1. A 1300-kg car moving at 20m/s hits the fence and comes to a stop in 2 s. what is the average forced acted to the car?
2. A lady tennis player hits an approaching ball with a force of 750 N. If she hits the ball in 0.002, how much impulse is imparted to the tennis ball?
Answers
Answer:
1.
Given:
Mass = 1300kg
Acceleration = 20m/s
Time = 2s
Force = ?
F = ma/2
F = 1300 x 20 ÷ 2
F = 26000 ÷ 2
F = 13000 N
∴ The average Force of the car is 13000N.
2.
Given:
F= 750N
t = 0.002s
Impulse =?
Impulse = Force × time
750 N×0.002 s = 1.5 Ns
∴ The impulse of the tennis ball is 1.5 Ns
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Concept
A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to define force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.
Given
- For question 1 a 1300-kg car moving at 20m/s hits the fence and comes to a stop in 2 s.
- For question 2 a lady tennis player hits an approaching ball with a force of 750 N. If she hits the ball in 0.002
Find
- For question 1 we have to find average forced acted to the car
- For question 2 we have to find impulse imparted to the tennis ball
Solution
For question 1:
- Given:
Mass = 1300kg
Acceleration = 20m/s
Time = 2s
Force = ?
F = ma/2
F = 1300 x 20 ÷ 2
F = 26000 ÷ 2
F = 13000 N
For question 2:
- Given:
F= 750N
t = 0.002s
Impulse =?
Impulse = Force × time
750 N×0.002 s = 1.5 Ns
Hence average forced acted to the car will be 13000 N and impulse imparted to the tennis ball will be 1.5 Ns
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