Netforce
Calculate the Net force of the object with 5N force to the right and 5N force to the left.
5N to the right - 5N to the left (opposite vectors)
= 0N (cancel out)
What is the density of water?
1 g/cm3
What is the equation to determine force (Newton's 2nd law)
F = m x a
What unit is torque measured in?
Nm - Newton Metres
What is acceleration on Earth?
9.81 m/s2
Calculate the Net force on an object with a force of 20N South and a force of 30N North.
Net force = 30N - 20N
= 10N North
An object with density of 0.75 g/cm3 is placed in fresh water.
Will it sink of float?
Float as the object's density is 0.75 g/cm3 < 1g/cm3
What is the unit we measure acceleration in?
m/s2
What is distance measured in when calculating torque
what unit is weight measured in?
Newtons (N)
What is the Net force of a ball with 50N north, 50N south, 30N east and 20N west.
Calculate the net force
50N North and 50N south cancel each other out
net force = 30N east - 20N west
= 10N east
An object with density of 5.3 g/cm3 is placed in fresh water
Will it sink or float?
Sink because the object's density > 1 g/cm3
A student pushes a box with an acceleration of 2 m/s2. If the box has a mass of 20kg, what is the force applied by the student on the box?
F = m x a
f = 20 x 2
f = 40N
draw a diagram that represents torque:
must have the following labelled:
- pivot point
- distance
- applied force
- torque (rotational force)
teacher must approve the diagram
Calculate the weight (N) of an object on earth (9.81m/s2) with mass of 5kg.
weight (N) = mass x acceleration
w = 5kg x 9.81 m/s2
w = 49.05N
Calculate the acceleration of an 5kg object that has a force of 10N left and 40N right.
- work out the net force force and then the acceleration using a = f/m
Net force = 40N - 10N
A = F/m
A = 30N / 5kg
A = 6 m/s2
Calculate the density of an object that has a mass of 10g and a volume of 20 cm3
p (desnity) = mass / volume
p (density) = 10g / 20
p (density) = 0.5 g/cm3
determine the acceleration of an object with force of 30N and a mass of 3kg
use formula --> f = m x a
But you will have to rearrange it (use the triangle)
f = m x a
*rearrange the equation*
a = f/m
a = 30N / 3kg
a = 10 m/s2
Calculate the torque produced by an object that has perpendicular force of 20N applied at a distance of 4m
*hint: t = f x d
Torque = Force x distance
t = 20N x 4m
t= 80Nm
If an object has a mass of 5 kgs, calculate its weight on Mars given that the gravitational acceleration is 3.71m/s2.
Weight (N) = mass (kg) x acceleration
Weight (N) = 5 kg x 3.71m/s2
weight (N) = 18.55 N
A toy car is being pushed along a flat surface by two different people. One person pushes the car to the right with a force of 10 N, and the other person pushes the car to the left with a force of 6 N. The car also experiences a frictional force of 2 N acting to the left. What is the net force acting on the car, and in which direction does the car move?
Total force to the right=10N
Total force to the left= 6N+2N = 8N
Net force = 10N - 8N
= 2N to the right
A block of wood has a mass of 200 grams and a density of 4 g/cm3. What is the volume of the block of wood?
volume = mass/density
volume = 200/4
volume = 50cm3
You are playing with a toy rocket that can produce a force of 10 N when it launches. When you launch the rocket, it accelerates upward at a rate of 5 m/s².
calculate the mass of the object using newtons second law
f = m x a
rearrange eqaution
mass = force/acceleration
mass = 10N / 5m/s2
mass = 2kg
A mechanic applies a force of 30 newtons to the wrench, which causes a torque of 90 newton-meters on the bolt. How far from the bolt is the mechanic applying the force? (calculate the distance)
torque = force x distance
Rearrange the equation:
d = torque/force
d = 90/30
d = 3m
You have a suitcase with a mass of 12 kg. calculate the weight of the suitcase on Earth.
You take the suitcase to a planet X where the acceleration due to gravity is 8 m/s².
what is the difference in suitcase weight between the planets
= 117.7 N
weight on planet X = 12 x 8
= 96N
difference in weight = 117.7 - 96
= 21.7 N