Forces Flashcards
(25 cards)
A moon buggy has a weight of 800KG. What will its weight in deep space be?
0 N
In which direction is the net force of a braking car heading west?
East
If a stationary astronaut in space is pushed for a short instant by a small force what will happen?
She will continue to move in a straight line unless acted upon by another force
What is an example of a force that changes the direction but not the speed of an object?
A planet in orbit around the sun attracted by the force of gravity
What can a force be described as?
A push or pull
What is a situation which only involves pull forces?
A rock falling to the moon
What is the difference between an attractive and repulsive force?
An attractive force is a push, whereas a repulsive force is a pull
What can a force do?
Change the speed of an object, get an object to move, stop a moving object and change the direction of a moving object
What are the three types of forces?
Gravitational, electric and magnetic
What is an example of a gravitational force?
The moon attracted to the Earth
What is an example of an electric force?
A charged comb lifting a person’s hair
What is an example of a magnetic force?
A magnet pulling a ball-bearing along a table
What is the unit of force?
The Newton (N), named after Isaac Newton
What is one newton the force of?
100 grams
To convert mass to force, what must you do?
Multiply the mass by 10
What is weight?
The force of gravity acting on an object
What is mass?
The amount of matter in an object
How do you calculate the weight of someone on the moon?
Divide their weight by 6, then multiply by 10
What does a spring balance measure?
Weight
What does a triple arm balance measure?
Mass
What happens to an object with a net force acting on it?
It will experience a change in motion
What are the two most important aspects of forces?
Size and direction of force
What is Newton’s third law of motion?
If Object A exerts a force on Object B, then Object B exerts an equal-sized force on Object A in the opposite direction
During Newton’s third law of motion, describe the pairs of forces?
These pairs of forces are equal in size, opposite in direction and act on different objects
