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Law of Acceleration
Prepared by: Jeve F. Gonzales
Isaac Newton
Objectives:
define and identify the units for
acceleration, mass, and force
State the Law of Acceleration
Solve problems on law of
acceleration
Getting started
 First, you need to define and know the units
of mass, force and acceleration:
 Force is a push or a pull
 The unit that used to measure Force is
Newton (N)
 Gravity is the force of attraction that exists
between two objects that have mass
 The force of gravity depends on the mass of
the object and the distance between them.
The force of the gravity causes all objects
near Earth’s surface to fall with an
acceleration of 9.8 m/s².
Your weight on Earth is the gravitational
force between you and Earth.
How are weight and mass different?
Weight is a force and is measured in
newtons
Mass is the amount of matter in an object
and does not depend on location
- it is measured in kg
Weight will vary in location but mass will
remain constant.
F = W = mg
Acceleration
Is a change in velocity
 Speeding up
- positive acceleration
 Slowing down
- negative acceleration
- deceleration
 Changing direction
 Unbalanced forces cause objects to accelerate
But there is a twist
Acceleration is inversely related
to the mass of the object
a ∝ F a ∝ 1/𝑚 a = F/m
1.
Given:
m = 1 000 kg
a = 0.05 m/s²
F = ?
Solution:
F= ma
F = 1 000 kg x 0.05 m/s²
F= 50 kg.m/s² or 50 N
Problem Number 2
A golf ball has a mass of
approximately 0.046 kg.
How much force must be
applied by the tee so
that the ball will move
from rest to 8.25 m/s in
10.0 seconds?
Given:
m = 0.046 kg F = ?
t = 10 sec.
Vi = 0
Vf = 8.25 m/s
Solving for acceleration,
a = vf-vi
t
a = 8.25 m/s – 0
10 sec
F = ma
F = 0.046 kg x 0.825 m/s²
a = 0.825 m/s²
F = 0.038 N
Problem no. 3
Suppose a bus
weighs 1,200N and
slows down in a
distance of 55m from
50m/s. How much
force is exerted to
the brakes?
Given:
w = 1,200 N F =?
d = 55 m
Vf = 0
Vi = 50 m/s
Solution:
a = vf²-Vi²
2d
a =(0)² – (50 m/s)²
2 (55 m )
a = - 2 500 m²/s²
110 m
m = w/g
m = 1, 200 kg.m/s²
-9.8 m/s²
F = ma
F = (- 122.45 kg) ( - 22.73
m/s²)
a = - 22.73 m/s²
m = - 122.45 kg
F = 2, 783.29 N
Supply the following with the
correct answer:
Net Force
(N)
Mass
(kg)
Acceleration
( m/s²)
10 2 5
20 2 10
20 5
10 5
1 10
Net Force N) Mass
(kg)
Acceleration
( m/s²)
10 2 5
20 2 10
20 4 5
10 5 2
10 1 10
If mass remains constant, doubling the acceleration,
doubles the force. If force remains constant, doubling
the mass, halves the acceleration.
Thank you!

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Law of Acceleration.pptx

  • 1. Law of Acceleration Prepared by: Jeve F. Gonzales Isaac Newton
  • 2. Objectives: define and identify the units for acceleration, mass, and force State the Law of Acceleration Solve problems on law of acceleration
  • 3. Getting started  First, you need to define and know the units of mass, force and acceleration:  Force is a push or a pull  The unit that used to measure Force is Newton (N)  Gravity is the force of attraction that exists between two objects that have mass  The force of gravity depends on the mass of the object and the distance between them.
  • 4. The force of the gravity causes all objects near Earth’s surface to fall with an acceleration of 9.8 m/s². Your weight on Earth is the gravitational force between you and Earth.
  • 5. How are weight and mass different? Weight is a force and is measured in newtons Mass is the amount of matter in an object and does not depend on location - it is measured in kg Weight will vary in location but mass will remain constant. F = W = mg
  • 6. Acceleration Is a change in velocity  Speeding up - positive acceleration  Slowing down - negative acceleration - deceleration  Changing direction  Unbalanced forces cause objects to accelerate
  • 7.
  • 8.
  • 9.
  • 10. But there is a twist Acceleration is inversely related to the mass of the object
  • 11.
  • 12. a ∝ F a ∝ 1/𝑚 a = F/m
  • 13. 1.
  • 14. Given: m = 1 000 kg a = 0.05 m/s² F = ? Solution: F= ma F = 1 000 kg x 0.05 m/s² F= 50 kg.m/s² or 50 N
  • 15. Problem Number 2 A golf ball has a mass of approximately 0.046 kg. How much force must be applied by the tee so that the ball will move from rest to 8.25 m/s in 10.0 seconds?
  • 16. Given: m = 0.046 kg F = ? t = 10 sec. Vi = 0 Vf = 8.25 m/s Solving for acceleration, a = vf-vi t a = 8.25 m/s – 0 10 sec F = ma F = 0.046 kg x 0.825 m/s² a = 0.825 m/s² F = 0.038 N
  • 17. Problem no. 3 Suppose a bus weighs 1,200N and slows down in a distance of 55m from 50m/s. How much force is exerted to the brakes?
  • 18. Given: w = 1,200 N F =? d = 55 m Vf = 0 Vi = 50 m/s Solution: a = vf²-Vi² 2d a =(0)² – (50 m/s)² 2 (55 m ) a = - 2 500 m²/s² 110 m m = w/g m = 1, 200 kg.m/s² -9.8 m/s² F = ma F = (- 122.45 kg) ( - 22.73 m/s²) a = - 22.73 m/s² m = - 122.45 kg F = 2, 783.29 N
  • 19. Supply the following with the correct answer: Net Force (N) Mass (kg) Acceleration ( m/s²) 10 2 5 20 2 10 20 5 10 5 1 10
  • 20. Net Force N) Mass (kg) Acceleration ( m/s²) 10 2 5 20 2 10 20 4 5 10 5 2 10 1 10 If mass remains constant, doubling the acceleration, doubles the force. If force remains constant, doubling the mass, halves the acceleration.