Force and pressure Worksheet-15

Force and pressure Worksheet-15

21. Magnetic force makes the Earth move around the Sun.

22. Frictional force enables us to drive and walk.

23. Electrostatic, magnetic and gravitational forces are examples of non-contact force.

24. Pressure is defined as the force per unit volume.

25. The SI unit for pressure is pascal.

26. Newton/m2 is the unit for pressure.

27. Pressure increases with the increase in area over which the force is applied.

28. Pointed end of high heeled shoe exerts greater pressure than the flat end.

29. Liquids and gases together are called as fluids.

30. Atmospheric pressure is the pressure exerted on an object by the weight of air above it.

31. Flat and broad feet of camel increases the pressure exerted on sand.

32. The atmospheric pressure on the Earth’s surface at sea level is 100 kPa.

33. Barometer is used to measure atmospheric pressure.

34. The atmospheric pressure increases with the increase in altitude.

35. The pressure increases as one goes deeper in the sea.

36. Skis have small area to reduce the pressure on the snow.

Answer:

21. False

Explanation: Gravitational force makes the Earth move around the Sun.

22. True

23. True

24. False

Explanation: Pressure is defined as the force per unit area.

25. True

26. True

27. False

Explanation: Pressure increases with decrease in area over which the force is applied.

28. True

29. True

30. True

31. False

Explanation: Flat and broad feet of camel decreases the pressure exerted on sand.

32. True

33. True

34. False

Explanation: The atmospheric pressure decreases with the increase in altitude.

35. True

36. True