AQA A-level physics-mechanics

What is the approximate average kinetic energy of a cyclist in a race

• 10J

• 10kJ

• 10MJ

• 10TJ

Mechanical Power

• is a vector quantity.

• is measured in J.

• has base units of kg m² s⁻³.

• can be calculated from force × distance moved.

A vehicle travels on a straight road, starting at time t = 0

The graph shows how its velocity varies with time.

What is the distance of the vehicle from its start position when t = 40 s?

• 115m

• 190m

• 260m

• 370m

• The acceleration of X is less than that of Y.

• The acceleration of X is greater than that of Z.

• The acceleration of X is the same as that of Y.

• The acceleration of Y is less than that of Z.

A stationary ball is free to move. The ball is hit with a bat.

The graph shows how the force of the bat on the ball changes with time.

The ball has a mass of 0.044 kg.

What is the speed of the ball immediately after being hit?

• 13 m s⁻¹

• 60 m s⁻¹

• 80 m s⁻¹

• 160 m s⁻¹

A suitcase weighing 200 N is placed on a weighing scale in a lift.

The scale reads 180 N when the lift is moving.

The lift is

• moving down at a constant velocity.

• moving down with a decreasing velocity.

• moving up at a constant velocity.

• moving up with a decreasing velocity.

An object of mass m is accelerated from rest to a velocity v by a constant resultant force F.

What is the work done on the object during this acceleration?

• Fv

What is true for an inelastic collision between two isolated objects?

• Both total momentum and total kinetic energy are conserved

• Neither total momentum nor total kinetic energy is conserved

• Only total kinetic energy is conserved.

• Only total momentum is conserved.

A parachutist descends to the ground at a constant speed with the parachute open.

 

Which force, together with the parachutist’s weight, makes a pair according to Newton’s third law of motion?

• the drag force on the parachutist from the air

• the tension in the strings of the parachute

• the gravitational force of the parachutist on the Earth

• the lift force on the parachute from the air

A tennis ball has a mass of 58 g.

The ball is dropped from rest from a height of 1.8 m above the ground and falls vertically.

The ball rebounds vertically to a height of 1.1 m.

The effect of air resistance is negligible.

What is the change in momentum of the ball during its collision with the ground?

• 0.040 N s

• 0.075 N s

• 0.215 N s

• 0.614 N s