5-4-Slide-Show-Force-Mass-and-Acceleration.pptx

Students will be able to:
Describe the effect of a change in the force applied to an object’s acceleration.
Describe the effect of a change in mass on an object’s acceleration
Use the formula F = ma

Key Vocabulary:
Acceleration, Force, Kinetic energy, Mass, Newton, Newton’s Second Law
Newton’s Second Law – Force, Mass, and Acceleration
When a force is applied to a mass, it will accelerate in the direction that the force pushes or pulls it.
Newton’s second law describes the relationship between the mass of an object, the force exerted on it and its acceleration as a result.

If the net force acting on an object increases, then acceleration will also increase.
For example, a motorbike can produce much more thrust force than a scooter, so it will have a greater acceleration.
As the size of the force increases, the acceleration of the mass will also increase, i.e. if the force applied to the object doubles, the acceleration of this object will also double.

1. Force, Mass, and Acceleration Unit 7 Lesson 5

2. Force, Mass, and Acceleration Students will be able to: Describe the effect of a change in the force applied to an object’s acceleration. Describe the effect of a change in mass on an object’s acceleration Use the formula F = ma Key Vocabulary: Acceleration, Force, Kinetic energy, Mass, Newton, Newton’s Second Law

3. Force, Mass, and Acceleration Newton’s Second Law – Force, Mass, and Acceleration When a force is applied to a mass, it will accelerate in the direction that the force pushes or pulls it. Newton’s second law describes the relationship between the mass of an object, the force exerted on it and its acceleration as a result.

4. Force, Mass, and Acceleration Newton’s second law describes the mass of an object, the force exerted on it and its acceleration as a result or F = ma.

5. Force, Mass, and Acceleration If the net force acting on an object increases, then acceleration will also increase. For example, a motorbike can produce much more thrust force than a scooter, so it will have a greater acceleration. As the size of the force increases , the acceleration of the mass will also increase , i.e. if the force applied to the object doubles , the acceleration of this object will also double .

6. Force, Mass, and Acceleration As the size of the force increases , the acceleration of the mass will also increase , i.e. if the force applied to the object doubles , the acceleration of this object will also double .

7. Force, Mass, and Acceleration However, force and acceleration are only two parts to the equation. Mass also plays an important role in this situation. For example, if a car and a bus were accelerating at the same rate, the bus would have a greater force than the car due to its larger mass.

8. Force, Mass, and Acceleration If the force stays the same (remains constant), and the mass is increased, the acceleration will decrease. i.e. with a constant force and double the mass, the acceleration will halve.

9. Force, Mass, and Acceleration The relationship between force mass and acceleration can be represented in the following equation: force = mass x acceleration f = ma F a m Force (F) is measured in Newtons (N) Mass (m) is measured in kilograms (kg) Acceleration (a) is measured in meters per second per second ms -2

10. Force, Mass, and Acceleration Force, mass and acceleration: To calculate force: F = ma mass: m = F/a acceleration: a = F/m F a m Force (F) is measured in Newtons (N) Mass (m) is measured in kilograms (kg) Acceleration (a) is measured in meters per second per second ms -2

11. Force, Mass, and Acceleration Using F=ma Example 1: An object has a mass of 1.25 kg and an acceleration of 0.8 ms -2 . Calculate the force needed to move it. F = m x a F = 1.25 x 0.8 F = 1 Newton or 1 N.

12. Force, Mass, and Acceleration Using F=ma Example 2: A force of 20N is applied to an ice hockey puck which has a mass of 0.5kg. What is the puck’s acceleration? a = F/m a = 20 / 0.5 a = 40 ms -2