down
  4. the direction of the object's motion changes ( for example, the object travels in a curve)

Which forces act at a distance?

magnetic force, electrical force and gravitational force

What is an electrical force?

The effect of electrical forces can be seen when you dry hair with a plastic comb. The comb attracts your hair.
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What is gravitational force?

The force due to gravity or gravitational force causes objects to fall downwards. Without gravity everything would drift through the air . The Sun's gravitational force keeps Earth in its orbit around the Sun.

What is adhesive strength?

Adhesive strength requires contact: object must touch each other. You are familiar with adhesive strength from adhesive tape and glue.

What is elastic force?

A spring that is under compression or extension exerts an opposing force which acts to restore the spring to its original form.

What is frictional force?

Frictional force is the opposing force produced when two objects are in contact. With a car travelling along a road there is friction between the tyres and the road surface. 

Elastic force and tension have the same cause. What is this cause??

the slight deformation (compression or extension) of a material

How can an jet engine generate propulsion?

In a jet engine exhaust gases are pushed out at high speed opposite to the direction of motion. The rocket pushes of against its own exhaust gases.

Describe how bird stays in the air?

The birds's wings push the air downwards and generate a supporting force upwards on the  body.

Describe how a rocket moves off in space.

A rocket moves off in space by pushing exhaust gases out from the motor with great force. The rock therefore pushes off against its own exhaust gases.

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