forces and motion

Question 1

when several forces act on a body, the resultant (overall) force on the body can be found by ——

Answer 1

adding together forces which act in the same direction and subtracting forces which act opposite in directions .

Question 2

define friction.

Answer 2

a force that opposes the motion of an object. it always acts in the opposite direction in which the object is moving.

Question 3

define resultant force

Answer 3

unbalanced/net/overall force.

Question 4

what happens when an unbalanced (resultant) force acts on an object?

Answer 4

the object will accelerate.

Question 5

state the equation linking force mass and acceleration

Answer 5

force = mass x acceleration.

Question 6

the greater the force, the greater the acceleration (for a given mass).

Answer 6

the greater the force, the greater the acceleration (for a given mass).

Question 7

for a given force, the smaller the mass the greater the acceleration.

Answer 7

for a given force, the smaller the mass the greater the acceleration.

Question 8

define mass and state its units.

Answer 8

mass is the amount of matter in an object (unchanged) mass is measured in kgs.

Question 9

define weight and state its units

Answer 9

weight is the force of gravity on a mass.

Question 10

what does the size of weight depend on?

Answer 10

the gravitational field strength.

Question 11

state the equation linking weight, mass and gravitational field strength

Answer 11

weight = mass x gravitational field strength

Question 12

what is the value of gravitational field strength on earth?

Answer 12

10N/kg