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Speeding up
Speed, and all that.
| Question | Answer |
|---|---|
| How do you measure speed? Name at least 3. | (the speedometer- in cars) (the speed trap gun - the gun is fired at an approaching vehicle a beam of radio waves travels to it through the air. it reflects and returns to a recerive on the gun) (the stop watch) (light gates) |
| Why are light gates more reliable than stop watch? | light gates is a beam of light which is broken by an object passing through it, so the switch would than start an electronic stopwatch. but if you use a stop watch you may always start it or stop it too fast or too slow, the speed will not be accurate |
| If traveling at a higher speed, would the line be steeper or less steep? | steeper |
| What is velocity? | the speed and direction of movement when given together are called the velocity |
| How do you calculate the steady acceleration of an object? | ( acceleration = change in velocity/time) (metres per second squared) |
| What is the friction which exists between two objects when there is no movement? | static fction |
| If you are asked to push a heavy box across the floor. At first you need to push very hard but once the box has started to move u can push less strongly yet keep it moving. why? | because if the strength of the push or pull of the object is increased beyond this value, the object would start to slide |
| How can you reduce friction? How do you increase friction? | (placing liquid between 2 surface. oil between metal parts) (pressing surfaces together more strongly) |
| Why does oiling the axles of a biclycle move more easily? | It reduces friction and reduces wear on the metal parts |
| Explain air resistance. and the uses. | air resistance affects the speed. Cars are streamlined shaped for air resistance. the cars body is designed like a wedge to cut its way through the air and the surfaces are curved to allow the air to flow over the sides. It allows the car to move faster. |
| Explain water resistance. and the uses. | when an object moves through water it pushes the water out of the way and the water moves over the object's sides and pushes back on the object. The push on the object is called water resistance/drag |
| Explain the sky diving velocity in steps. | (1.diver's weight pulls them down. she falls,diver accelerates.(2.eventually the force of the air resistance will balance the force puling the diver down and she will fall steadily.(3 she open their parachute, the air resistance greatly increases. |
| Name at least one action reacting pair | the force when your leaning against the wall and the wall exerts a force on you |
| Explain balanced forces. | balanced forces act on one object only and causes you to move at a steady speed |
| Draw a submarine sinking in water. Draw and label the forces acting on it and indicate the strength of each one by the size of its arrow. | (blank) |
| How much is 1kg in Newtons? How do you calculate gravitational field strength? | (1kg = 10N) (gravitational field strength = weight/mass) |
Created by:
hamizah