Question

A ball with a weight of 1.5N is thrown at an angle of 30o above the horizontal with an
initial speed of 12m/s. At its highest point, the net force on the ball is:

A. 9.8N, 30o below horizontal
B. zero
C. 9.8N, up
D. 9.8N, down
E. 1.5N, down

Answer 1

Answer on Question #40930, Physics, Mechanics | Kinematics | Dynamics

A ball with a weight of 1.5N is thrown at an angle of 30° above the horizontal with an initial speed of 12m/s. At its highest point, the net force on the ball is:

A. 9.8N, 30° below horizontal

B. zero

C. 9.8N, up

D. 9.8N, down

E. 1.5N, down

Solution:

Neglecting air resistance, the only force on a ball is the force of gravity (weight). The weight of the ball doesn't change in this example, so the force diagram is the same for every image. One of the most common mistakes students make is to think that some sideways force must be required. No! An object in motion tends to stay in motion according to Newton's first law.

The weight is

$$W = 1.5 \mathrm{N}$$

Answer. E. 1.5N, down

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