ATPHY12 Motion Review

How far can a mother push a 17.0 kg baby carriage with a baby of 3 kg, using a force of 62 N, at an angle of 30º to the horizontal, if she can only do 2920 J of work?

• s = 34.4 m

• s = 44.4 m

• s = 54.4 m

• s = 64.4 m

A person carries a box weighing 19.6 N up a 10 m flight of stairs. Calculate the work done against the gravity on the box.

• 19.6 J

• 98.0 J

• 196.0 J

• 169.7 J

A force of 900 N acts on a car with mass 1 t over a distance of 0.5 km. What is the final speed if the car was initially at rest? (ignore friction)

• 25 ms^-1

• 30 ms^-1

• 30 ms^-1

• 35 ms^-1

A force of 30 N to the right is applied to a 2.0 kg block. A frictional force of 20 N opposes the motion. What is the acceleration of the block?

• -10.0 ms^-2

• -5.0 ms^-2

• 5.0 ms^-2

• 10.0 ms^-2

A car with a mass of 1 t is travelling at a speed of 20 ms^-1. Calculate the average net force applied to the car if it is to stop in a distance of 25 m.

• 8000 N

• 4000 N

• -4000 N

• -8000 N

A plane with a mass of 8 t accelerates from rest to take-off speed of 75 ms^-1 in 25 seconds. What is the average net force on the aeroplane during this time?

• 2.4 x 10⁵ N

• -2.4 x 10⁵ N

• 4.8 x 10⁵ N

• -4.8 x 10⁵ N

A jogger runs from a position that is 2.0 km North of the start. later, the jogger is at a position 5.0 km West of the start. What is the change in position?

• s = 3.4 km, W18^oS

• s = 4.4 km, W20^oS

• s = 5.4 km, W22^oS

• s = 6.4 km, W24^oS

With respect to the image: find the average speed the object travelled and how long does it take for the object to travel 70 cm?

• 9.7 ms^-1 and 23 s

• 12.3 ms^-1 and 13 s

• 20.5 ms^-1 and 6 s

• 7.9 ms^-1 and 12 s

A watch falls from the Sydney Harbour Bridge for 2.5 s before it hits a car below. With what velocity does the watch hit the car and how far did the watch fall?

• 24.5 ms^-1 vertically down and s= 31 m

• 14.5 ms^-1 vertically down and s= 28 m

• 14.5 ms^-1 vertically down and s= 31 m

• 24.5 ms^-1 vertically down and s= 28 m

An arrow is fired vertically upwards with an initial speed of 18.8 ms^-1. It lands next to where it was launched. For how long will the arrow remain in flight, and what is its maximum height?

• 4.8 s and 27 m

• 2.8 s and 9 m

• 3.8 s and 18 m

• 6.8 s and 36 m