EXPLAINING MOTION HOMEWORK (P4)

STEADY MOTION

P4 EXPLAINING MOTION HOME WORK

VIEW SLIDES 17-20 FOR SCIENCE

HOMEWORK

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FORCE AND MOMENTUM CHANGE

In a science lesson, four students discuss Air Bags as a safety feature in cars Mark: Air bag is a useful device, it stops the driver from hitting the steering wheel.Graham: They act as a cushion in the collision. Mustafa: They decrease the change in momentum occurring in the collisionKieran: They increase the time taken for the driver’s momentum to be lost. Which student gave the best scientific explanation of why Air Bags are important during a collision? Explain

your choice of answer.

Steady motion requires no resultant force

What forces are involved when something is moving at a steady speed? Use a labelled diagram to explain this in your science book


Steady motion requires no resultant force

What forces are involved when something is moving at a steady speed? Use a labelled

diagram to explain this in your science book

What is a Resultant Force


A car is travelling along a level road at a steady speed.

What forces are acting on the car?

A car is travelling along a level road at a steady speed.

We can think of the forces acting on the car as:

• a driving force caused by the engine

• a counter force caused by air resistance and friction.

D The driving force is smaller than the counter force.

B The driving force is a little bit bigger than the counter force.

A The driving force is a lot bigger than the counter force.

The car is travelling at a steady speed. Which of the following best describes the size of these two forces?

C The driving force is the same as the counter force.

D The resultant force is a small force backwards

B The resultant force is a small force forwards.

A The resultant force is quite a large force forwards.

C The resultant force is zero.

The car is travelling at a steady speed. Which of the following best describes the size of the resultant force?

Steady motionExplain your choice of answer.

GCSE JUNE 2008 A332/02 H-TIER PAPER

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Then Click on Explaining Motion Foundation/

Higher Tier

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YOUR HOMEWORK IS ON SLIDES

15, 16, 17, 18 and 19

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Check the following slides for Your Homework


HOMEWORKAnswer True or False to the Following sentences and

explain your choice of answer

1. The larger the mass and velocity the larger the momentum.2. Forces change momentum - the larger the force the more quickly the

momentum changes. 3. The size of the change in momentum depends on the size of the resultant

force and the time for which the force acts:4. In a moving car the passengers and the driver all have momentum.

Check Next Slide 16 and 17 for the concluding part of Your Homework

Copy And Complete the Following Sentences

1. If the driving force is greater than the counter forces, there is a resultant force ........... This will make the car .......... .........

2. If the driving force is less than the counter forces, there is a resultant force .......... This will make the car .............

3. If the ................. is the same as the counter forces, there is no resultant force, and so no change in ............ If the car is already moving, it will carry on at a ......... ........... in a straight line. If the car is not moving, it will ........ ............

4. Explain how seat belt can help to minimise the impact of the force acting on a passenger when a car crashes and comes to a sudden stop.

5. In one sentence, explain the importance of having seat belts or air bags in cars using your knowledge and understanding of forces and momentum.

6. A parachutist has a weight of 800 N. He is falling at a steady speed. What is the resultant force acting on him?

7. In the diagram below what is the size of the resultant force? (Please see next slide for diagrams)

Steady Speed, Backwards, Slow down, Speed up, Forwards, Driving Force, Velocity, Stay Still

15 N9N

26N16N

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Copy And Answer Questions

Q1. A 75 kg P.E teacher is running at 8 m/s because she is late for her lesson. What is her momentum?

Q2. In a science lesson investigating forces and motion, a force of 115 N acts on an object for 6 seconds. What is the momentum change of the object?


Remember the following:1. Show calculations + Formula

(explaining how you got your answers)2. Include units in your final answers.


EXPLAINING MOTION HOMEWORK (P4)

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