1c forces, movement, shape and momentum

Question 1

what can forces act on

Answer 1

can act on a body to change the velocity, so the speed, direction or both.

Question 2

gravitational force

Answer 2

The force that the earth pulls the body to its centre

Question 3

weight force

Answer 3

Weight is the force on the object due to gravity

Question 4

friction force

Answer 4

opposing forces acting in a direction that is opposite to the direction of the applied force or to the direction of motion

Question 5

air resistance

Answer 5

a resistive force that acts against objects that are moving through the air

Question 6

tension

Answer 6

forces that stretch an object

Question 7

upthrust

Answer 7

An object that is partly, or completely, submerged experiences a greater pressure on its bottom surface than on its top surface

Question 8

vector

Answer 8

direction and magnitude

Question 9

scalar

Answer 9

only magnitude no direction

Question 10

what is the relationship between force, mass and acceleration

Answer 10

force=mass x acceleration

Question 11

what is the relationship between weight, mass and gravitational field strength

Answer 11

w=m x g

Question 12

describe the forces acting on falling objects

Answer 12

The increase in speed leads to an increase in the amount of air resistance. Eventually, the force of air resistance becomes large enough to balances the force of gravity. At this instant in time, the net force is 0 Newton; the object will stop accelerating. The object is said to have reached a terminal velocity.

Question 13

hookes law

Answer 13

The extension of a spring is directly proportional to the force applied, provided that the limit of proportionality is not exceeded.