Calculate the speed taken. |
1. 200 kilometres per 4 hours | Answer: |
2. 80 kilometres per 2 hours | Answer: |
3. 200 kilometres per 40 minutes | Answer: |
4. 500 kilometres per 30 minutes | Answer: |
5. 90 kilometres per 2 hours | Answer: |
Unit 3 Worksheet B
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Unit 3 Worksheet A
Rearrange the vehicles below accordingly.
Distance travelled by the vehicle from the furthest to the nearest.
1. | 2. | 3. | 4. | 5. |
Speed
Click the picture, what are you see ?
The speed of a moving object can be calculated if the distance travelled by the object and the time taken to travel the distance is known.
Units of speed: centimeters per second (cm/s), meters per second (m/s), kilometers per hour (km/h)
Examples:
Unit 2 Worksheet C
A. Circle the correct answer, complete the dialogue below.
Herman : | Oh no, I cannot get the top off this bottle! |
Mary : | This is because yours hands are (1) dry, oily as you have just eaten. |
Herman : | Is there any problem with that? |
Mary : | This will cause the (2) friction, force between your fingers and the top of the bottle to become (3)smaller, bigger. |
Herman : | Then, what should I do? |
Mary : | Clean and (4)warm, dry your hands first so that you can apply a (5)smaller, bigger force and open the top more easily, |
Herman : | Thanks for your advice. |
Mary : | You are welcome. |
B. State whether the following statements are true or false.
1. A force is needed to do work. | ||
2. A goalkeeper exerts an opposing force on the ball when he catches it. | ||
3. Force can make a stationary objects moves but cannot make a moving object stops. | ||
4. The rougher the surface, the further the moving object can travel. | ||
5. Friction is always useful in our everyday life. | ||
6. A spring becomes shorter when compressed due to friction. |
Friction
Friction is the force between two objects in contact with each other. It causes moving objects to slow down. It is a resistive force. It results from contact between the surfaces of the objects.
Effects of a Force
Force can
ì move a stationary object.
ì can faster, slow down or stop a moving object
ìchange the direction of a moving object
Unit 2 Worksheet B
Force
A. Write ‘Push’ , ‘Pull’ or ‘Push and Pull’ for each activity shown in the pictures below.
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