Forces and Newton's Laws test questions

1

What is the weight of a \(65kg\) person on the Earth?

\[63\cdot7\,N\]

\[637\,N\]

\[6370\,N\]

2

What is the weight of a \(65kg\) person on the moon where \(g=1.6\,Nkg^{-1}?\)

\[65\,N\]

\[104\,N\]

\[650\,N\]

3

What is the unbalanced force acting a on a rocket if its weight is \(25,000 N\) and the thrust of its engines is \(35,000N\)?

\[10,000N\]

\[25,000N\]

\[35,000N\]

4

The cyclist and bicycle have a combined mass of \(80kg\) and accelerate forwards at \(0.9\,m\,s^{-2}\). Calculate the size of the unbalanced force producing this acceleration.

Side-on view of cyclist with green arrow indicating direction of travel, right to left.

\[72N\]

\[80N\]

\[80.9N\]

5

Two forces act on a parachutist during a drop. One force is the weight \(W\) of the parachutist. The other force is the upwards pull \(P\) from the parachute harness on the parachutist. The parachutist has a mass of \(50kg\). What is the acceleration of the parachutist?

Parachutist falling to earth. A green force arrow points up labelled 'P - 400 N' and a purple force arrow points down labelled 'W - 500 N'.

\[100\,m\,s^{-2}\]

\[50\,m\,s^{-2}\]

\[1\cdot8\,m\,s^{-2}\]

6

A shopping trolley and its contents have a mass of \(20kg\). The trolley is pushed with a force \(P\). The friction force acting on the trolley is \(15\,N\). The acceleration of the trolley is \(0\cdot5\,m\,s^{-2}\) in the forward direction. What is the size of the unbalanced force acting on the trolley?

Side-on view of shopping trolley. A green force arrow points left labelled 20 N and a purple force arrow points right labelled P.

\[0\cdot5\,N\]

\[1\,N\]

\[10\,N\]

7

A shopping trolley and its contents have a mass of \(20kg\). The trolley is pushed with a force \(P\). The friction force acting on the trolley is \(15N\). The acceleration of the trolley is \(0\cdot5\,m\,s^{-2}\) in the forward direction. What is the size of force \(P\)?

\[10\,N\]

\[25\,N\]

\[40\,N\]

8

A \(20N\) force and a \(15N\) force act on a crate at right angles, as shown in the diagram.

Side-on view of a crate. A green force arrow points up labelled 20 N and a purple force arrow points right labelled 15 N.

What is the magnitude of the resultant force?

\[25\,N\]

\[35\,N\]

\[53\,N\]

9

A \(20N\) force and a \(15N\) force act on a crate at right angles, as shown in the diagram.

What is the direction of the resultant force?

\(38\cdot 9^{\circ}\) above the horizontal

\(45^{\circ}\)above the horizontal

\(53\cdot1^{\circ}\)above the horizontal