Projectile motion

The diagram below shows the path of a projectile in the absence of air resistance.

Which one of the graphs at right best represents the path of the projectile under the same initial conditions when the air resistance is taken into account. (The path in the absence of air resistance is shown for comparison as a dotted line).

Answer

A projectile is launched horizontally from a high tower.

Which one of the graphs at right best represents the vertical component of the projectile's velocity from the time it is launched to the time it hits the ground?

Assume negligible air resistance.

Answer

An iron cannon ball is projected horizontally from a cliff and lands on the ground below, a certain distance from the base of the cliff.

Air resistance is negligible.

If a more massive iron ball were to be projected at the same speed....

a ... it would land at the same place.

b ... it would land closer to the cliff.

c ... it would land further away.

d ... it would land either further away or closer to the cliff depending on the height of the cliff and the speed of projection.

Answer

A stone is thrown vertically upwards and then returns to the ground.

When the stone is at the top of its path, the acceleration is....

a ... zero.

b... upwards.

c... downwards.

d... changes direction from upwards to downwards.

Amswer

When a cricket ball is thrown a short distance, which one of the following quantities remains constant throughout its flight?

a Potential energy.

b Momentum.

c Kinetic energy.

d Acceleration.

Answer

A projectile is fired at an angle to the vertical. Three characteristics of its subsequent motion are....

I ... the horizontal component of velocity.

II ... the vertical component of velocity.

III ... the acceleration.

Neglecting air resistance, which characteristic(s) change(s) whilst the ball is in the air?

a ... I only.

b ... II only.

c ... II and III only.

d ... I and II only.

Answer