4) Effects of Force Flashcards
What is a force?
It is a push or a pull.
Other actions of forces includes lifting, pressing, stretching and twisting,
Guess the force:
A force which acts between two surfaces when they slide or try to slide against each other
Frictional force
Guess the force:
A force that causes an object to return to its original size or shape after we stop pulling or pushing it
Tension
Guess the force:
A force between magnetic poles.
magnetic force
Guess the force:
A force that pulls all objects towards the centre of the Earth
gravitational force
It is also known as weight.
What is the effect of force shown here?
A force can cause a change in the shape and/or size of an object.
It is important to note that the mass of the object** does not **change.
What is length?
Length is the distance between two points.
Name one of the three instruments used to measure length.
- ruler
- measuring tape (retractable)
- measuring tape (fabric)
What are the symbols of these units of length?
millimeter
centimeter
meter
kilometer
millimeter - mm
centimeter - cm
meter - m
kilometer - km
Convert 1 mm to m
1 mm = 0.001m
divide the number by 1000.
Convert 1 cm to m
1 cm = 0.01m
divide the number by 100.
Convert 1 km to m
1 km = 1000 m
multiply the number by 1000.
What is the meaning of ‘speed’?
The speed of an object is the distance travelled by the object per unit time.
E.g. A person moving 1 metre (m) per second (s) has a speed of 1 m/s.
A car moving 80 kilometres (km) per hour (h) has a speed of 80 km/h.
Think of the formula triangle.
What is the formula for speed?
When do we use average speed?
It is when objects that do not move at a constant speed, we can calculate the average speed by dividing the total distance travelled by the total time taken.
Think of the formula triangle.
What is the formula for average speed?
Note that the formula is the same as speed.
