forces Flashcards
study (35 cards)
What does frictional force do?
Frictional force helps to slow down or stop a moving object.
How does frictional force assist with holding objects?
It helps us to hold objects without dropping them.
What prevents slipping while walking?
Frictional force between the soles of our shoes and the ground prevents us from slipping and falling.
What happens when we rub our hands together?
When we rub our hands together, there is friction between our palms.
What occurs when a matchstick is struck against a matchbox?
The frictional force between the matchstick and matchbox causes the matchstick to light up.
How can frictional force start a fire?
Frictional force from the rubbing of sticks together can start a fire.
What effect does frictional force have on moving objects?
Since frictional force opposes motion, it can cause moving objects to slow down.
What does frictional force cause objects to do?
It also causes objects to wear out more easily.
What does frictional force produce in machine parts?
Frictional force between the moving parts of the machine produces heat.
What can worn-out tyres lead to?
Worn-out tyres can cause road accidents.
How can we reduce frictional force?
We can use lubricants such as oil, grease or water to reduce the frictional force between two surfaces.
What other methods can reduce frictional force?
Bearings and rollers can also be used to reduce the frictional force between moving parts.
What defines a material as elastic?
A material is elastic if it is able to return to its original shape after a force applied on it is removed.
What happens when we pull a spring?
When we pull a spring and then let go of it, it returns to its original shape.
What occurs when a spring is pulled or pushed?
When we pull or push a spring, it gets stretched or compressed.
What is elastic spring force?
Elastic spring force is exerted by a spring when the spring is stretched or compressed.
What happens to elastic spring force with more stretching?
Greater elastic spring force is exerted by the spring that is stretched or compressed more.
What is gravitational force?
Gravitational force is the force of attraction between objects.
How does gravitational force act?
It can act from a distance.
What does gravitational force pull objects towards?
It pulls all objects towards the centre of the Earth.
What does gravitational force prevent?
This prevents us from floating in the air.
What does gravitational force cause objects to do?
It causes objects to fall downwards.
Why is it harder to climb up a hill?
It is harder to climb up a hill as the movement is in the opposite direction of gravitational force.
Why is it easier to go down a slope?
It is easier to go down a slope as the movement is in the same direction as gravitational force.
