Force
What is a force?
A push or a pull exerted on an object
Define motion relative to a reference point.
An object's change in position
The first person to study gravity was an English scientist named __________.
Issac Newton
What is Friction?
A force that resists the motion between two objects or surfaces
What is acceleration?
Rate of change of velocity
What is the SI unit for force?
Newtons (N)
The difference between speed and velocity, is that velocity includes ____________.
Direction
As the distance between two objects increases the pull of gravity
Decreases
Friction is a force that acts in an ___________ direction of movement.
Opposite
Which one of Newton's laws states that an object at rest will stay at rest and an object in motion will stay in motion until acted on by an outside force?
Newton's 1st Law
What happens when the forces acting on an object are unbalanced?
The object's motion can change
Describe the relationship between net force and motion.
A net force can change an object's motion
What is weight?
Pull of gravity on mass
Give one example of friction in everyday life.
Brakes stopping a bike, shoes gripping the ground, or rubbing hands together.
What is the formula for Newton's 2nd Law? (Hint: Force)
F= m x a
Force= mass x acceleration
A student pushes a box to the right with 20 N of force. Another student pushes the box to the left with 5 N of force. What is the net force?
15N to the right
What is the formula for calculating speed?
Distance/Time
Gravity is a _____ that _____ 2 objects towards one another.
Force & Pulls
Why do car tires have grooves or tread?
To increase friction and improve the car's grip on the road.
Newton’s Second Law explains that an object’s acceleration is affected by which two factors?
Force & Mass
A wagon is pulled with 40 N of force to the right. A second force of 10 N also pulls to the right. What is the net force?
50N to the right
Mark drives to his friend's house 200 miles away in 4 hours. What is Mark's speed?
50 miles/hour
What two factors affect an object's gravity?
Mass & Distance
What is the air resistance?
Pushing force that slows down objects as they move through the air (air friction)
A student jumps off a small boat onto a dock. The boat moves backward as the student moves forward. Which law explains this?
Newton's 3rd Law