PHYSICAL SCIENCES – GRADE 11 PAPER 1 – PHYSICS WORKED EXAMPLES – NEWTON’S LAWS OF MOTION SECTION A 1. A man is driving his car at 120 km/hr on a rural road. He crashes into a 3 ton cow and is thrown through the windscreen. Use Newton’s laws to explain why. 2. A box at the back of a van moves backwards when the van moves forward. Use Newton’s laws to explain why. 3. A table is set with fancy food and dishes on a tablecloth. If Irshaad pulls rapidly on the tablecloth, use Newton’s laws to decide if the dishes will break 4. A beaded string (tasbeeh) hangs from the mirror of a car that is travelling north at 140 km/hr. The car suddenly turns east. Use Newton’s laws to determine in which direction the beaded string would move, from the perspective of the driver. 5. Two strings, P and Q, are tied together as shown below. Jabu tugs at string Q. Use Newton’s laws to determine at what point the break will happen. Assume strings P and Q cannot stretch and have the same length. P Knot Force Q
