Flashcards
Forces
Cards in this deck (14)
- 1What can forces do?Make a still object move
Make an object speed up
Make an object slow down
Make an object stop
Make an object change direction
Make an object change shape - 2Friction is ...A contact force which occurs between two moving objects. When we rub our hands together there is friction. Friction makes heat or noise. It can be a help or a hindrance. We can reduce friction by using lubricants like oil or grease. This is Lubrication.
- 3Formula for density is ...
- 4Density of water is ...1g/cm cubed
- 5What are balanced and unbalanced forces?We say a force is balanced when there is no overall force acting on it.
- 6What is the formula for speed?
- 7What is the stopping distance made up of?The thinking distance and the braking distance.
- 8What is the thinking distance?The time in-between the driver seeing an obstacle and hitting the brakes.
- 9What is the braking distance?The time in-between hitting the brakes and coming to a halt.
- 10Describe when the object goes slowly, goes quickly and stops.The object goes quickly from A-B. Stops from B-C. Goes slowly from C-D.
- 11What does gravity do?It pulls you down.
- 12Where does gravity differ?In the size of planets. The smaller, the less gravity.
- 13What unit are forces measured in?Newtons (N)
- 14How are they measure in a classroom?With a Forcemeter
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