P.3.4.1.3 Motion along a straight line

A girl is bouncing on a trampoline.

Assuming that air resistance is negligible, her acceleration

• is zero when she is at maximum height.

• is constant when she is in the air.

• changes direction as she rises and then falls.

• is maximum just before she lands on the trampoline.

Answer explanation

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P.3.1.4.3 Motion along a straight line

An aircraft is flying due north through still air with a speed v.

The aircraft enters a region where the wind is blowing with a speed u from a direction which makes an angle of θ with due south.

What is the time taken for the aircraft to fly a distance D due north of its current position in this windy region?

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A mass of 2.5 kg is released from rest at X and slides down a ramp, of height 3.0 m, to point Y as shown.

When the mass reaches Y at the bottom of the ramp it has a velocity of 5.0 m s^–1.

What is the average frictional force between the mass and the ramp?

• 8.5 N

• 10.6 N

• 14.7 N

• 24.5 N

Which row gives two features of graphs that provide the same information?

• A

• B

• C

• D

Which graph best represents the velocity–time graph for a ball that is dropped from rest and bounces repeatedly?

• A

• B

• C

• D

Answer explanation

The ball's vertical velocity changes directions, so its velocity must be negative half of the time.

A body travels with speed v, which varies with time t as shown in the graph.

Which one of the graphs shows how the distance s covered by the body varies with time t?

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A firework is fired vertically up into the air and subsequently falls to the ground.

Which quantity relating to the motion of the rocket is never zero before it hits the ground? Assume that air resistance is negligible.

• acceleration

• velocity

• momentum

• kinetic energy

An object is accelerated from rest by a constant force F for a time t. Which graphs represent the variation of time with the change in the kinetic energy and the change in momentum of the object?

• A

• B

• C

• D

An object is dropped from a cliff. How far does the object fall in the third second?

Assume that g = 10 m s^–2.

• 10 m

• 20 m

• 25 m

• 45 m

A car accelerates uniformly from rest along a straight road. Which graph shows the variation of displacement x of the car with time t?

• A

• B

• C

• D