Straight Line Motion Flashcards
Out of a football, cricket ball, soccer ball and golf ball, which would have the greatest acceleration if hit with the same force?
Golf Ball
Why does a base jumper fall to earth slower with his parachute deployed?
The increased surface area of the parachute allows more air resistance to be generated at a lower speed, allowing a reduced terminal velocity
Does increased force between two surfaces reduce friction?
No, it does not reduce friction
Why do seat belts in cars help save lives?
They help the passenger come to a more gradual stop as the front compartment of the car crumples
When a parachutists is moving towards the earth at constant speed, what are the forces acting on the parachutist?
Both forces are equal in strength, but opposite in direction
What does Newton’s first law of inertia state?
An object will continue to move in a straight line or remain at rest unless the forces acting on it are unbalanced?
What is the inertia of an object most closely linked to?
Mass of an object
Why does a cyclist need to pedal harder to ride faster?
There is greater air resistance at higher speeds
What are the types of friction, from greatest to least?
Static, sliding and rolling
What can cause engines to wear?
Friction
Does it take more force to keep an object moving then to start it from rest?
No, it takes more force to start an object from rest
What is Newton’s first law of motion best described as?
A body will travel at constant velocity unless acted on by an unbalanced force
Does a car stop quicker on a surface with a low coefficient of friction?
No, a car stops quicker on a surface with a high coefficient of friction
A passenger is sitting in a stationary car facing North. If the car is struck from behind, in which direction does she experience a net force acting horizontally?
North
What are the effects of friction?
Produces heat, opposes and slows down motion and causes objects to wear
