HS10A Revision Questions

A stone is thrown vertically upwards from a point that is 12m above the sea. It then falls into the sea below after 3.4 s. Air resistance is negligible.

At which speed was the stone released when it was thrown?

• 3.5 m s^-1

• 6.6 m s^-1

• 13 m s^-1

• 20 m s^-1

In the absence of air resistance, a ball thrown horizontally from a tower with velocity v, will land after time T seconds.

If, however, air resistance is taken into account, which statement is correct?

• The ball lands with a horizontal velocity less than v after more than T seconds.

• The ball lands with a horizontal velocity less than v after T seconds.

• The ball lands with a horizontal velocity v after more than T seconds.

• The ball lands with a horizontal velocity v after T seconds.

A ball falls through a liquid at a constant speed. It is acted upon by three forces: an upthrust, a drag-force and its weight.

Which statement is correct?

• The drag-force increases with increasing depth.

• The drag-force is equal to the sum of the upthrust and weight.

• The upthrust is constant with increasing depth.

• The weight is greater than the sum of the drag-force and the upthrust.

A body is released from rest and falls vertically in air of constant density.

Which statement about the motion of the falling body is correct?

• As it accelerates, its weight decreases so that its acceleration decreases until it travels with constant velocity.

• It accelerates initially at 9.8 m s^-2 but the drag force increases so its acceleration decreases.

• Its velocity increases at a constant rate until its velocity becomes constant.

• The drag force of the air increases continually and eventually the velocity decreases.

A car of mass 750 kg has a horizontal driving force of 2.0 kN acting on it. It has a forward horizontal acceleration of 2.0 m s^-2.

What is the resistive force acting horizontally?

• 0.50 kN

• 1.5 kN

• 2.0 kN

• 3.5 kN

A ball is kicked upwards at an angle of 45° to horizontal ground. After a short flight, the ball returns to the ground. It may be assumed that air resistance is negligible.

What is never zero during the flight of the ball?

• the horizontal component of the ball’s acceleration

• the horizontal component of the ball’s velocity

• the vertical component of the ball’s momentum

• the vertical component of the ball’s velocity

The velocity–time graphs of four different objects are shown.

Which graph represents an object falling from rest through a long distance in the Earth’s atmosphere?

• 
• 
• 
• 

A ball is kicked so that it has an initial velocity of 12 m s^-1 at an angle of 50⁰ to horizontal ground. Assume that air resistance is negligible.

What is the maximum height above the ground that is reached by the ball?

• 0.47 m

• 3.0 m

• 4.3 m

• 7.3 m

A box rests on the Earth, as shown. Newton’s third law describes how forces of the same type act in pairs. One of the forces of a pair is the weight W of the box.

Which arrow represents the other force of this pair?

• A

• B

• C

• D

Which statement describes the mass of an object?

• the force the object experiences due to gravity

• the momentum of the object before a collision

• the resistance of the object to changes in motion

• the weight of the object as measured by a balance