1. What are the three fundamental forces outside of the nucleus?
What forces are acting in these pictures?

2. Force and Acceleration
06/07/2018
LO:
Derive from investigation the relationship between mass, force and acceleration
Be able to recall and use this confidently, including resolving forces

3. Newton’s Laws
First Law - A body will remain at rest or will continue with a constant velocity unless acted on by a resultant force
Second Law – When a resultant force acts on a body, it will accelerate (Speed up, slow down or change direction).
Third Law – For every action there is an equal and opposite reaction

4. W = mg YOUR TASKS a) Vary the force and measure the acceleration
b) Vary the mass and measure the acceleration
Carry out your practical and record your results (including repeats) in two correct tables
Two graphs (a vs F) & (a vs m) + calculate the gradient
Draw diagrams of your experimental set up & write a short conclusion for each

5. Conclusions:
a α F
a α 1/m
So:
F = ma

6. Force and acceleration
If the forces acting on an object are unbalanced then the object will accelerate, like these wrestlers!
Force = Mass x Acceleration

7. F = ma
1 Newton is force required to accelerate a ...

8. Force and acceleration are always in the same direction
Always use the resultant force

9. Force, mass and acceleration
A car accelerates at a rate of 5m/s2. If it has a mass of 500kg how much driving force is the engine applying?
A force of 1000N is applied to push a mass of 500kg. How quickly does it accelerate?
A force of 3kN acts on a car to make it accelerate by 1.5m/s2. What is the mass of the car?

10. Sally is driving her new car. The mass of the car is 1200 kg.
If she is travelling at a constant speed, what can you say about the forces acting on the car?
What does Sally do when she wants to increase the speed of the car?
Sally increases her speed from 10 m/s to 20 m/s in 5 seconds. What is her acceleration?
What extra force is needed to produce this acceleration?

11. A railway engine pulls a wagon of mass 10 tonnes along a level track at a constant velocity. The pull force in the couplings between the engine and wagon is 1000 N.
(A) What is the force opposing the motion of the wagon?
(B) If the pull force is increased to 1400 N and the resistance to movement of the wagon remains constant, what would be the acceleration of the wagon?

12. Qu 6 on previous ‘Vectors and Statics’ worksheet
A gardener pulls a 50kg roller along level ground. The roller moves at a steady speed when the handle makes an angle of 30o to the horizontal ground. The gardener pulls with a force of 300N.
Calculate the horizontal component of the force
What is the net horizontal force? What therefore is the resistive force?
Determine the vertical contact force.

13. For practice:
Worksheet ‘TAP 211-2: Newton’s Second Law’
Qu1-2 Pg31

14. Describe the motion of this car. What is the name of the missing force
Describe the motion of this car. What is the name of the missing force? What value would it have?
1500N
1500N
9800N