File 1
1. Resonance; asteroids has the tendency of oscillating in a system at greater frequencies and amplitude.
6. Mass is the physical quantity that measures inertia. An object with a larger mass has a tendency of resisting movement unless more force is exerted on it.
7. A 3kg piece of iron has more mass and a 2kg fluffy pillow has more volume. The piece of iron has more weight (3 kg) as compared to the pillow (2 kg), this make the iron to have more mass since mass = weight / gravitational force considering gravitational force is constant. The 2kg fluffy pillow has more volume because it occupies a bigger space than the 3kg piece of iron.
8. A dieting person loses more mass. Dieting makes a person fit hence prevent disorders such as obesity that usually increase the mass of the body.
10. My mass is 60 kg. Hence my weight = 600N. since weight = mass * gravitational force (g = 10 kg/N)
File 2
1. Handed to identical closed boxes, one filled with feathers and the other with sand; you can determine which has feathers or sand by lifting the two boxes. The box with sand has more mass hence heavier than the one with feathers.
2. When hitting a wall, a larger surface area of the hand is used as compared a small surface area of the hand that carries the weight of the load. The force of gravity pulls the load downwards hence exerting more pressure on the hand making it to hurt.
3. A massive clever has more weight as compared to a lighter knife thus the pressure it exert on the vegetable is more hence making it more effective when chopping vegetables.
6. Yes, equal force (action reaction forces). When you move upwards the force of gravity pulls the body downwards.
11. When you toss a coin upwards, its velocity decreases slightly while ascending. The velocity of the coin decreases because when the body is moving upwards it moves against the gravitational pull. Tossing a coin against the gravitational creates some resistances that reduce the velocity of the coin.
Acceleration = change in velocity / change in time
Therefore, as the velocity of the tossed coin reduces, its acceleration also reduces.
File 3
2. The airbags in the car are used to create impulse which reduces the momentum and inertia in the car to a zero value. Inertial is diminished to decrease the injuries.
3. The momentum of the car will be less due to reduction of the gravitational force hence, less velocity of a vehicle.
7. The bag that is used to stop the punches is soft and flexible hence more elapsed time that results into less average force. The opponent tends to more rigid hence creating less elapsed time that result to large force.
14. When a ball is rolled down the hill the law of momentum conservation is violated since the net momentum of the system does not remain constant.
17. When the momentum changes the law of momentum conservation is violated. This is because the internal forces of helicopter and Bronco are not equal and opposite hence changing in momentum.
File 4
1. The reading of the scale changes due to the change in the surface area. Thus, the scale reads the pressure.
4. The volume of human body changes due to the compression of the pressure of the surrounding water. As the volume of the object changes, the density of an object changes.
9. When a body is subjected in deep water it experiences more pressure than in shallow water. This is because pressure increases with depth due to the weight of the overlying water. Thus, when bathing in deep water, a person is hurt less by stones.
10. No. this is because the pressure difference creates a net force that will accelerate the object upwards.
12. It is no accurate to say light objects floats and heavy objects sinks because the buoyancy is not affected by mass only, but many factors such as density, depth of water and the shape. For instance, a ship floats and a needle sinks.
