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This is the first of two workbooks full of challenging physics problems designed to help you prepare for the Oxford Physics Aptitude Test (PAT). The two workbooks contain many questions of varying difficulty and subject
Solution. Let nb, nr, ny and ng be the numbers of blue, red, yellow and green buttons respectively. Also let N = nb + nr + ny + ng be the total number of buttons. We need to convert the information given in the question into mathemat-ical statements.
Use the following formula to solve for weight: Weight (W) = Mass (m) x gravity (g) W = mg. Mass is measured in kilograms (kg) Gravity on earth is a constant: 9.8 m/s2 Weight is measured in Newton’s (1 N = 1 kg m/s2) Answer the following questions – show ALL WORK and UNITS. 1.
Mass is a measure of the amount of matter (stuff) in an object. It is measured in kilograms (kg) Weight is a force and it is the pull of gravity acting on an object. It is measured in Newtons. Collect a 20N spring balance and a set of 100 g masses. Predict the weight (force of gravity) on 100 g. Record this in the table.
A 5 kg block is pulled across a table by a horizontal force of 40 N with a frictional force of 8 N opposing the motion. Calculate the acceleration of the object.
How big a force is 1 N? If m = 1 kg, W = F grav = mg = (1 kg)(9.8 m/s 2) = 9.8 N. A kilogram mass has a weight of about 10 N, which is about 2.2 lbs. The pound (lb) is the English unit of force: 1 lb = 4.44 N. Example: Glider on an air track with v = constant OR book at rest on a table. In both cases, a = 0 F net = 0
The diagram shows a block, of mass 13 kg, on a rough horizontal surface. It is attached by a string that passes over a smooth peg to a sphere of mass 7 kg, as shown in the diagram.
