DFV 20143 PHYSICS Test 1 JJ2024

Define a physical quantity?

Identify either the following statements are scalar or vector quantities:

a) Wind blowing at 20 mph

• Vector

• Scalar

Identify either the following statements are scalar or vector quantities:

a) 120N along the positive x-axis,

• Vector

• Scalar

Identify either the following statements are scalar or vector quantities:

a) Temperature 18 degree Celsius,

• Vector

• Scalar

Identify either the following statements are scalar or vector quantities:

a) A car moving 20m/s due west.

• Vector

• Scalar

Determine a dimension (Dimensional Analysis) and the S.I. unit for the following: Force (which mass and acceleration), Density (which mass per unit volume), Pressure (which force per unit area).

Vernier caliper is used to measure the diameter of a sphere. The measurement diameter of the sphere is 18.82cm. While the actual diameter of the sphere is 19cm. Calculate: Absolute error, Percentage error, Relative accuracy, Percentage accuracy.

Define the two-dimensional motion?

Figure 1 shows the Velocity vs Time graph along 10 second car journey. Compute: The acceleration within period 5s to 8s, Total distance travelled.

Figure 2 shows a ball rolls off the top of a 1.5 m tall table with a horizontal velocity of 2.0 ms-1. Compute: The time taken for the ball to hit the floor, The vertical component of the final velocity ball hits the floor, How far the ball will travel from the table before it hits the floor.