DEMO. You have a heavy medicine ball. You throw it off the back of the cart. What do you think will happen? Why do you think this will happen?. AFTER DEMO. What has the greater force acting on it - you or the ball? Who has the greater acceleration you or the ball? Why?
The crew team uses Newton's third law of motion to move its boat. When an oar is put into the water, the water exerts an equal force on both sides of the oars, the surface of the flat side of the oars pushes against the water. The water pushes back on the oars with an equal and opposite force. The boat moves in the opposite direction of the oars with a force that is equal to that of the oars as they push against the water. The boat moves because the forces against it are unbalanced.
The force on a bullet and the force on the gun is same when the gun is fired, yet the bullet and the gun have very different accelerations? Why is this?
Remember Force = mass x acceleration
Force gun= Force bullet
Mgunx Agun = Mbullet x Abullet
The bullet has a much greater acceleration due to its small mass/inertia
Q – Why aren’t bullets as massive as guns?
Q- What would happen if you fired a gun on a skateboard?
A rocket is a reaction engine! Rocket pushes gas out and gas pushes rocket
Do rockets require air to accelerate?